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; 725ccf9203STyler Hicks 735ccf9203STyler Hicks if (S_ISLNK(inode->i_mode)) 745ccf9203STyler Hicks inode->i_op = &ecryptfs_symlink_iops; 755ccf9203STyler Hicks else if (S_ISDIR(inode->i_mode)) 765ccf9203STyler Hicks inode->i_op = &ecryptfs_dir_iops; 775ccf9203STyler Hicks else 785ccf9203STyler Hicks inode->i_op = &ecryptfs_main_iops; 795ccf9203STyler Hicks 805ccf9203STyler Hicks if (S_ISDIR(inode->i_mode)) 815ccf9203STyler Hicks inode->i_fop = &ecryptfs_dir_fops; 825ccf9203STyler Hicks else if (special_file(inode->i_mode)) 835ccf9203STyler Hicks init_special_inode(inode, inode->i_mode, inode->i_rdev); 845ccf9203STyler Hicks else 855ccf9203STyler Hicks inode->i_fop = &ecryptfs_main_fops; 865ccf9203STyler Hicks 87c4f79073STyler Hicks return 0; 88c4f79073STyler Hicks } 89c4f79073STyler Hicks 905ccf9203STyler Hicks static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, 915ccf9203STyler Hicks struct super_block *sb) 925ccf9203STyler Hicks { 935ccf9203STyler Hicks struct inode *inode; 945ccf9203STyler Hicks 955ccf9203STyler Hicks if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) 965ccf9203STyler Hicks return ERR_PTR(-EXDEV); 975ccf9203STyler Hicks if (!igrab(lower_inode)) 985ccf9203STyler Hicks return ERR_PTR(-ESTALE); 995ccf9203STyler Hicks inode = iget5_locked(sb, (unsigned long)lower_inode, 1005ccf9203STyler Hicks ecryptfs_inode_test, ecryptfs_inode_set, 1015ccf9203STyler Hicks lower_inode); 1025ccf9203STyler Hicks if (!inode) { 1035ccf9203STyler Hicks iput(lower_inode); 1045ccf9203STyler Hicks return ERR_PTR(-EACCES); 1055ccf9203STyler Hicks } 1065ccf9203STyler Hicks if (!(inode->i_state & I_NEW)) 1075ccf9203STyler Hicks iput(lower_inode); 1085ccf9203STyler Hicks 1095ccf9203STyler Hicks return inode; 1105ccf9203STyler Hicks } 1115ccf9203STyler Hicks 112c4f79073STyler Hicks struct inode *ecryptfs_get_inode(struct inode *lower_inode, 113c4f79073STyler Hicks struct super_block *sb) 114c4f79073STyler Hicks { 1155ccf9203STyler Hicks struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); 116c4f79073STyler Hicks 1175ccf9203STyler Hicks if (!IS_ERR(inode) && (inode->i_state & I_NEW)) 118c4f79073STyler Hicks unlock_new_inode(inode); 1195ccf9203STyler Hicks 120c4f79073STyler Hicks return inode; 121c4f79073STyler Hicks } 122c4f79073STyler Hicks 123c4f79073STyler Hicks /** 124c4f79073STyler Hicks * ecryptfs_interpose 125c4f79073STyler Hicks * @lower_dentry: Existing dentry in the lower filesystem 126c4f79073STyler Hicks * @dentry: ecryptfs' dentry 127c4f79073STyler Hicks * @sb: ecryptfs's super_block 128c4f79073STyler Hicks * 129c4f79073STyler Hicks * Interposes upper and lower dentries. 130c4f79073STyler Hicks * 131c4f79073STyler Hicks * Returns zero on success; non-zero otherwise 132c4f79073STyler Hicks */ 133c4f79073STyler Hicks static int ecryptfs_interpose(struct dentry *lower_dentry, 1345ccf9203STyler Hicks struct dentry *dentry, struct super_block *sb) 135c4f79073STyler Hicks { 1365ccf9203STyler Hicks struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb); 1375ccf9203STyler Hicks 138c4f79073STyler Hicks if (IS_ERR(inode)) 139c4f79073STyler Hicks return PTR_ERR(inode); 140c4f79073STyler Hicks d_instantiate(dentry, inode); 1415ccf9203STyler Hicks 142c4f79073STyler Hicks return 0; 143c4f79073STyler Hicks } 144c4f79073STyler Hicks 145237fead6SMichael Halcrow /** 146237fead6SMichael Halcrow * ecryptfs_create_underlying_file 147237fead6SMichael Halcrow * @lower_dir_inode: inode of the parent in the lower fs of the new file 148f70f582fSQinghuang Feng * @dentry: New file's dentry 149237fead6SMichael Halcrow * @mode: The mode of the new file 150237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 151237fead6SMichael Halcrow * 152237fead6SMichael Halcrow * Creates the file in the lower file system. 153237fead6SMichael Halcrow * 154237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 155237fead6SMichael Halcrow */ 156237fead6SMichael Halcrow static int 157237fead6SMichael Halcrow ecryptfs_create_underlying_file(struct inode *lower_dir_inode, 158237fead6SMichael Halcrow struct dentry *dentry, int mode, 159237fead6SMichael Halcrow struct nameidata *nd) 160237fead6SMichael Halcrow { 161237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 162237fead6SMichael Halcrow struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); 163237fead6SMichael Halcrow struct dentry *dentry_save; 164237fead6SMichael Halcrow struct vfsmount *vfsmount_save; 1652e21b3f1STyler Hicks unsigned int flags_save; 166237fead6SMichael Halcrow int rc; 167237fead6SMichael Halcrow 16870b89021STyler Hicks if (nd) { 1694ac91378SJan Blunck dentry_save = nd->path.dentry; 1704ac91378SJan Blunck vfsmount_save = nd->path.mnt; 1712e21b3f1STyler Hicks flags_save = nd->flags; 1724ac91378SJan Blunck nd->path.dentry = lower_dentry; 1734ac91378SJan Blunck nd->path.mnt = lower_mnt; 1742e21b3f1STyler Hicks nd->flags &= ~LOOKUP_OPEN; 17570b89021STyler Hicks } 176237fead6SMichael Halcrow rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); 17770b89021STyler Hicks if (nd) { 1784ac91378SJan Blunck nd->path.dentry = dentry_save; 1794ac91378SJan Blunck nd->path.mnt = vfsmount_save; 1802e21b3f1STyler Hicks nd->flags = flags_save; 18170b89021STyler Hicks } 182237fead6SMichael Halcrow return rc; 183237fead6SMichael Halcrow } 184237fead6SMichael Halcrow 185237fead6SMichael Halcrow /** 186237fead6SMichael Halcrow * ecryptfs_do_create 187237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 188237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 189237fead6SMichael Halcrow * @mode: The mode of the new file 190237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 191237fead6SMichael Halcrow * 192237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 193237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 194237fead6SMichael Halcrow * stat of the lower directory inode. 195237fead6SMichael Halcrow * 196237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 197237fead6SMichael Halcrow */ 198237fead6SMichael Halcrow static int 199237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 200237fead6SMichael Halcrow struct dentry *ecryptfs_dentry, int mode, 201237fead6SMichael Halcrow struct nameidata *nd) 202237fead6SMichael Halcrow { 203237fead6SMichael Halcrow int rc; 204237fead6SMichael Halcrow struct dentry *lower_dentry; 205237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 206237fead6SMichael Halcrow 207237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 208237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 209801678c5SHirofumi Nakagawa if (IS_ERR(lower_dir_dentry)) { 210237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error locking directory of " 211237fead6SMichael Halcrow "dentry\n"); 212237fead6SMichael Halcrow rc = PTR_ERR(lower_dir_dentry); 213237fead6SMichael Halcrow goto out; 214237fead6SMichael Halcrow } 215237fead6SMichael Halcrow rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, 216237fead6SMichael Halcrow ecryptfs_dentry, mode, nd); 2174981e081SMichael Halcrow if (rc) { 218caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 21918d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 220237fead6SMichael Halcrow goto out_lock; 221237fead6SMichael Halcrow } 222237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 2235ccf9203STyler Hicks directory_inode->i_sb); 224237fead6SMichael Halcrow if (rc) { 225237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); 226237fead6SMichael Halcrow goto out_lock; 227237fead6SMichael Halcrow } 2280cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); 2290cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); 230237fead6SMichael Halcrow out_lock: 231237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 232237fead6SMichael Halcrow out: 233237fead6SMichael Halcrow return rc; 234237fead6SMichael Halcrow } 235237fead6SMichael Halcrow 236237fead6SMichael Halcrow /** 237237fead6SMichael Halcrow * ecryptfs_initialize_file 238237fead6SMichael Halcrow * 239237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 240237fead6SMichael Halcrow * file with a header and first data page. 241237fead6SMichael Halcrow * 242237fead6SMichael Halcrow * Returns zero on success 243237fead6SMichael Halcrow */ 244237fead6SMichael Halcrow static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) 245237fead6SMichael Halcrow { 246d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 247d7cdc5feSMichael Halcrow &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; 248237fead6SMichael Halcrow int rc = 0; 249237fead6SMichael Halcrow 250237fead6SMichael Halcrow if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { 251237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 252e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 253d7cdc5feSMichael Halcrow goto out; 254237fead6SMichael Halcrow } 255237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 256237fead6SMichael Halcrow rc = ecryptfs_new_file_context(ecryptfs_dentry); 257237fead6SMichael Halcrow if (rc) { 258d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 259d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 260d7cdc5feSMichael Halcrow goto out; 261237fead6SMichael Halcrow } 2623b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, 2633b06b3ebSTyler Hicks ecryptfs_dentry->d_inode); 264391b52f9SMichael Halcrow if (rc) { 265391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 266332ab16fSTyler Hicks "the lower file for the dentry with name " 267391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 268391b52f9SMichael Halcrow ecryptfs_dentry->d_name.name, rc); 269391b52f9SMichael Halcrow goto out; 270391b52f9SMichael Halcrow } 271d7cdc5feSMichael Halcrow rc = ecryptfs_write_metadata(ecryptfs_dentry); 272332ab16fSTyler Hicks if (rc) 273d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 274332ab16fSTyler Hicks ecryptfs_put_lower_file(ecryptfs_dentry->d_inode); 275237fead6SMichael Halcrow out: 276237fead6SMichael Halcrow return rc; 277237fead6SMichael Halcrow } 278237fead6SMichael Halcrow 279237fead6SMichael Halcrow /** 280237fead6SMichael Halcrow * ecryptfs_create 281237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 282237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 283237fead6SMichael Halcrow * @mode: The mode of the new file. 284237fead6SMichael Halcrow * @nd: nameidata 285237fead6SMichael Halcrow * 286237fead6SMichael Halcrow * Creates a new file. 287237fead6SMichael Halcrow * 288237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 289237fead6SMichael Halcrow */ 290237fead6SMichael Halcrow static int 291237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 292237fead6SMichael Halcrow int mode, struct nameidata *nd) 293237fead6SMichael Halcrow { 294237fead6SMichael Halcrow int rc; 295237fead6SMichael Halcrow 296addd65adSMichael Halcrow /* ecryptfs_do_create() calls ecryptfs_interpose() */ 297237fead6SMichael Halcrow rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); 298237fead6SMichael Halcrow if (unlikely(rc)) { 299237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 300237fead6SMichael Halcrow "lower filesystem\n"); 301237fead6SMichael Halcrow goto out; 302237fead6SMichael Halcrow } 303237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 304237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 305237fead6SMichael Halcrow rc = ecryptfs_initialize_file(ecryptfs_dentry); 306237fead6SMichael Halcrow out: 307237fead6SMichael Halcrow return rc; 308237fead6SMichael Halcrow } 309237fead6SMichael Halcrow 310778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 311237fead6SMichael Halcrow { 3122aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 313778aeb42STyler Hicks int rc; 314237fead6SMichael Halcrow 315778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 316391b52f9SMichael Halcrow if (rc) { 317391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 318332ab16fSTyler Hicks "the lower file for the dentry with name " 319391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 320778aeb42STyler Hicks dentry->d_name.name, rc); 321778aeb42STyler Hicks return rc; 322391b52f9SMichael Halcrow } 323778aeb42STyler Hicks 3243b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 3252aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3262aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3272aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 328778aeb42STyler Hicks 329778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 330778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 331237fead6SMichael Halcrow if (rc) { 332778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 333778aeb42STyler Hicks if (!rc) 334dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 335dd2a3b7aSMichael Halcrow } 336778aeb42STyler Hicks 337778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 338778aeb42STyler Hicks return 0; 339778aeb42STyler Hicks } 340778aeb42STyler Hicks 341778aeb42STyler Hicks /** 342778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 343778aeb42STyler Hicks */ 344778aeb42STyler Hicks static int ecryptfs_lookup_interpose(struct dentry *dentry, 345778aeb42STyler Hicks struct dentry *lower_dentry, 346778aeb42STyler Hicks struct inode *dir_inode) 347778aeb42STyler Hicks { 348778aeb42STyler Hicks struct inode *inode, *lower_inode = lower_dentry->d_inode; 349778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 350778aeb42STyler Hicks struct vfsmount *lower_mnt; 351778aeb42STyler Hicks int rc = 0; 352778aeb42STyler Hicks 353778aeb42STyler Hicks lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 354778aeb42STyler Hicks fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode); 355778aeb42STyler Hicks BUG_ON(!lower_dentry->d_count); 356778aeb42STyler Hicks 357778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 358778aeb42STyler Hicks ecryptfs_set_dentry_private(dentry, dentry_info); 359778aeb42STyler Hicks if (!dentry_info) { 360778aeb42STyler Hicks printk(KERN_ERR "%s: Out of memory whilst attempting " 361778aeb42STyler Hicks "to allocate ecryptfs_dentry_info struct\n", 362778aeb42STyler Hicks __func__); 363237fead6SMichael Halcrow dput(lower_dentry); 36431f73beeSLino Sanfilippo mntput(lower_mnt); 365778aeb42STyler Hicks d_drop(dentry); 366778aeb42STyler Hicks return -ENOMEM; 367778aeb42STyler Hicks } 368778aeb42STyler Hicks ecryptfs_set_dentry_lower(dentry, lower_dentry); 369778aeb42STyler Hicks ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); 370778aeb42STyler Hicks 371778aeb42STyler Hicks if (!lower_dentry->d_inode) { 372778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 373778aeb42STyler Hicks d_add(dentry, NULL); 374778aeb42STyler Hicks return 0; 375778aeb42STyler Hicks } 376778aeb42STyler Hicks inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); 377778aeb42STyler Hicks if (IS_ERR(inode)) { 378778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 379778aeb42STyler Hicks __func__, PTR_ERR(inode)); 380778aeb42STyler Hicks return PTR_ERR(inode); 381778aeb42STyler Hicks } 382778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 383778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 384778aeb42STyler Hicks if (rc) { 385778aeb42STyler Hicks make_bad_inode(inode); 386778aeb42STyler Hicks return rc; 387778aeb42STyler Hicks } 388778aeb42STyler Hicks } 389778aeb42STyler Hicks 390778aeb42STyler Hicks if (inode->i_state & I_NEW) 391778aeb42STyler Hicks unlock_new_inode(inode); 392778aeb42STyler Hicks d_add(dentry, inode); 393778aeb42STyler Hicks 394addd65adSMichael Halcrow return rc; 395addd65adSMichael Halcrow } 396addd65adSMichael Halcrow 397addd65adSMichael Halcrow /** 398addd65adSMichael Halcrow * ecryptfs_lookup 399addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 400addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 401addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 402addd65adSMichael Halcrow * 403addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 404addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 405addd65adSMichael Halcrow */ 406addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 407addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 408addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 409addd65adSMichael Halcrow { 410addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 411a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 412addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 413addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 414addd65adSMichael Halcrow int rc = 0; 415addd65adSMichael Halcrow 416addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 417addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 418addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 419addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 420addd65adSMichael Halcrow goto out_d_drop; 421addd65adSMichael Halcrow } 422addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 4238787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4248787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 4258787c7a3STyler Hicks lower_dir_dentry, 4268787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 4278787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 428addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 429addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4308787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4319f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 4329f37622fSTyler Hicks encrypted_and_encoded_name); 433addd65adSMichael Halcrow goto out_d_drop; 434addd65adSMichael Halcrow } 435addd65adSMichael Halcrow if (lower_dentry->d_inode) 4365ccf9203STyler Hicks goto interpose; 437addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 438addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 4392aac0cf8STyler Hicks if (!(mount_crypt_stat 4402aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 4415ccf9203STyler Hicks goto interpose; 442addd65adSMichael Halcrow dput(lower_dentry); 443addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 444addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 4452aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 446addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 447addd65adSMichael Halcrow if (rc) { 448addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 449addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 450addd65adSMichael Halcrow goto out_d_drop; 451addd65adSMichael Halcrow } 4528787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4538787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 4548787c7a3STyler Hicks lower_dir_dentry, 4558787c7a3STyler Hicks encrypted_and_encoded_name_size); 4568787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 457addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 458addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4598787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4609f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 461addd65adSMichael Halcrow encrypted_and_encoded_name); 462addd65adSMichael Halcrow goto out_d_drop; 463addd65adSMichael Halcrow } 4645ccf9203STyler Hicks interpose: 4655ccf9203STyler Hicks rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, 46670b89021STyler Hicks ecryptfs_dir_inode); 467addd65adSMichael Halcrow goto out; 468addd65adSMichael Halcrow out_d_drop: 469addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 470addd65adSMichael Halcrow out: 471addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 472237fead6SMichael Halcrow return ERR_PTR(rc); 473237fead6SMichael Halcrow } 474237fead6SMichael Halcrow 475237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 476237fead6SMichael Halcrow struct dentry *new_dentry) 477237fead6SMichael Halcrow { 478237fead6SMichael Halcrow struct dentry *lower_old_dentry; 479237fead6SMichael Halcrow struct dentry *lower_new_dentry; 480237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 481237fead6SMichael Halcrow u64 file_size_save; 482237fead6SMichael Halcrow int rc; 483237fead6SMichael Halcrow 484237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 485237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 486237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 487237fead6SMichael Halcrow dget(lower_old_dentry); 488237fead6SMichael Halcrow dget(lower_new_dentry); 489237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 490237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 491237fead6SMichael Halcrow lower_new_dentry); 492237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 493237fead6SMichael Halcrow goto out_lock; 4945ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 495237fead6SMichael Halcrow if (rc) 496237fead6SMichael Halcrow goto out_lock; 4973a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4983a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 499237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 500237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 501237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 502237fead6SMichael Halcrow out_lock: 503237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 504237fead6SMichael Halcrow dput(lower_new_dentry); 505237fead6SMichael Halcrow dput(lower_old_dentry); 506237fead6SMichael Halcrow return rc; 507237fead6SMichael Halcrow } 508237fead6SMichael Halcrow 509237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 510237fead6SMichael Halcrow { 511237fead6SMichael Halcrow int rc = 0; 512237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 513237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 5148dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 515237fead6SMichael Halcrow 5169c2d2056STyler Hicks dget(lower_dentry); 5178dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 518237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 519237fead6SMichael Halcrow if (rc) { 520ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 521237fead6SMichael Halcrow goto out_unlock; 522237fead6SMichael Halcrow } 5230cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 524237fead6SMichael Halcrow dentry->d_inode->i_nlink = 525237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 526237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 527caeeeecfSMichael Halcrow d_drop(dentry); 528237fead6SMichael Halcrow out_unlock: 5298dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 5309c2d2056STyler Hicks dput(lower_dentry); 531237fead6SMichael Halcrow return rc; 532237fead6SMichael Halcrow } 533237fead6SMichael Halcrow 534237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 535237fead6SMichael Halcrow const char *symname) 536237fead6SMichael Halcrow { 537237fead6SMichael Halcrow int rc; 538237fead6SMichael Halcrow struct dentry *lower_dentry; 539237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 540237fead6SMichael Halcrow char *encoded_symname; 541addd65adSMichael Halcrow size_t encoded_symlen; 542addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 543237fead6SMichael Halcrow 544237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 545237fead6SMichael Halcrow dget(lower_dentry); 546237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 547addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 548addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 549addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 550addd65adSMichael Halcrow &encoded_symlen, 551addd65adSMichael Halcrow NULL, 552addd65adSMichael Halcrow mount_crypt_stat, symname, 553addd65adSMichael Halcrow strlen(symname)); 554addd65adSMichael Halcrow if (rc) 555237fead6SMichael Halcrow goto out_lock; 556237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 557db2e747bSMiklos Szeredi encoded_symname); 558237fead6SMichael Halcrow kfree(encoded_symname); 559237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 560237fead6SMichael Halcrow goto out_lock; 5615ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 562237fead6SMichael Halcrow if (rc) 563237fead6SMichael Halcrow goto out_lock; 5640cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5650cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 566237fead6SMichael Halcrow out_lock: 567237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 568237fead6SMichael Halcrow dput(lower_dentry); 569237fead6SMichael Halcrow if (!dentry->d_inode) 570237fead6SMichael Halcrow d_drop(dentry); 571237fead6SMichael Halcrow return rc; 572237fead6SMichael Halcrow } 573237fead6SMichael Halcrow 574237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 575237fead6SMichael Halcrow { 576237fead6SMichael Halcrow int rc; 577237fead6SMichael Halcrow struct dentry *lower_dentry; 578237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 579237fead6SMichael Halcrow 580237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 581237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 582237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 583237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 584237fead6SMichael Halcrow goto out; 5855ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 586237fead6SMichael Halcrow if (rc) 587237fead6SMichael Halcrow goto out; 5880cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5890cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 590237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 591237fead6SMichael Halcrow out: 592237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 593237fead6SMichael Halcrow if (!dentry->d_inode) 594237fead6SMichael Halcrow d_drop(dentry); 595237fead6SMichael Halcrow return rc; 596237fead6SMichael Halcrow } 597237fead6SMichael Halcrow 598237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 599237fead6SMichael Halcrow { 600237fead6SMichael Halcrow struct dentry *lower_dentry; 601237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 60245ec4abaSMichael Halcrow int rc; 603237fead6SMichael Halcrow 604237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 60545ec4abaSMichael Halcrow dget(dentry); 606237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 60745ec4abaSMichael Halcrow dget(lower_dentry); 608237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 60945ec4abaSMichael Halcrow dput(lower_dentry); 61007850552STyler Hicks if (!rc && dentry->d_inode) 61107850552STyler Hicks clear_nlink(dentry->d_inode); 6120cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 613237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 614237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 615237fead6SMichael Halcrow if (!rc) 616237fead6SMichael Halcrow d_drop(dentry); 61745ec4abaSMichael Halcrow dput(dentry); 618237fead6SMichael Halcrow return rc; 619237fead6SMichael Halcrow } 620237fead6SMichael Halcrow 621237fead6SMichael Halcrow static int 622237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 623237fead6SMichael Halcrow { 624237fead6SMichael Halcrow int rc; 625237fead6SMichael Halcrow struct dentry *lower_dentry; 626237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 627237fead6SMichael Halcrow 628237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 629237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 630237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 631237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 632237fead6SMichael Halcrow goto out; 6335ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 634237fead6SMichael Halcrow if (rc) 635237fead6SMichael Halcrow goto out; 6360cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 6370cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 638237fead6SMichael Halcrow out: 639237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 640237fead6SMichael Halcrow if (!dentry->d_inode) 641237fead6SMichael Halcrow d_drop(dentry); 642237fead6SMichael Halcrow return rc; 643237fead6SMichael Halcrow } 644237fead6SMichael Halcrow 645237fead6SMichael Halcrow static int 646237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 647237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 648237fead6SMichael Halcrow { 649237fead6SMichael Halcrow int rc; 650237fead6SMichael Halcrow struct dentry *lower_old_dentry; 651237fead6SMichael Halcrow struct dentry *lower_new_dentry; 652237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 653237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6540d132f73SErez Zadok struct dentry *trap = NULL; 655237fead6SMichael Halcrow 656237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 657237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 658237fead6SMichael Halcrow dget(lower_old_dentry); 659237fead6SMichael Halcrow dget(lower_new_dentry); 660237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 661237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6620d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6630d132f73SErez Zadok /* source should not be ancestor of target */ 6640d132f73SErez Zadok if (trap == lower_old_dentry) { 6650d132f73SErez Zadok rc = -EINVAL; 6660d132f73SErez Zadok goto out_lock; 6670d132f73SErez Zadok } 6680d132f73SErez Zadok /* target should not be ancestor of source */ 6690d132f73SErez Zadok if (trap == lower_new_dentry) { 6700d132f73SErez Zadok rc = -ENOTEMPTY; 6710d132f73SErez Zadok goto out_lock; 6720d132f73SErez Zadok } 673237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 674237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 675237fead6SMichael Halcrow if (rc) 676237fead6SMichael Halcrow goto out_lock; 6779afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 678237fead6SMichael Halcrow if (new_dir != old_dir) 6799afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 680237fead6SMichael Halcrow out_lock: 681237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 682dd55c898STyler Hicks dput(lower_new_dir_dentry); 683dd55c898STyler Hicks dput(lower_old_dir_dentry); 684237fead6SMichael Halcrow dput(lower_new_dentry); 685237fead6SMichael Halcrow dput(lower_old_dentry); 686237fead6SMichael Halcrow return rc; 687237fead6SMichael Halcrow } 688237fead6SMichael Halcrow 6893a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 6903a60a168STyler Hicks size_t *bufsiz) 691237fead6SMichael Halcrow { 6923a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 693237fead6SMichael Halcrow char *lower_buf; 6943a60a168STyler Hicks size_t lower_bufsiz = PATH_MAX; 695addd65adSMichael Halcrow mm_segment_t old_fs; 696addd65adSMichael Halcrow int rc; 697237fead6SMichael Halcrow 6983a6b42caSTyler Hicks lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); 6993a60a168STyler Hicks if (!lower_buf) { 700237fead6SMichael Halcrow rc = -ENOMEM; 701237fead6SMichael Halcrow goto out; 702237fead6SMichael Halcrow } 703237fead6SMichael Halcrow old_fs = get_fs(); 704237fead6SMichael Halcrow set_fs(get_ds()); 705237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 706237fead6SMichael Halcrow (char __user *)lower_buf, 7073a6b42caSTyler Hicks lower_bufsiz); 708237fead6SMichael Halcrow set_fs(old_fs); 7093a60a168STyler Hicks if (rc < 0) 7103a60a168STyler Hicks goto out; 7113a60a168STyler Hicks lower_bufsiz = rc; 7123a60a168STyler Hicks rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, 7133a60a168STyler Hicks lower_buf, lower_bufsiz); 7143a60a168STyler Hicks out: 715237fead6SMichael Halcrow kfree(lower_buf); 7163a60a168STyler Hicks return rc; 7173a60a168STyler Hicks } 7183a60a168STyler Hicks 7193a60a168STyler Hicks static int 7203a60a168STyler Hicks ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 7213a60a168STyler Hicks { 7223a60a168STyler Hicks char *kbuf; 7233a60a168STyler Hicks size_t kbufsiz, copied; 7243a60a168STyler Hicks int rc; 7253a60a168STyler Hicks 7263a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); 7273a60a168STyler Hicks if (rc) 7283a60a168STyler Hicks goto out; 7293a60a168STyler Hicks copied = min_t(size_t, bufsiz, kbufsiz); 7303a60a168STyler Hicks rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; 7313a60a168STyler Hicks kfree(kbuf); 7323a60a168STyler Hicks fsstack_copy_attr_atime(dentry->d_inode, 7333a60a168STyler Hicks ecryptfs_dentry_to_lower(dentry)->d_inode); 734237fead6SMichael Halcrow out: 735237fead6SMichael Halcrow return rc; 736237fead6SMichael Halcrow } 737237fead6SMichael Halcrow 738237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 739237fead6SMichael Halcrow { 740237fead6SMichael Halcrow char *buf; 741237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 742237fead6SMichael Halcrow mm_segment_t old_fs; 743237fead6SMichael Halcrow 744237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 745237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 746237fead6SMichael Halcrow if (!buf) { 747806892e9SOGAWA Hirofumi buf = ERR_PTR(-ENOMEM); 748237fead6SMichael Halcrow goto out; 749237fead6SMichael Halcrow } 750237fead6SMichael Halcrow old_fs = get_fs(); 751237fead6SMichael Halcrow set_fs(get_ds()); 752237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 753237fead6SMichael Halcrow set_fs(old_fs); 754806892e9SOGAWA Hirofumi if (rc < 0) { 755237fead6SMichael Halcrow kfree(buf); 756806892e9SOGAWA Hirofumi buf = ERR_PTR(rc); 757806892e9SOGAWA Hirofumi } else 758806892e9SOGAWA Hirofumi buf[rc] = '\0'; 759237fead6SMichael Halcrow out: 760806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 761806892e9SOGAWA Hirofumi return NULL; 762237fead6SMichael Halcrow } 763237fead6SMichael Halcrow 764237fead6SMichael Halcrow static void 765237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 766237fead6SMichael Halcrow { 767806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 768806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 769237fead6SMichael Halcrow /* Free the char* */ 770806892e9SOGAWA Hirofumi kfree(buf); 771806892e9SOGAWA Hirofumi } 772237fead6SMichael Halcrow } 773237fead6SMichael Halcrow 774237fead6SMichael Halcrow /** 775237fead6SMichael Halcrow * upper_size_to_lower_size 776237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 777237fead6SMichael Halcrow * @upper_size: Size of the upper file 778237fead6SMichael Halcrow * 779cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 780237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 781237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 782237fead6SMichael Halcrow * 783237fead6SMichael Halcrow * Returns Calculated size of the lower file. 784237fead6SMichael Halcrow */ 785237fead6SMichael Halcrow static loff_t 786237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 787237fead6SMichael Halcrow loff_t upper_size) 788237fead6SMichael Halcrow { 789237fead6SMichael Halcrow loff_t lower_size; 790237fead6SMichael Halcrow 791157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 792237fead6SMichael Halcrow if (upper_size != 0) { 793237fead6SMichael Halcrow loff_t num_extents; 794237fead6SMichael Halcrow 795237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 796237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 797237fead6SMichael Halcrow num_extents++; 798237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 799237fead6SMichael Halcrow } 800237fead6SMichael Halcrow return lower_size; 801237fead6SMichael Halcrow } 802237fead6SMichael Halcrow 803237fead6SMichael Halcrow /** 8045f3ef64fSTyler Hicks * truncate_upper 805237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 8065f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 8075f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 808237fead6SMichael Halcrow * 809237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 810237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 8115f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 8125f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 8135f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 8145f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 8155f3ef64fSTyler Hicks * the truncation of the lower inode. 816237fead6SMichael Halcrow * 817237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 818237fead6SMichael Halcrow */ 8195f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 8205f3ef64fSTyler Hicks struct iattr *lower_ia) 821237fead6SMichael Halcrow { 822237fead6SMichael Halcrow int rc = 0; 823237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 824237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 825237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 826237fead6SMichael Halcrow loff_t lower_size_before_truncate; 827237fead6SMichael Halcrow loff_t lower_size_after_truncate; 828237fead6SMichael Halcrow 8295f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 8305f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 831332ab16fSTyler Hicks return 0; 8325f3ef64fSTyler Hicks } 8333b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 834332ab16fSTyler Hicks if (rc) 835332ab16fSTyler Hicks return rc; 836237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 837237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 8385f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 8392ed92554SMichael Halcrow char zero[] = { 0x00 }; 840240e2df5SMichael Halcrow 8415f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 8422ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 8432ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 8442ed92554SMichael Halcrow * the intermediate portion of the previous end of the 8452ed92554SMichael Halcrow * file and the new and of the file */ 84648c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 8475f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 8485f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 8495f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 8505f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 8515f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 8522ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 8532ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 8545f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 8552ed92554SMichael Halcrow 8562c27c65eSChristoph Hellwig 8572c27c65eSChristoph Hellwig /* 8582c27c65eSChristoph Hellwig * XXX(truncate) this should really happen at the begginning 8592c27c65eSChristoph Hellwig * of ->setattr. But the code is too messy to that as part 8602c27c65eSChristoph Hellwig * of a larger patch. ecryptfs is also totally missing out 8612c27c65eSChristoph Hellwig * on the inode_change_ok check at the beginning of 8622c27c65eSChristoph Hellwig * ->setattr while would include this. 8632c27c65eSChristoph Hellwig */ 8642c27c65eSChristoph Hellwig rc = inode_newsize_ok(inode, ia->ia_size); 86513a791b4STyler Hicks if (rc) 86648c1e44aSAl Viro goto out; 8672c27c65eSChristoph Hellwig 8682c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 8692c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8705f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 8715f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 87248c1e44aSAl Viro goto out; 87313a791b4STyler Hicks } 8742ed92554SMichael Halcrow if (num_zeros) { 8752ed92554SMichael Halcrow char *zeros_virt; 8762ed92554SMichael Halcrow 8772ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8782ed92554SMichael Halcrow if (!zeros_virt) { 8792ed92554SMichael Halcrow rc = -ENOMEM; 88048c1e44aSAl Viro goto out; 881240e2df5SMichael Halcrow } 88248c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8835f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8842ed92554SMichael Halcrow kfree(zeros_virt); 8855dda6992SMichael Halcrow if (rc) { 886240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 887240e2df5SMichael Halcrow "the remainder of the end page on " 888240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 88948c1e44aSAl Viro goto out; 890240e2df5SMichael Halcrow } 891240e2df5SMichael Halcrow } 8922c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8930216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 894dd2a3b7aSMichael Halcrow if (rc) { 895dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 896dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 897dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 89848c1e44aSAl Viro goto out; 899dd2a3b7aSMichael Halcrow } 900237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 901237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 902237fead6SMichael Halcrow lower_size_before_truncate = 903237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 904237fead6SMichael Halcrow lower_size_after_truncate = 9055f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 9065f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 9075f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 9085f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 9095f3ef64fSTyler Hicks } else 9105f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 911237fead6SMichael Halcrow } 912237fead6SMichael Halcrow out: 913332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 914237fead6SMichael Halcrow return rc; 915237fead6SMichael Halcrow } 916237fead6SMichael Halcrow 9175f3ef64fSTyler Hicks /** 9185f3ef64fSTyler Hicks * ecryptfs_truncate 9195f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 9205f3ef64fSTyler Hicks * @new_length: The length to expand the file to 9215f3ef64fSTyler Hicks * 9225f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 9235f3ef64fSTyler Hicks * its corresponding lower inode. 9245f3ef64fSTyler Hicks * 9255f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 9265f3ef64fSTyler Hicks */ 9275f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 9285f3ef64fSTyler Hicks { 9295f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 9305f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 9315f3ef64fSTyler Hicks int rc; 9325f3ef64fSTyler Hicks 9335f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 9345f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 9355f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 9365f3ef64fSTyler Hicks 9375f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 9385f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9395f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 9405f3ef64fSTyler Hicks } 9415f3ef64fSTyler Hicks return rc; 9425f3ef64fSTyler Hicks } 9435f3ef64fSTyler Hicks 944237fead6SMichael Halcrow static int 945b74c79e9SNick Piggin ecryptfs_permission(struct inode *inode, int mask, unsigned int flags) 946237fead6SMichael Halcrow { 947b74c79e9SNick Piggin if (flags & IPERM_FLAG_RCU) 948b74c79e9SNick Piggin return -ECHILD; 949f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 950237fead6SMichael Halcrow } 951237fead6SMichael Halcrow 952237fead6SMichael Halcrow /** 953237fead6SMichael Halcrow * ecryptfs_setattr 954237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 955237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 956237fead6SMichael Halcrow * 957237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 958237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 959237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 960237fead6SMichael Halcrow * 961237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 962237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 963237fead6SMichael Halcrow */ 964237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 965237fead6SMichael Halcrow { 966237fead6SMichael Halcrow int rc = 0; 967237fead6SMichael Halcrow struct dentry *lower_dentry; 9685f3ef64fSTyler Hicks struct iattr lower_ia; 969237fead6SMichael Halcrow struct inode *inode; 970237fead6SMichael Halcrow struct inode *lower_inode; 971237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 972237fead6SMichael Halcrow 973237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 974e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 975e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 976237fead6SMichael Halcrow inode = dentry->d_inode; 977237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 978e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 979e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 980e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 981e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 98264ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 98364ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 98464ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 985e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 986e10f281bSMichael Halcrow 987e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 988e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9893b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 990332ab16fSTyler Hicks if (rc) { 991332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 992332ab16fSTyler Hicks goto out; 993332ab16fSTyler Hicks } 994d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 995332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9965dda6992SMichael Halcrow if (rc) { 997e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 998e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 999e10f281bSMichael Halcrow rc = -EIO; 100025bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 1001e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 100225bd8174SMichael Halcrow "or the key could not be retrieved. " 100325bd8174SMichael Halcrow "Plaintext passthrough mode is not " 1004e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 1005e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 1006e10f281bSMichael Halcrow goto out; 1007e10f281bSMichael Halcrow } 1008e10f281bSMichael Halcrow rc = 0; 10093aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 10103aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 1011e10f281bSMichael Halcrow } 1012e10f281bSMichael Halcrow } 1013e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 10145be79de2STyler Hicks if (S_ISREG(inode->i_mode)) { 10155be79de2STyler Hicks rc = filemap_write_and_wait(inode->i_mapping); 10165be79de2STyler Hicks if (rc) 10175be79de2STyler Hicks goto out; 10185be79de2STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 10195be79de2STyler Hicks } 10205f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 10215f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 10225f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 1023237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 10245f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 1025237fead6SMichael Halcrow if (rc < 0) 1026237fead6SMichael Halcrow goto out; 1027237fead6SMichael Halcrow } 10281ac564ecSJeff Layton 10291ac564ecSJeff Layton /* 10301ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 10311ac564ecSJeff Layton * to interpret this in its own way. 10321ac564ecSJeff Layton */ 10335f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 10345f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 10351ac564ecSJeff Layton 10369c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 10375f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 10389c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 1039237fead6SMichael Halcrow out: 10409afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 1041237fead6SMichael Halcrow return rc; 1042237fead6SMichael Halcrow } 1043237fead6SMichael Halcrow 10443a60a168STyler Hicks int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 10453a60a168STyler Hicks struct kstat *stat) 10463a60a168STyler Hicks { 10473a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 10483a60a168STyler Hicks int rc = 0; 10493a60a168STyler Hicks 10503a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 10513a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 10523a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 10533a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 10543a60a168STyler Hicks char *target; 10553a60a168STyler Hicks size_t targetsiz; 10563a60a168STyler Hicks 10573a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 10583a60a168STyler Hicks if (!rc) { 10593a60a168STyler Hicks kfree(target); 10603a60a168STyler Hicks stat->size = targetsiz; 10613a60a168STyler Hicks } 10623a60a168STyler Hicks } 10633a60a168STyler Hicks return rc; 10643a60a168STyler Hicks } 10653a60a168STyler Hicks 1066f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1067f8f484d1STyler Hicks struct kstat *stat) 1068f8f484d1STyler Hicks { 1069f8f484d1STyler Hicks struct kstat lower_stat; 1070f8f484d1STyler Hicks int rc; 1071f8f484d1STyler Hicks 1072f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 1073f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 1074f8f484d1STyler Hicks if (!rc) { 107555f9cf6bSTyler Hicks fsstack_copy_attr_all(dentry->d_inode, 107655f9cf6bSTyler Hicks ecryptfs_inode_to_lower(dentry->d_inode)); 1077f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1078f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1079f8f484d1STyler Hicks } 1080f8f484d1STyler Hicks return rc; 1081f8f484d1STyler Hicks } 1082f8f484d1STyler Hicks 1083dd2a3b7aSMichael Halcrow int 1084237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1085237fead6SMichael Halcrow size_t size, int flags) 1086237fead6SMichael Halcrow { 1087237fead6SMichael Halcrow int rc = 0; 1088237fead6SMichael Halcrow struct dentry *lower_dentry; 1089237fead6SMichael Halcrow 1090237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1091237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1092cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1093237fead6SMichael Halcrow goto out; 1094237fead6SMichael Halcrow } 109548b512e6SRoberto Sassu 109648b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 1097237fead6SMichael Halcrow out: 1098237fead6SMichael Halcrow return rc; 1099237fead6SMichael Halcrow } 1100237fead6SMichael Halcrow 1101dd2a3b7aSMichael Halcrow ssize_t 1102d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1103d7cdc5feSMichael Halcrow void *value, size_t size) 1104d7cdc5feSMichael Halcrow { 1105d7cdc5feSMichael Halcrow int rc = 0; 1106d7cdc5feSMichael Halcrow 1107d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1108cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1109d7cdc5feSMichael Halcrow goto out; 1110d7cdc5feSMichael Halcrow } 1111d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1112d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1113d7cdc5feSMichael Halcrow size); 1114d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1115d7cdc5feSMichael Halcrow out: 1116d7cdc5feSMichael Halcrow return rc; 1117d7cdc5feSMichael Halcrow } 1118d7cdc5feSMichael Halcrow 11197896b631SAdrian Bunk static ssize_t 1120237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1121237fead6SMichael Halcrow size_t size) 1122237fead6SMichael Halcrow { 11232ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 11242ed92554SMichael Halcrow value, size); 1125237fead6SMichael Halcrow } 1126237fead6SMichael Halcrow 1127237fead6SMichael Halcrow static ssize_t 1128237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1129237fead6SMichael Halcrow { 1130237fead6SMichael Halcrow int rc = 0; 1131237fead6SMichael Halcrow struct dentry *lower_dentry; 1132237fead6SMichael Halcrow 1133237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1134237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1135cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1136237fead6SMichael Halcrow goto out; 1137237fead6SMichael Halcrow } 1138237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1139237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1140237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1141237fead6SMichael Halcrow out: 1142237fead6SMichael Halcrow return rc; 1143237fead6SMichael Halcrow } 1144237fead6SMichael Halcrow 1145237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1146237fead6SMichael Halcrow { 1147237fead6SMichael Halcrow int rc = 0; 1148237fead6SMichael Halcrow struct dentry *lower_dentry; 1149237fead6SMichael Halcrow 1150237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1151237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1152cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1153237fead6SMichael Halcrow goto out; 1154237fead6SMichael Halcrow } 1155237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1156237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1157237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1158237fead6SMichael Halcrow out: 1159237fead6SMichael Halcrow return rc; 1160237fead6SMichael Halcrow } 1161237fead6SMichael Halcrow 1162754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1163237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1164237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1165237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1166237fead6SMichael Halcrow .permission = ecryptfs_permission, 1167237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11683a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1169237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1170237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1171237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1172237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1173237fead6SMichael Halcrow }; 1174237fead6SMichael Halcrow 1175754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1176237fead6SMichael Halcrow .create = ecryptfs_create, 1177237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1178237fead6SMichael Halcrow .link = ecryptfs_link, 1179237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1180237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1181237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1182237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1183237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1184237fead6SMichael Halcrow .rename = ecryptfs_rename, 1185237fead6SMichael Halcrow .permission = ecryptfs_permission, 1186237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1187237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1188237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1189237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1190237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1191237fead6SMichael Halcrow }; 1192237fead6SMichael Halcrow 1193754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1194237fead6SMichael Halcrow .permission = ecryptfs_permission, 1195237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1196f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1197237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1198237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1199237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1200237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1201237fead6SMichael Halcrow }; 1202