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 } 262332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry); 263391b52f9SMichael Halcrow if (rc) { 264391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 265332ab16fSTyler Hicks "the lower file for the dentry with name " 266391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 267391b52f9SMichael Halcrow ecryptfs_dentry->d_name.name, rc); 268391b52f9SMichael Halcrow goto out; 269391b52f9SMichael Halcrow } 270d7cdc5feSMichael Halcrow rc = ecryptfs_write_metadata(ecryptfs_dentry); 271332ab16fSTyler Hicks if (rc) 272d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 273332ab16fSTyler Hicks ecryptfs_put_lower_file(ecryptfs_dentry->d_inode); 274237fead6SMichael Halcrow out: 275237fead6SMichael Halcrow return rc; 276237fead6SMichael Halcrow } 277237fead6SMichael Halcrow 278237fead6SMichael Halcrow /** 279237fead6SMichael Halcrow * ecryptfs_create 280237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 281237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 282237fead6SMichael Halcrow * @mode: The mode of the new file. 283237fead6SMichael Halcrow * @nd: nameidata 284237fead6SMichael Halcrow * 285237fead6SMichael Halcrow * Creates a new file. 286237fead6SMichael Halcrow * 287237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 288237fead6SMichael Halcrow */ 289237fead6SMichael Halcrow static int 290237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 291237fead6SMichael Halcrow int mode, struct nameidata *nd) 292237fead6SMichael Halcrow { 293237fead6SMichael Halcrow int rc; 294237fead6SMichael Halcrow 295addd65adSMichael Halcrow /* ecryptfs_do_create() calls ecryptfs_interpose() */ 296237fead6SMichael Halcrow rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); 297237fead6SMichael Halcrow if (unlikely(rc)) { 298237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 299237fead6SMichael Halcrow "lower filesystem\n"); 300237fead6SMichael Halcrow goto out; 301237fead6SMichael Halcrow } 302237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 303237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 304237fead6SMichael Halcrow rc = ecryptfs_initialize_file(ecryptfs_dentry); 305237fead6SMichael Halcrow out: 306237fead6SMichael Halcrow return rc; 307237fead6SMichael Halcrow } 308237fead6SMichael Halcrow 309237fead6SMichael Halcrow /** 3105ccf9203STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 311237fead6SMichael Halcrow */ 3125ccf9203STyler Hicks static int ecryptfs_lookup_interpose(struct dentry *ecryptfs_dentry, 313addd65adSMichael Halcrow struct dentry *lower_dentry, 31470b89021STyler Hicks struct inode *ecryptfs_dir_inode) 315237fead6SMichael Halcrow { 316237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 317237fead6SMichael Halcrow struct vfsmount *lower_mnt; 3185ccf9203STyler Hicks struct inode *inode, *lower_inode; 3192aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 320237fead6SMichael Halcrow char *page_virt = NULL; 321332ab16fSTyler Hicks int put_lower = 0, rc = 0; 322237fead6SMichael Halcrow 323addd65adSMichael Halcrow lower_dir_dentry = lower_dentry->d_parent; 324addd65adSMichael Halcrow lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( 325addd65adSMichael Halcrow ecryptfs_dentry->d_parent)); 326237fead6SMichael Halcrow lower_inode = lower_dentry->d_inode; 327addd65adSMichael Halcrow fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); 328b7ab39f6SNick Piggin BUG_ON(!lower_dentry->d_count); 329addd65adSMichael Halcrow ecryptfs_set_dentry_private(ecryptfs_dentry, 330237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_dentry_info_cache, 331e94b1766SChristoph Lameter GFP_KERNEL)); 332addd65adSMichael Halcrow if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { 333237fead6SMichael Halcrow rc = -ENOMEM; 334addd65adSMichael Halcrow printk(KERN_ERR "%s: Out of memory whilst attempting " 335addd65adSMichael Halcrow "to allocate ecryptfs_dentry_info struct\n", 336addd65adSMichael Halcrow __func__); 33731f73beeSLino Sanfilippo goto out_put; 338237fead6SMichael Halcrow } 339addd65adSMichael Halcrow ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); 340addd65adSMichael Halcrow ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); 341237fead6SMichael Halcrow if (!lower_dentry->d_inode) { 342237fead6SMichael Halcrow /* We want to add because we couldn't find in lower */ 343addd65adSMichael Halcrow d_add(ecryptfs_dentry, NULL); 344237fead6SMichael Halcrow goto out; 345237fead6SMichael Halcrow } 3465ccf9203STyler Hicks inode = __ecryptfs_get_inode(lower_inode, ecryptfs_dir_inode->i_sb); 3475ccf9203STyler Hicks if (IS_ERR(inode)) { 3485ccf9203STyler Hicks rc = PTR_ERR(inode); 349addd65adSMichael Halcrow printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", 350addd65adSMichael Halcrow __func__, rc); 351391b52f9SMichael Halcrow goto out; 352237fead6SMichael Halcrow } 3535ccf9203STyler Hicks if (inode->i_state & I_NEW) 3545ccf9203STyler Hicks unlock_new_inode(inode); 3555ccf9203STyler Hicks d_add(ecryptfs_dentry, inode); 356addd65adSMichael Halcrow if (S_ISDIR(lower_inode->i_mode)) 357237fead6SMichael Halcrow goto out; 358addd65adSMichael Halcrow if (S_ISLNK(lower_inode->i_mode)) 359237fead6SMichael Halcrow goto out; 360addd65adSMichael Halcrow if (special_file(lower_inode->i_mode)) 361202a21d6SRyusuke Konishi goto out; 362237fead6SMichael Halcrow /* Released in this function */ 363addd65adSMichael Halcrow page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); 364237fead6SMichael Halcrow if (!page_virt) { 365addd65adSMichael Halcrow printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", 366addd65adSMichael Halcrow __func__); 367237fead6SMichael Halcrow rc = -ENOMEM; 368391b52f9SMichael Halcrow goto out; 369237fead6SMichael Halcrow } 370332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry); 371391b52f9SMichael Halcrow if (rc) { 372391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 373332ab16fSTyler Hicks "the lower file for the dentry with name " 374391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 375addd65adSMichael Halcrow ecryptfs_dentry->d_name.name, rc); 376addd65adSMichael Halcrow goto out_free_kmem; 377391b52f9SMichael Halcrow } 378332ab16fSTyler Hicks put_lower = 1; 3792aac0cf8STyler Hicks crypt_stat = &ecryptfs_inode_to_private( 3802aac0cf8STyler Hicks ecryptfs_dentry->d_inode)->crypt_stat; 3812aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3822aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3832aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 384d7cdc5feSMichael Halcrow rc = ecryptfs_read_and_validate_header_region(page_virt, 385addd65adSMichael Halcrow ecryptfs_dentry->d_inode); 386237fead6SMichael Halcrow if (rc) { 3871984c23fSTyler Hicks memset(page_virt, 0, PAGE_CACHE_SIZE); 388addd65adSMichael Halcrow rc = ecryptfs_read_and_validate_xattr_region(page_virt, 389addd65adSMichael Halcrow ecryptfs_dentry); 390dd2a3b7aSMichael Halcrow if (rc) { 391237fead6SMichael Halcrow rc = 0; 392addd65adSMichael Halcrow goto out_free_kmem; 393237fead6SMichael Halcrow } 394dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 395dd2a3b7aSMichael Halcrow } 3963aeb86eaSTyler Hicks ecryptfs_i_size_init(page_virt, ecryptfs_dentry->d_inode); 397addd65adSMichael Halcrow out_free_kmem: 398237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 399237fead6SMichael Halcrow goto out; 40031f73beeSLino Sanfilippo out_put: 401237fead6SMichael Halcrow dput(lower_dentry); 40231f73beeSLino Sanfilippo mntput(lower_mnt); 403addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 404237fead6SMichael Halcrow out: 405332ab16fSTyler Hicks if (put_lower) 406332ab16fSTyler Hicks ecryptfs_put_lower_file(ecryptfs_dentry->d_inode); 407addd65adSMichael Halcrow return rc; 408addd65adSMichael Halcrow } 409addd65adSMichael Halcrow 410addd65adSMichael Halcrow /** 411addd65adSMichael Halcrow * ecryptfs_lookup 412addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 413addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 414addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 415addd65adSMichael Halcrow * 416addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 417addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 418addd65adSMichael Halcrow */ 419addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 420addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 421addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 422addd65adSMichael Halcrow { 423addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 424a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 425addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 426addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 427addd65adSMichael Halcrow int rc = 0; 428addd65adSMichael Halcrow 429addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 430addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 431addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 432addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 433addd65adSMichael Halcrow goto out_d_drop; 434addd65adSMichael Halcrow } 435addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 4368787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4378787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 4388787c7a3STyler Hicks lower_dir_dentry, 4398787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 4408787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 441addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 442addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4438787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4449f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 4459f37622fSTyler Hicks encrypted_and_encoded_name); 446addd65adSMichael Halcrow goto out_d_drop; 447addd65adSMichael Halcrow } 448addd65adSMichael Halcrow if (lower_dentry->d_inode) 4495ccf9203STyler Hicks goto interpose; 450addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 451addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 4522aac0cf8STyler Hicks if (!(mount_crypt_stat 4532aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 4545ccf9203STyler Hicks goto interpose; 455addd65adSMichael Halcrow dput(lower_dentry); 456addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 457addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 4582aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 459addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 460addd65adSMichael Halcrow if (rc) { 461addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 462addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 463addd65adSMichael Halcrow goto out_d_drop; 464addd65adSMichael Halcrow } 4658787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4668787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 4678787c7a3STyler Hicks lower_dir_dentry, 4688787c7a3STyler Hicks encrypted_and_encoded_name_size); 4698787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 470addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 471addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4728787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4739f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 474addd65adSMichael Halcrow encrypted_and_encoded_name); 475addd65adSMichael Halcrow goto out_d_drop; 476addd65adSMichael Halcrow } 4775ccf9203STyler Hicks interpose: 4785ccf9203STyler Hicks rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, 47970b89021STyler Hicks ecryptfs_dir_inode); 480addd65adSMichael Halcrow goto out; 481addd65adSMichael Halcrow out_d_drop: 482addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 483addd65adSMichael Halcrow out: 484addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 485237fead6SMichael Halcrow return ERR_PTR(rc); 486237fead6SMichael Halcrow } 487237fead6SMichael Halcrow 488237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 489237fead6SMichael Halcrow struct dentry *new_dentry) 490237fead6SMichael Halcrow { 491237fead6SMichael Halcrow struct dentry *lower_old_dentry; 492237fead6SMichael Halcrow struct dentry *lower_new_dentry; 493237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 494237fead6SMichael Halcrow u64 file_size_save; 495237fead6SMichael Halcrow int rc; 496237fead6SMichael Halcrow 497237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 498237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 499237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 500237fead6SMichael Halcrow dget(lower_old_dentry); 501237fead6SMichael Halcrow dget(lower_new_dentry); 502237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 503237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 504237fead6SMichael Halcrow lower_new_dentry); 505237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 506237fead6SMichael Halcrow goto out_lock; 5075ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 508237fead6SMichael Halcrow if (rc) 509237fead6SMichael Halcrow goto out_lock; 5103a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5113a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 512237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 513237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 514237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 515237fead6SMichael Halcrow out_lock: 516237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 517237fead6SMichael Halcrow dput(lower_new_dentry); 518237fead6SMichael Halcrow dput(lower_old_dentry); 519237fead6SMichael Halcrow return rc; 520237fead6SMichael Halcrow } 521237fead6SMichael Halcrow 522237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 523237fead6SMichael Halcrow { 524237fead6SMichael Halcrow int rc = 0; 525237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 526237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 5278dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 528237fead6SMichael Halcrow 5299c2d2056STyler Hicks dget(lower_dentry); 5308dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 531237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 532237fead6SMichael Halcrow if (rc) { 533ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 534237fead6SMichael Halcrow goto out_unlock; 535237fead6SMichael Halcrow } 5360cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 537237fead6SMichael Halcrow dentry->d_inode->i_nlink = 538237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 539237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 540caeeeecfSMichael Halcrow d_drop(dentry); 541237fead6SMichael Halcrow out_unlock: 5428dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 5439c2d2056STyler Hicks dput(lower_dentry); 544237fead6SMichael Halcrow return rc; 545237fead6SMichael Halcrow } 546237fead6SMichael Halcrow 547237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 548237fead6SMichael Halcrow const char *symname) 549237fead6SMichael Halcrow { 550237fead6SMichael Halcrow int rc; 551237fead6SMichael Halcrow struct dentry *lower_dentry; 552237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 553237fead6SMichael Halcrow char *encoded_symname; 554addd65adSMichael Halcrow size_t encoded_symlen; 555addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 556237fead6SMichael Halcrow 557237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 558237fead6SMichael Halcrow dget(lower_dentry); 559237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 560addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 561addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 562addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 563addd65adSMichael Halcrow &encoded_symlen, 564addd65adSMichael Halcrow NULL, 565addd65adSMichael Halcrow mount_crypt_stat, symname, 566addd65adSMichael Halcrow strlen(symname)); 567addd65adSMichael Halcrow if (rc) 568237fead6SMichael Halcrow goto out_lock; 569237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 570db2e747bSMiklos Szeredi encoded_symname); 571237fead6SMichael Halcrow kfree(encoded_symname); 572237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 573237fead6SMichael Halcrow goto out_lock; 5745ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 575237fead6SMichael Halcrow if (rc) 576237fead6SMichael Halcrow goto out_lock; 5770cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5780cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 579237fead6SMichael Halcrow out_lock: 580237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 581237fead6SMichael Halcrow dput(lower_dentry); 582237fead6SMichael Halcrow if (!dentry->d_inode) 583237fead6SMichael Halcrow d_drop(dentry); 584237fead6SMichael Halcrow return rc; 585237fead6SMichael Halcrow } 586237fead6SMichael Halcrow 587237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 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_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 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 dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 604237fead6SMichael Halcrow out: 605237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 606237fead6SMichael Halcrow if (!dentry->d_inode) 607237fead6SMichael Halcrow d_drop(dentry); 608237fead6SMichael Halcrow return rc; 609237fead6SMichael Halcrow } 610237fead6SMichael Halcrow 611237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 612237fead6SMichael Halcrow { 613237fead6SMichael Halcrow struct dentry *lower_dentry; 614237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 61545ec4abaSMichael Halcrow int rc; 616237fead6SMichael Halcrow 617237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 61845ec4abaSMichael Halcrow dget(dentry); 619237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 62045ec4abaSMichael Halcrow dget(lower_dentry); 621237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 62245ec4abaSMichael Halcrow dput(lower_dentry); 62307850552STyler Hicks if (!rc && dentry->d_inode) 62407850552STyler Hicks clear_nlink(dentry->d_inode); 6250cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 626237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 627237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 628237fead6SMichael Halcrow if (!rc) 629237fead6SMichael Halcrow d_drop(dentry); 63045ec4abaSMichael Halcrow dput(dentry); 631237fead6SMichael Halcrow return rc; 632237fead6SMichael Halcrow } 633237fead6SMichael Halcrow 634237fead6SMichael Halcrow static int 635237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 636237fead6SMichael Halcrow { 637237fead6SMichael Halcrow int rc; 638237fead6SMichael Halcrow struct dentry *lower_dentry; 639237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 640237fead6SMichael Halcrow 641237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 642237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 643237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 644237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 645237fead6SMichael Halcrow goto out; 6465ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 647237fead6SMichael Halcrow if (rc) 648237fead6SMichael Halcrow goto out; 6490cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 6500cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 651237fead6SMichael Halcrow out: 652237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 653237fead6SMichael Halcrow if (!dentry->d_inode) 654237fead6SMichael Halcrow d_drop(dentry); 655237fead6SMichael Halcrow return rc; 656237fead6SMichael Halcrow } 657237fead6SMichael Halcrow 658237fead6SMichael Halcrow static int 659237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 660237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 661237fead6SMichael Halcrow { 662237fead6SMichael Halcrow int rc; 663237fead6SMichael Halcrow struct dentry *lower_old_dentry; 664237fead6SMichael Halcrow struct dentry *lower_new_dentry; 665237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 666237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6670d132f73SErez Zadok struct dentry *trap = NULL; 668237fead6SMichael Halcrow 669237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 670237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 671237fead6SMichael Halcrow dget(lower_old_dentry); 672237fead6SMichael Halcrow dget(lower_new_dentry); 673237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 674237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6750d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6760d132f73SErez Zadok /* source should not be ancestor of target */ 6770d132f73SErez Zadok if (trap == lower_old_dentry) { 6780d132f73SErez Zadok rc = -EINVAL; 6790d132f73SErez Zadok goto out_lock; 6800d132f73SErez Zadok } 6810d132f73SErez Zadok /* target should not be ancestor of source */ 6820d132f73SErez Zadok if (trap == lower_new_dentry) { 6830d132f73SErez Zadok rc = -ENOTEMPTY; 6840d132f73SErez Zadok goto out_lock; 6850d132f73SErez Zadok } 686237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 687237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 688237fead6SMichael Halcrow if (rc) 689237fead6SMichael Halcrow goto out_lock; 6909afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 691237fead6SMichael Halcrow if (new_dir != old_dir) 6929afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 693237fead6SMichael Halcrow out_lock: 694237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 695dd55c898STyler Hicks dput(lower_new_dir_dentry); 696dd55c898STyler Hicks dput(lower_old_dir_dentry); 697237fead6SMichael Halcrow dput(lower_new_dentry); 698237fead6SMichael Halcrow dput(lower_old_dentry); 699237fead6SMichael Halcrow return rc; 700237fead6SMichael Halcrow } 701237fead6SMichael Halcrow 7023a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 7033a60a168STyler Hicks size_t *bufsiz) 704237fead6SMichael Halcrow { 7053a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 706237fead6SMichael Halcrow char *lower_buf; 7073a60a168STyler Hicks size_t lower_bufsiz = PATH_MAX; 708addd65adSMichael Halcrow mm_segment_t old_fs; 709addd65adSMichael Halcrow int rc; 710237fead6SMichael Halcrow 7113a6b42caSTyler Hicks lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); 7123a60a168STyler Hicks if (!lower_buf) { 713237fead6SMichael Halcrow rc = -ENOMEM; 714237fead6SMichael Halcrow goto out; 715237fead6SMichael Halcrow } 716237fead6SMichael Halcrow old_fs = get_fs(); 717237fead6SMichael Halcrow set_fs(get_ds()); 718237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 719237fead6SMichael Halcrow (char __user *)lower_buf, 7203a6b42caSTyler Hicks lower_bufsiz); 721237fead6SMichael Halcrow set_fs(old_fs); 7223a60a168STyler Hicks if (rc < 0) 7233a60a168STyler Hicks goto out; 7243a60a168STyler Hicks lower_bufsiz = rc; 7253a60a168STyler Hicks rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, 7263a60a168STyler Hicks lower_buf, lower_bufsiz); 7273a60a168STyler Hicks out: 728237fead6SMichael Halcrow kfree(lower_buf); 7293a60a168STyler Hicks return rc; 7303a60a168STyler Hicks } 7313a60a168STyler Hicks 7323a60a168STyler Hicks static int 7333a60a168STyler Hicks ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 7343a60a168STyler Hicks { 7353a60a168STyler Hicks char *kbuf; 7363a60a168STyler Hicks size_t kbufsiz, copied; 7373a60a168STyler Hicks int rc; 7383a60a168STyler Hicks 7393a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); 7403a60a168STyler Hicks if (rc) 7413a60a168STyler Hicks goto out; 7423a60a168STyler Hicks copied = min_t(size_t, bufsiz, kbufsiz); 7433a60a168STyler Hicks rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; 7443a60a168STyler Hicks kfree(kbuf); 7453a60a168STyler Hicks fsstack_copy_attr_atime(dentry->d_inode, 7463a60a168STyler Hicks ecryptfs_dentry_to_lower(dentry)->d_inode); 747237fead6SMichael Halcrow out: 748237fead6SMichael Halcrow return rc; 749237fead6SMichael Halcrow } 750237fead6SMichael Halcrow 751237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 752237fead6SMichael Halcrow { 753237fead6SMichael Halcrow char *buf; 754237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 755237fead6SMichael Halcrow mm_segment_t old_fs; 756237fead6SMichael Halcrow 757237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 758237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 759237fead6SMichael Halcrow if (!buf) { 760806892e9SOGAWA Hirofumi buf = ERR_PTR(-ENOMEM); 761237fead6SMichael Halcrow goto out; 762237fead6SMichael Halcrow } 763237fead6SMichael Halcrow old_fs = get_fs(); 764237fead6SMichael Halcrow set_fs(get_ds()); 765237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 766237fead6SMichael Halcrow set_fs(old_fs); 767806892e9SOGAWA Hirofumi if (rc < 0) { 768237fead6SMichael Halcrow kfree(buf); 769806892e9SOGAWA Hirofumi buf = ERR_PTR(rc); 770806892e9SOGAWA Hirofumi } else 771806892e9SOGAWA Hirofumi buf[rc] = '\0'; 772237fead6SMichael Halcrow out: 773806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 774806892e9SOGAWA Hirofumi return NULL; 775237fead6SMichael Halcrow } 776237fead6SMichael Halcrow 777237fead6SMichael Halcrow static void 778237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 779237fead6SMichael Halcrow { 780806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 781806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 782237fead6SMichael Halcrow /* Free the char* */ 783806892e9SOGAWA Hirofumi kfree(buf); 784806892e9SOGAWA Hirofumi } 785237fead6SMichael Halcrow } 786237fead6SMichael Halcrow 787237fead6SMichael Halcrow /** 788237fead6SMichael Halcrow * upper_size_to_lower_size 789237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 790237fead6SMichael Halcrow * @upper_size: Size of the upper file 791237fead6SMichael Halcrow * 792cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 793237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 794237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 795237fead6SMichael Halcrow * 796237fead6SMichael Halcrow * Returns Calculated size of the lower file. 797237fead6SMichael Halcrow */ 798237fead6SMichael Halcrow static loff_t 799237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 800237fead6SMichael Halcrow loff_t upper_size) 801237fead6SMichael Halcrow { 802237fead6SMichael Halcrow loff_t lower_size; 803237fead6SMichael Halcrow 804157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 805237fead6SMichael Halcrow if (upper_size != 0) { 806237fead6SMichael Halcrow loff_t num_extents; 807237fead6SMichael Halcrow 808237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 809237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 810237fead6SMichael Halcrow num_extents++; 811237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 812237fead6SMichael Halcrow } 813237fead6SMichael Halcrow return lower_size; 814237fead6SMichael Halcrow } 815237fead6SMichael Halcrow 816237fead6SMichael Halcrow /** 8175f3ef64fSTyler Hicks * truncate_upper 818237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 8195f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 8205f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 821237fead6SMichael Halcrow * 822237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 823237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 8245f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 8255f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 8265f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 8275f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 8285f3ef64fSTyler Hicks * the truncation of the lower inode. 829237fead6SMichael Halcrow * 830237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 831237fead6SMichael Halcrow */ 8325f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 8335f3ef64fSTyler Hicks struct iattr *lower_ia) 834237fead6SMichael Halcrow { 835237fead6SMichael Halcrow int rc = 0; 836237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 837237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 838237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 839237fead6SMichael Halcrow loff_t lower_size_before_truncate; 840237fead6SMichael Halcrow loff_t lower_size_after_truncate; 841237fead6SMichael Halcrow 8425f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 8435f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 844332ab16fSTyler Hicks return 0; 8455f3ef64fSTyler Hicks } 846332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(dentry); 847332ab16fSTyler Hicks if (rc) 848332ab16fSTyler Hicks return rc; 849237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 850237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 8515f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 8522ed92554SMichael Halcrow char zero[] = { 0x00 }; 853240e2df5SMichael Halcrow 8545f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 8552ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 8562ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 8572ed92554SMichael Halcrow * the intermediate portion of the previous end of the 8582ed92554SMichael Halcrow * file and the new and of the file */ 85948c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 8605f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 8615f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 8625f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 8635f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 8645f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 8652ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 8662ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 8675f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 8682ed92554SMichael Halcrow 8692c27c65eSChristoph Hellwig 8702c27c65eSChristoph Hellwig /* 8712c27c65eSChristoph Hellwig * XXX(truncate) this should really happen at the begginning 8722c27c65eSChristoph Hellwig * of ->setattr. But the code is too messy to that as part 8732c27c65eSChristoph Hellwig * of a larger patch. ecryptfs is also totally missing out 8742c27c65eSChristoph Hellwig * on the inode_change_ok check at the beginning of 8752c27c65eSChristoph Hellwig * ->setattr while would include this. 8762c27c65eSChristoph Hellwig */ 8772c27c65eSChristoph Hellwig rc = inode_newsize_ok(inode, ia->ia_size); 87813a791b4STyler Hicks if (rc) 87948c1e44aSAl Viro goto out; 8802c27c65eSChristoph Hellwig 8812c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 8822c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8835f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 8845f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 88548c1e44aSAl Viro goto out; 88613a791b4STyler Hicks } 8872ed92554SMichael Halcrow if (num_zeros) { 8882ed92554SMichael Halcrow char *zeros_virt; 8892ed92554SMichael Halcrow 8902ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8912ed92554SMichael Halcrow if (!zeros_virt) { 8922ed92554SMichael Halcrow rc = -ENOMEM; 89348c1e44aSAl Viro goto out; 894240e2df5SMichael Halcrow } 89548c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8965f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8972ed92554SMichael Halcrow kfree(zeros_virt); 8985dda6992SMichael Halcrow if (rc) { 899240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 900240e2df5SMichael Halcrow "the remainder of the end page on " 901240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 90248c1e44aSAl Viro goto out; 903240e2df5SMichael Halcrow } 904240e2df5SMichael Halcrow } 9052c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 9060216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 907dd2a3b7aSMichael Halcrow if (rc) { 908dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 909dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 910dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 91148c1e44aSAl Viro goto out; 912dd2a3b7aSMichael Halcrow } 913237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 914237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 915237fead6SMichael Halcrow lower_size_before_truncate = 916237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 917237fead6SMichael Halcrow lower_size_after_truncate = 9185f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 9195f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 9205f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 9215f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 9225f3ef64fSTyler Hicks } else 9235f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 924237fead6SMichael Halcrow } 925237fead6SMichael Halcrow out: 926332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 927237fead6SMichael Halcrow return rc; 928237fead6SMichael Halcrow } 929237fead6SMichael Halcrow 9305f3ef64fSTyler Hicks /** 9315f3ef64fSTyler Hicks * ecryptfs_truncate 9325f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 9335f3ef64fSTyler Hicks * @new_length: The length to expand the file to 9345f3ef64fSTyler Hicks * 9355f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 9365f3ef64fSTyler Hicks * its corresponding lower inode. 9375f3ef64fSTyler Hicks * 9385f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 9395f3ef64fSTyler Hicks */ 9405f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 9415f3ef64fSTyler Hicks { 9425f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 9435f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 9445f3ef64fSTyler Hicks int rc; 9455f3ef64fSTyler Hicks 9465f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 9475f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 9485f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 9495f3ef64fSTyler Hicks 9505f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 9515f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9525f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 9535f3ef64fSTyler Hicks } 9545f3ef64fSTyler Hicks return rc; 9555f3ef64fSTyler Hicks } 9565f3ef64fSTyler Hicks 957237fead6SMichael Halcrow static int 958b74c79e9SNick Piggin ecryptfs_permission(struct inode *inode, int mask, unsigned int flags) 959237fead6SMichael Halcrow { 960b74c79e9SNick Piggin if (flags & IPERM_FLAG_RCU) 961b74c79e9SNick Piggin return -ECHILD; 962f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 963237fead6SMichael Halcrow } 964237fead6SMichael Halcrow 965237fead6SMichael Halcrow /** 966237fead6SMichael Halcrow * ecryptfs_setattr 967237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 968237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 969237fead6SMichael Halcrow * 970237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 971237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 972237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 973237fead6SMichael Halcrow * 974237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 975237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 976237fead6SMichael Halcrow */ 977237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 978237fead6SMichael Halcrow { 979237fead6SMichael Halcrow int rc = 0; 980237fead6SMichael Halcrow struct dentry *lower_dentry; 9815f3ef64fSTyler Hicks struct iattr lower_ia; 982237fead6SMichael Halcrow struct inode *inode; 983237fead6SMichael Halcrow struct inode *lower_inode; 984237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 985237fead6SMichael Halcrow 986237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 987e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 988e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 989237fead6SMichael Halcrow inode = dentry->d_inode; 990237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 991e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 992e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 993e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 994e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 99564ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 99664ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 99764ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 998e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 999e10f281bSMichael Halcrow 1000e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 1001e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 1002332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(dentry); 1003332ab16fSTyler Hicks if (rc) { 1004332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 1005332ab16fSTyler Hicks goto out; 1006332ab16fSTyler Hicks } 1007d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 1008332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 10095dda6992SMichael Halcrow if (rc) { 1010e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 1011e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 1012e10f281bSMichael Halcrow rc = -EIO; 101325bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 1014e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 101525bd8174SMichael Halcrow "or the key could not be retrieved. " 101625bd8174SMichael Halcrow "Plaintext passthrough mode is not " 1017e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 1018e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 1019e10f281bSMichael Halcrow goto out; 1020e10f281bSMichael Halcrow } 1021e10f281bSMichael Halcrow rc = 0; 10223aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 10233aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 1024e10f281bSMichael Halcrow } 1025e10f281bSMichael Halcrow } 1026e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 10275be79de2STyler Hicks if (S_ISREG(inode->i_mode)) { 10285be79de2STyler Hicks rc = filemap_write_and_wait(inode->i_mapping); 10295be79de2STyler Hicks if (rc) 10305be79de2STyler Hicks goto out; 10315be79de2STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 10325be79de2STyler Hicks } 10335f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 10345f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 10355f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 1036237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 10375f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 1038237fead6SMichael Halcrow if (rc < 0) 1039237fead6SMichael Halcrow goto out; 1040237fead6SMichael Halcrow } 10411ac564ecSJeff Layton 10421ac564ecSJeff Layton /* 10431ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 10441ac564ecSJeff Layton * to interpret this in its own way. 10451ac564ecSJeff Layton */ 10465f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 10475f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 10481ac564ecSJeff Layton 10499c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 10505f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 10519c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 1052237fead6SMichael Halcrow out: 10539afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 1054237fead6SMichael Halcrow return rc; 1055237fead6SMichael Halcrow } 1056237fead6SMichael Halcrow 10573a60a168STyler Hicks int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 10583a60a168STyler Hicks struct kstat *stat) 10593a60a168STyler Hicks { 10603a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 10613a60a168STyler Hicks int rc = 0; 10623a60a168STyler Hicks 10633a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 10643a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 10653a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 10663a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 10673a60a168STyler Hicks char *target; 10683a60a168STyler Hicks size_t targetsiz; 10693a60a168STyler Hicks 10703a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 10713a60a168STyler Hicks if (!rc) { 10723a60a168STyler Hicks kfree(target); 10733a60a168STyler Hicks stat->size = targetsiz; 10743a60a168STyler Hicks } 10753a60a168STyler Hicks } 10763a60a168STyler Hicks return rc; 10773a60a168STyler Hicks } 10783a60a168STyler Hicks 1079f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1080f8f484d1STyler Hicks struct kstat *stat) 1081f8f484d1STyler Hicks { 1082f8f484d1STyler Hicks struct kstat lower_stat; 1083f8f484d1STyler Hicks int rc; 1084f8f484d1STyler Hicks 1085f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 1086f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 1087f8f484d1STyler Hicks if (!rc) { 108855f9cf6bSTyler Hicks fsstack_copy_attr_all(dentry->d_inode, 108955f9cf6bSTyler Hicks ecryptfs_inode_to_lower(dentry->d_inode)); 1090f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1091f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1092f8f484d1STyler Hicks } 1093f8f484d1STyler Hicks return rc; 1094f8f484d1STyler Hicks } 1095f8f484d1STyler Hicks 1096dd2a3b7aSMichael Halcrow int 1097237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1098237fead6SMichael Halcrow size_t size, int flags) 1099237fead6SMichael Halcrow { 1100237fead6SMichael Halcrow int rc = 0; 1101237fead6SMichael Halcrow struct dentry *lower_dentry; 1102237fead6SMichael Halcrow 1103237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1104237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1105cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1106237fead6SMichael Halcrow goto out; 1107237fead6SMichael Halcrow } 110848b512e6SRoberto Sassu 110948b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 1110237fead6SMichael Halcrow out: 1111237fead6SMichael Halcrow return rc; 1112237fead6SMichael Halcrow } 1113237fead6SMichael Halcrow 1114dd2a3b7aSMichael Halcrow ssize_t 1115d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1116d7cdc5feSMichael Halcrow void *value, size_t size) 1117d7cdc5feSMichael Halcrow { 1118d7cdc5feSMichael Halcrow int rc = 0; 1119d7cdc5feSMichael Halcrow 1120d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1121cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1122d7cdc5feSMichael Halcrow goto out; 1123d7cdc5feSMichael Halcrow } 1124d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1125d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1126d7cdc5feSMichael Halcrow size); 1127d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1128d7cdc5feSMichael Halcrow out: 1129d7cdc5feSMichael Halcrow return rc; 1130d7cdc5feSMichael Halcrow } 1131d7cdc5feSMichael Halcrow 11327896b631SAdrian Bunk static ssize_t 1133237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1134237fead6SMichael Halcrow size_t size) 1135237fead6SMichael Halcrow { 11362ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 11372ed92554SMichael Halcrow value, size); 1138237fead6SMichael Halcrow } 1139237fead6SMichael Halcrow 1140237fead6SMichael Halcrow static ssize_t 1141237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1142237fead6SMichael Halcrow { 1143237fead6SMichael Halcrow int rc = 0; 1144237fead6SMichael Halcrow struct dentry *lower_dentry; 1145237fead6SMichael Halcrow 1146237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1147237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1148cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1149237fead6SMichael Halcrow goto out; 1150237fead6SMichael Halcrow } 1151237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1152237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1153237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1154237fead6SMichael Halcrow out: 1155237fead6SMichael Halcrow return rc; 1156237fead6SMichael Halcrow } 1157237fead6SMichael Halcrow 1158237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1159237fead6SMichael Halcrow { 1160237fead6SMichael Halcrow int rc = 0; 1161237fead6SMichael Halcrow struct dentry *lower_dentry; 1162237fead6SMichael Halcrow 1163237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1164237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1165cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1166237fead6SMichael Halcrow goto out; 1167237fead6SMichael Halcrow } 1168237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1169237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1170237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1171237fead6SMichael Halcrow out: 1172237fead6SMichael Halcrow return rc; 1173237fead6SMichael Halcrow } 1174237fead6SMichael Halcrow 1175754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1176237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1177237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1178237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1179237fead6SMichael Halcrow .permission = ecryptfs_permission, 1180237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11813a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1182237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1183237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1184237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1185237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1186237fead6SMichael Halcrow }; 1187237fead6SMichael Halcrow 1188754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1189237fead6SMichael Halcrow .create = ecryptfs_create, 1190237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1191237fead6SMichael Halcrow .link = ecryptfs_link, 1192237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1193237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1194237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1195237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1196237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1197237fead6SMichael Halcrow .rename = ecryptfs_rename, 1198237fead6SMichael Halcrow .permission = ecryptfs_permission, 1199237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1200237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1201237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1202237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1203237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1204237fead6SMichael Halcrow }; 1205237fead6SMichael Halcrow 1206754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1207237fead6SMichael Halcrow .permission = ecryptfs_permission, 1208237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1209f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1210237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1211237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1212237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1213237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1214237fead6SMichael Halcrow }; 1215