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> 320cc72dc7SJosef "Jeff" Sipek #include <linux/fs_stack.h> 335a0e3ad6STejun Heo #include <linux/slab.h> 3448b512e6SRoberto Sassu #include <linux/xattr.h> 350a688ad7SHarvey Harrison #include <asm/unaligned.h> 36237fead6SMichael Halcrow #include "ecryptfs_kernel.h" 37237fead6SMichael Halcrow 38237fead6SMichael Halcrow static struct dentry *lock_parent(struct dentry *dentry) 39237fead6SMichael Halcrow { 40237fead6SMichael Halcrow struct dentry *dir; 41237fead6SMichael Halcrow 428dc4e373SMiklos Szeredi dir = dget_parent(dentry); 435955102cSAl Viro inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); 44237fead6SMichael Halcrow return dir; 45237fead6SMichael Halcrow } 46237fead6SMichael Halcrow 47237fead6SMichael Halcrow static void unlock_dir(struct dentry *dir) 48237fead6SMichael Halcrow { 495955102cSAl Viro inode_unlock(d_inode(dir)); 50237fead6SMichael Halcrow dput(dir); 51237fead6SMichael Halcrow } 52237fead6SMichael Halcrow 53c4f79073STyler Hicks static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) 54c4f79073STyler Hicks { 55c4cf3ba4SHimangi Saraogi return ecryptfs_inode_to_lower(inode) == lower_inode; 56c4f79073STyler Hicks } 57c4f79073STyler Hicks 585ccf9203STyler Hicks static int ecryptfs_inode_set(struct inode *inode, void *opaque) 59c4f79073STyler Hicks { 605ccf9203STyler Hicks struct inode *lower_inode = opaque; 615ccf9203STyler Hicks 625ccf9203STyler Hicks ecryptfs_set_inode_lower(inode, lower_inode); 635ccf9203STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 645ccf9203STyler Hicks /* i_size will be overwritten for encrypted regular files */ 655ccf9203STyler Hicks fsstack_copy_inode_size(inode, lower_inode); 665ccf9203STyler Hicks inode->i_ino = lower_inode->i_ino; 67c4f79073STyler Hicks inode->i_version++; 68c4f79073STyler Hicks inode->i_mapping->a_ops = &ecryptfs_aops; 695ccf9203STyler Hicks 705ccf9203STyler Hicks if (S_ISLNK(inode->i_mode)) 715ccf9203STyler Hicks inode->i_op = &ecryptfs_symlink_iops; 725ccf9203STyler Hicks else if (S_ISDIR(inode->i_mode)) 735ccf9203STyler Hicks inode->i_op = &ecryptfs_dir_iops; 745ccf9203STyler Hicks else 755ccf9203STyler Hicks inode->i_op = &ecryptfs_main_iops; 765ccf9203STyler Hicks 775ccf9203STyler Hicks if (S_ISDIR(inode->i_mode)) 785ccf9203STyler Hicks inode->i_fop = &ecryptfs_dir_fops; 795ccf9203STyler Hicks else if (special_file(inode->i_mode)) 805ccf9203STyler Hicks init_special_inode(inode, inode->i_mode, inode->i_rdev); 815ccf9203STyler Hicks else 825ccf9203STyler Hicks inode->i_fop = &ecryptfs_main_fops; 835ccf9203STyler Hicks 84c4f79073STyler Hicks return 0; 85c4f79073STyler Hicks } 86c4f79073STyler Hicks 875ccf9203STyler Hicks static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, 885ccf9203STyler Hicks struct super_block *sb) 895ccf9203STyler Hicks { 905ccf9203STyler Hicks struct inode *inode; 915ccf9203STyler Hicks 925ccf9203STyler Hicks if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) 935ccf9203STyler Hicks return ERR_PTR(-EXDEV); 945ccf9203STyler Hicks if (!igrab(lower_inode)) 955ccf9203STyler Hicks return ERR_PTR(-ESTALE); 965ccf9203STyler Hicks inode = iget5_locked(sb, (unsigned long)lower_inode, 975ccf9203STyler Hicks ecryptfs_inode_test, ecryptfs_inode_set, 985ccf9203STyler Hicks lower_inode); 995ccf9203STyler Hicks if (!inode) { 1005ccf9203STyler Hicks iput(lower_inode); 1015ccf9203STyler Hicks return ERR_PTR(-EACCES); 1025ccf9203STyler Hicks } 1035ccf9203STyler Hicks if (!(inode->i_state & I_NEW)) 1045ccf9203STyler Hicks iput(lower_inode); 1055ccf9203STyler Hicks 1065ccf9203STyler Hicks return inode; 1075ccf9203STyler Hicks } 1085ccf9203STyler Hicks 109c4f79073STyler Hicks struct inode *ecryptfs_get_inode(struct inode *lower_inode, 110c4f79073STyler Hicks struct super_block *sb) 111c4f79073STyler Hicks { 1125ccf9203STyler Hicks struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); 113c4f79073STyler Hicks 1145ccf9203STyler Hicks if (!IS_ERR(inode) && (inode->i_state & I_NEW)) 115c4f79073STyler Hicks unlock_new_inode(inode); 1165ccf9203STyler Hicks 117c4f79073STyler Hicks return inode; 118c4f79073STyler Hicks } 119c4f79073STyler Hicks 120c4f79073STyler Hicks /** 121c4f79073STyler Hicks * ecryptfs_interpose 122c4f79073STyler Hicks * @lower_dentry: Existing dentry in the lower filesystem 123c4f79073STyler Hicks * @dentry: ecryptfs' dentry 124c4f79073STyler Hicks * @sb: ecryptfs's super_block 125c4f79073STyler Hicks * 126c4f79073STyler Hicks * Interposes upper and lower dentries. 127c4f79073STyler Hicks * 128c4f79073STyler Hicks * Returns zero on success; non-zero otherwise 129c4f79073STyler Hicks */ 130c4f79073STyler Hicks static int ecryptfs_interpose(struct dentry *lower_dentry, 1315ccf9203STyler Hicks struct dentry *dentry, struct super_block *sb) 132c4f79073STyler Hicks { 1332b0143b5SDavid Howells struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); 1345ccf9203STyler Hicks 135c4f79073STyler Hicks if (IS_ERR(inode)) 136c4f79073STyler Hicks return PTR_ERR(inode); 137c4f79073STyler Hicks d_instantiate(dentry, inode); 1385ccf9203STyler Hicks 139c4f79073STyler Hicks return 0; 140c4f79073STyler Hicks } 141c4f79073STyler Hicks 1428bc2d3cfSTyler Hicks static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, 1438bc2d3cfSTyler Hicks struct inode *inode) 1448bc2d3cfSTyler Hicks { 1458bc2d3cfSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 1468bc2d3cfSTyler Hicks struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 1478bc2d3cfSTyler Hicks struct dentry *lower_dir_dentry; 1488bc2d3cfSTyler Hicks int rc; 1498bc2d3cfSTyler Hicks 1508bc2d3cfSTyler Hicks dget(lower_dentry); 1518bc2d3cfSTyler Hicks lower_dir_dentry = lock_parent(lower_dentry); 152b21996e3SJ. Bruce Fields rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); 1538bc2d3cfSTyler Hicks if (rc) { 1548bc2d3cfSTyler Hicks printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 1558bc2d3cfSTyler Hicks goto out_unlock; 1568bc2d3cfSTyler Hicks } 1578bc2d3cfSTyler Hicks fsstack_copy_attr_times(dir, lower_dir_inode); 1588bc2d3cfSTyler Hicks set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); 1598bc2d3cfSTyler Hicks inode->i_ctime = dir->i_ctime; 1608bc2d3cfSTyler Hicks d_drop(dentry); 1618bc2d3cfSTyler Hicks out_unlock: 1628bc2d3cfSTyler Hicks unlock_dir(lower_dir_dentry); 1638bc2d3cfSTyler Hicks dput(lower_dentry); 1648bc2d3cfSTyler Hicks return rc; 1658bc2d3cfSTyler Hicks } 1668bc2d3cfSTyler Hicks 167237fead6SMichael Halcrow /** 168237fead6SMichael Halcrow * ecryptfs_do_create 169237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 170237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 171237fead6SMichael Halcrow * @mode: The mode of the new file 172237fead6SMichael Halcrow * 173237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 174237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 175237fead6SMichael Halcrow * stat of the lower directory inode. 176237fead6SMichael Halcrow * 177b59db43aSTyler Hicks * Returns the new eCryptfs inode on success; an ERR_PTR on error condition 178237fead6SMichael Halcrow */ 179b59db43aSTyler Hicks static struct inode * 180237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 181175a4eb7SAl Viro struct dentry *ecryptfs_dentry, umode_t mode) 182237fead6SMichael Halcrow { 183237fead6SMichael Halcrow int rc; 184237fead6SMichael Halcrow struct dentry *lower_dentry; 185237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 186b59db43aSTyler Hicks struct inode *inode; 187237fead6SMichael Halcrow 188237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 189237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 1902b0143b5SDavid Howells rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true); 1914981e081SMichael Halcrow if (rc) { 192caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 19318d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 194b59db43aSTyler Hicks inode = ERR_PTR(rc); 195237fead6SMichael Halcrow goto out_lock; 196237fead6SMichael Halcrow } 1972b0143b5SDavid Howells inode = __ecryptfs_get_inode(d_inode(lower_dentry), 1985ccf9203STyler Hicks directory_inode->i_sb); 1998bc2d3cfSTyler Hicks if (IS_ERR(inode)) { 2002b0143b5SDavid Howells vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL); 201237fead6SMichael Halcrow goto out_lock; 2028bc2d3cfSTyler Hicks } 2032b0143b5SDavid Howells fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); 2042b0143b5SDavid Howells fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); 205237fead6SMichael Halcrow out_lock: 206237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 207b59db43aSTyler Hicks return inode; 208237fead6SMichael Halcrow } 209237fead6SMichael Halcrow 210237fead6SMichael Halcrow /** 211237fead6SMichael Halcrow * ecryptfs_initialize_file 212237fead6SMichael Halcrow * 213237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 214237fead6SMichael Halcrow * file with a header and first data page. 215237fead6SMichael Halcrow * 216237fead6SMichael Halcrow * Returns zero on success 217237fead6SMichael Halcrow */ 218e3ccaa97STyler Hicks int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, 219b59db43aSTyler Hicks struct inode *ecryptfs_inode) 220237fead6SMichael Halcrow { 221d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 222b59db43aSTyler Hicks &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; 223237fead6SMichael Halcrow int rc = 0; 224237fead6SMichael Halcrow 225b59db43aSTyler Hicks if (S_ISDIR(ecryptfs_inode->i_mode)) { 226237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 227e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 228d7cdc5feSMichael Halcrow goto out; 229237fead6SMichael Halcrow } 230237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 231b59db43aSTyler Hicks rc = ecryptfs_new_file_context(ecryptfs_inode); 232237fead6SMichael Halcrow if (rc) { 233d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 234d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 235d7cdc5feSMichael Halcrow goto out; 236237fead6SMichael Halcrow } 237b59db43aSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); 238391b52f9SMichael Halcrow if (rc) { 239391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 240332ab16fSTyler Hicks "the lower file for the dentry with name " 2419e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2429e78d14aSDavid Howells ecryptfs_dentry, rc); 243391b52f9SMichael Halcrow goto out; 244391b52f9SMichael Halcrow } 245b59db43aSTyler Hicks rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); 246332ab16fSTyler Hicks if (rc) 247d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 248b59db43aSTyler Hicks ecryptfs_put_lower_file(ecryptfs_inode); 249237fead6SMichael Halcrow out: 250237fead6SMichael Halcrow return rc; 251237fead6SMichael Halcrow } 252237fead6SMichael Halcrow 253237fead6SMichael Halcrow /** 254237fead6SMichael Halcrow * ecryptfs_create 255237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 256237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 257237fead6SMichael Halcrow * @mode: The mode of the new file. 258237fead6SMichael Halcrow * 259237fead6SMichael Halcrow * Creates a new file. 260237fead6SMichael Halcrow * 261237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 262237fead6SMichael Halcrow */ 263237fead6SMichael Halcrow static int 264237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 265ebfc3b49SAl Viro umode_t mode, bool excl) 266237fead6SMichael Halcrow { 267b59db43aSTyler Hicks struct inode *ecryptfs_inode; 268237fead6SMichael Halcrow int rc; 269237fead6SMichael Halcrow 270b59db43aSTyler Hicks ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, 271b59db43aSTyler Hicks mode); 272a1c83681SViresh Kumar if (IS_ERR(ecryptfs_inode)) { 273237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 274237fead6SMichael Halcrow "lower filesystem\n"); 275b59db43aSTyler Hicks rc = PTR_ERR(ecryptfs_inode); 276237fead6SMichael Halcrow goto out; 277237fead6SMichael Halcrow } 278237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 279237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 280b59db43aSTyler Hicks rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); 281b59db43aSTyler Hicks if (rc) { 2828bc2d3cfSTyler Hicks ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, 2838bc2d3cfSTyler Hicks ecryptfs_inode); 2840e81ba23SAl Viro iget_failed(ecryptfs_inode); 285b59db43aSTyler Hicks goto out; 286b59db43aSTyler Hicks } 287b59db43aSTyler Hicks unlock_new_inode(ecryptfs_inode); 2888fc37ec5SAl Viro d_instantiate(ecryptfs_dentry, ecryptfs_inode); 289237fead6SMichael Halcrow out: 290237fead6SMichael Halcrow return rc; 291237fead6SMichael Halcrow } 292237fead6SMichael Halcrow 293778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 294237fead6SMichael Halcrow { 2952aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 296778aeb42STyler Hicks int rc; 297237fead6SMichael Halcrow 298778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 299391b52f9SMichael Halcrow if (rc) { 300391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 301332ab16fSTyler Hicks "the lower file for the dentry with name " 3029e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 3039e78d14aSDavid Howells dentry, rc); 304778aeb42STyler Hicks return rc; 305391b52f9SMichael Halcrow } 306778aeb42STyler Hicks 3073b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 3082aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3092aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3102aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 311778aeb42STyler Hicks 312778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 313778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 314237fead6SMichael Halcrow if (rc) { 315778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 316778aeb42STyler Hicks if (!rc) 317dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 318dd2a3b7aSMichael Halcrow } 319778aeb42STyler Hicks 320778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 321778aeb42STyler Hicks return 0; 322778aeb42STyler Hicks } 323778aeb42STyler Hicks 324778aeb42STyler Hicks /** 325778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 326778aeb42STyler Hicks */ 327778aeb42STyler Hicks static int ecryptfs_lookup_interpose(struct dentry *dentry, 328778aeb42STyler Hicks struct dentry *lower_dentry, 329778aeb42STyler Hicks struct inode *dir_inode) 330778aeb42STyler Hicks { 3312b0143b5SDavid Howells struct inode *inode, *lower_inode = d_inode(lower_dentry); 332778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 333778aeb42STyler Hicks struct vfsmount *lower_mnt; 334778aeb42STyler Hicks int rc = 0; 335778aeb42STyler Hicks 336778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 337778aeb42STyler Hicks if (!dentry_info) { 338778aeb42STyler Hicks printk(KERN_ERR "%s: Out of memory whilst attempting " 339778aeb42STyler Hicks "to allocate ecryptfs_dentry_info struct\n", 340778aeb42STyler Hicks __func__); 341237fead6SMichael Halcrow dput(lower_dentry); 342778aeb42STyler Hicks return -ENOMEM; 343778aeb42STyler Hicks } 3440b1d9011SAl Viro 3450b1d9011SAl Viro lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 3462b0143b5SDavid Howells fsstack_copy_attr_atime(dir_inode, d_inode(lower_dentry->d_parent)); 34784d08fa8SAl Viro BUG_ON(!d_count(lower_dentry)); 3480b1d9011SAl Viro 3490b1d9011SAl Viro ecryptfs_set_dentry_private(dentry, dentry_info); 35092dd1230SAl Viro dentry_info->lower_path.mnt = lower_mnt; 35192dd1230SAl Viro dentry_info->lower_path.dentry = lower_dentry; 352778aeb42STyler Hicks 3532b0143b5SDavid Howells if (d_really_is_negative(lower_dentry)) { 354778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 355778aeb42STyler Hicks d_add(dentry, NULL); 356778aeb42STyler Hicks return 0; 357778aeb42STyler Hicks } 358778aeb42STyler Hicks inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); 359778aeb42STyler Hicks if (IS_ERR(inode)) { 360778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 361778aeb42STyler Hicks __func__, PTR_ERR(inode)); 362778aeb42STyler Hicks return PTR_ERR(inode); 363778aeb42STyler Hicks } 364778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 365778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 366778aeb42STyler Hicks if (rc) { 367778aeb42STyler Hicks make_bad_inode(inode); 368778aeb42STyler Hicks return rc; 369778aeb42STyler Hicks } 370778aeb42STyler Hicks } 371778aeb42STyler Hicks 372778aeb42STyler Hicks if (inode->i_state & I_NEW) 373778aeb42STyler Hicks unlock_new_inode(inode); 374778aeb42STyler Hicks d_add(dentry, inode); 375778aeb42STyler Hicks 376addd65adSMichael Halcrow return rc; 377addd65adSMichael Halcrow } 378addd65adSMichael Halcrow 379addd65adSMichael Halcrow /** 380addd65adSMichael Halcrow * ecryptfs_lookup 381addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 382addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 38389076bc3SAl Viro * @flags: lookup flags 384addd65adSMichael Halcrow * 385addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 386addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 387addd65adSMichael Halcrow */ 388addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 389addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 39000cd8dd3SAl Viro unsigned int flags) 391addd65adSMichael Halcrow { 392addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 393a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 394addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 395addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 396addd65adSMichael Halcrow int rc = 0; 397addd65adSMichael Halcrow 398addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 3996b719e53SAl Viro lower_dentry = lookup_one_len_unlocked(ecryptfs_dentry->d_name.name, 4008787c7a3STyler Hicks lower_dir_dentry, 4018787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 402addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 403addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4048787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4059e78d14aSDavid Howells "[%d] on lower_dentry = [%pd]\n", __func__, rc, 4069e78d14aSDavid Howells ecryptfs_dentry); 407bc65a121SAl Viro goto out; 408addd65adSMichael Halcrow } 4092b0143b5SDavid Howells if (d_really_is_positive(lower_dentry)) 4105ccf9203STyler Hicks goto interpose; 411addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 412addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 4132aac0cf8STyler Hicks if (!(mount_crypt_stat 4142aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 4155ccf9203STyler Hicks goto interpose; 416addd65adSMichael Halcrow dput(lower_dentry); 417addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 418addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 41997c31606SAl Viro mount_crypt_stat, ecryptfs_dentry->d_name.name, 420addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 421addd65adSMichael Halcrow if (rc) { 422addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 423addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 424bc65a121SAl Viro goto out; 425addd65adSMichael Halcrow } 4266b719e53SAl Viro lower_dentry = lookup_one_len_unlocked(encrypted_and_encoded_name, 4278787c7a3STyler Hicks lower_dir_dentry, 4288787c7a3STyler Hicks encrypted_and_encoded_name_size); 429addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 430addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4318787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4329f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 433addd65adSMichael Halcrow encrypted_and_encoded_name); 434bc65a121SAl Viro goto out; 435addd65adSMichael Halcrow } 4365ccf9203STyler Hicks interpose: 4375ccf9203STyler Hicks rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, 43870b89021STyler Hicks ecryptfs_dir_inode); 439addd65adSMichael Halcrow out: 440addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 441237fead6SMichael Halcrow return ERR_PTR(rc); 442237fead6SMichael Halcrow } 443237fead6SMichael Halcrow 444237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 445237fead6SMichael Halcrow struct dentry *new_dentry) 446237fead6SMichael Halcrow { 447237fead6SMichael Halcrow struct dentry *lower_old_dentry; 448237fead6SMichael Halcrow struct dentry *lower_new_dentry; 449237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 450237fead6SMichael Halcrow u64 file_size_save; 451237fead6SMichael Halcrow int rc; 452237fead6SMichael Halcrow 4532b0143b5SDavid Howells file_size_save = i_size_read(d_inode(old_dentry)); 454237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 455237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 456237fead6SMichael Halcrow dget(lower_old_dentry); 457237fead6SMichael Halcrow dget(lower_new_dentry); 458237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 4592b0143b5SDavid Howells rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), 460146a8595SJ. Bruce Fields lower_new_dentry, NULL); 4612b0143b5SDavid Howells if (rc || d_really_is_negative(lower_new_dentry)) 462237fead6SMichael Halcrow goto out_lock; 4635ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 464237fead6SMichael Halcrow if (rc) 465237fead6SMichael Halcrow goto out_lock; 4662b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 4672b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 4682b0143b5SDavid Howells set_nlink(d_inode(old_dentry), 4692b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); 4702b0143b5SDavid Howells i_size_write(d_inode(new_dentry), file_size_save); 471237fead6SMichael Halcrow out_lock: 472237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 473237fead6SMichael Halcrow dput(lower_new_dentry); 474237fead6SMichael Halcrow dput(lower_old_dentry); 475237fead6SMichael Halcrow return rc; 476237fead6SMichael Halcrow } 477237fead6SMichael Halcrow 478237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 479237fead6SMichael Halcrow { 4802b0143b5SDavid Howells return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); 481237fead6SMichael Halcrow } 482237fead6SMichael Halcrow 483237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 484237fead6SMichael Halcrow const char *symname) 485237fead6SMichael Halcrow { 486237fead6SMichael Halcrow int rc; 487237fead6SMichael Halcrow struct dentry *lower_dentry; 488237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 489237fead6SMichael Halcrow char *encoded_symname; 490addd65adSMichael Halcrow size_t encoded_symlen; 491addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 492237fead6SMichael Halcrow 493237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 494237fead6SMichael Halcrow dget(lower_dentry); 495237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 496addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 497addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 498addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 499addd65adSMichael Halcrow &encoded_symlen, 500addd65adSMichael Halcrow mount_crypt_stat, symname, 501addd65adSMichael Halcrow strlen(symname)); 502addd65adSMichael Halcrow if (rc) 503237fead6SMichael Halcrow goto out_lock; 5042b0143b5SDavid Howells rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry, 505db2e747bSMiklos Szeredi encoded_symname); 506237fead6SMichael Halcrow kfree(encoded_symname); 5072b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 508237fead6SMichael Halcrow goto out_lock; 5095ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 510237fead6SMichael Halcrow if (rc) 511237fead6SMichael Halcrow goto out_lock; 5122b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5132b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 514237fead6SMichael Halcrow out_lock: 515237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 516237fead6SMichael Halcrow dput(lower_dentry); 5172b0143b5SDavid Howells if (d_really_is_negative(dentry)) 518237fead6SMichael Halcrow d_drop(dentry); 519237fead6SMichael Halcrow return rc; 520237fead6SMichael Halcrow } 521237fead6SMichael Halcrow 52218bb1db3SAl Viro static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 523237fead6SMichael Halcrow { 524237fead6SMichael Halcrow int rc; 525237fead6SMichael Halcrow struct dentry *lower_dentry; 526237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 527237fead6SMichael Halcrow 528237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 529237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 5302b0143b5SDavid Howells rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode); 5312b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 532237fead6SMichael Halcrow goto out; 5335ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 534237fead6SMichael Halcrow if (rc) 535237fead6SMichael Halcrow goto out; 5362b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5372b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 5382b0143b5SDavid Howells set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); 539237fead6SMichael Halcrow out: 540237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5412b0143b5SDavid Howells if (d_really_is_negative(dentry)) 542237fead6SMichael Halcrow d_drop(dentry); 543237fead6SMichael Halcrow return rc; 544237fead6SMichael Halcrow } 545237fead6SMichael Halcrow 546237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 547237fead6SMichael Halcrow { 548237fead6SMichael Halcrow struct dentry *lower_dentry; 549237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 55045ec4abaSMichael Halcrow int rc; 551237fead6SMichael Halcrow 552237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 55345ec4abaSMichael Halcrow dget(dentry); 554237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 55545ec4abaSMichael Halcrow dget(lower_dentry); 5562b0143b5SDavid Howells rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry); 55745ec4abaSMichael Halcrow dput(lower_dentry); 5582b0143b5SDavid Howells if (!rc && d_really_is_positive(dentry)) 5592b0143b5SDavid Howells clear_nlink(d_inode(dentry)); 5602b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5612b0143b5SDavid Howells set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); 562237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 563237fead6SMichael Halcrow if (!rc) 564237fead6SMichael Halcrow d_drop(dentry); 56545ec4abaSMichael Halcrow dput(dentry); 566237fead6SMichael Halcrow return rc; 567237fead6SMichael Halcrow } 568237fead6SMichael Halcrow 569237fead6SMichael Halcrow static int 5701a67aafbSAl Viro ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) 571237fead6SMichael Halcrow { 572237fead6SMichael Halcrow int rc; 573237fead6SMichael Halcrow struct dentry *lower_dentry; 574237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 575237fead6SMichael Halcrow 576237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 577237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 5782b0143b5SDavid Howells rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev); 5792b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 580237fead6SMichael Halcrow goto out; 5815ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 582237fead6SMichael Halcrow if (rc) 583237fead6SMichael Halcrow goto out; 5842b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5852b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 586237fead6SMichael Halcrow out: 587237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5882b0143b5SDavid Howells if (d_really_is_negative(dentry)) 589237fead6SMichael Halcrow d_drop(dentry); 590237fead6SMichael Halcrow return rc; 591237fead6SMichael Halcrow } 592237fead6SMichael Halcrow 593237fead6SMichael Halcrow static int 594237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 595237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 596237fead6SMichael Halcrow { 597237fead6SMichael Halcrow int rc; 598237fead6SMichael Halcrow struct dentry *lower_old_dentry; 599237fead6SMichael Halcrow struct dentry *lower_new_dentry; 600237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 601237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6020d132f73SErez Zadok struct dentry *trap = NULL; 6038335eafcSTyler Hicks struct inode *target_inode; 604237fead6SMichael Halcrow 605237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 606237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 607237fead6SMichael Halcrow dget(lower_old_dentry); 608237fead6SMichael Halcrow dget(lower_new_dentry); 609237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 610237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6112b0143b5SDavid Howells target_inode = d_inode(new_dentry); 6120d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6130d132f73SErez Zadok /* source should not be ancestor of target */ 6140d132f73SErez Zadok if (trap == lower_old_dentry) { 6150d132f73SErez Zadok rc = -EINVAL; 6160d132f73SErez Zadok goto out_lock; 6170d132f73SErez Zadok } 6180d132f73SErez Zadok /* target should not be ancestor of source */ 6190d132f73SErez Zadok if (trap == lower_new_dentry) { 6200d132f73SErez Zadok rc = -ENOTEMPTY; 6210d132f73SErez Zadok goto out_lock; 6220d132f73SErez Zadok } 6232b0143b5SDavid Howells rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, 6242b0143b5SDavid Howells d_inode(lower_new_dir_dentry), lower_new_dentry, 625520c8b16SMiklos Szeredi NULL, 0); 626237fead6SMichael Halcrow if (rc) 627237fead6SMichael Halcrow goto out_lock; 6288335eafcSTyler Hicks if (target_inode) 6298335eafcSTyler Hicks fsstack_copy_attr_all(target_inode, 6308335eafcSTyler Hicks ecryptfs_inode_to_lower(target_inode)); 6312b0143b5SDavid Howells fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); 632237fead6SMichael Halcrow if (new_dir != old_dir) 6332b0143b5SDavid Howells fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); 634237fead6SMichael Halcrow out_lock: 635237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 636dd55c898STyler Hicks dput(lower_new_dir_dentry); 637dd55c898STyler Hicks dput(lower_old_dir_dentry); 638237fead6SMichael Halcrow dput(lower_new_dentry); 639237fead6SMichael Halcrow dput(lower_old_dentry); 640237fead6SMichael Halcrow return rc; 641237fead6SMichael Halcrow } 642237fead6SMichael Halcrow 643b22e8fedSAl Viro static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) 644237fead6SMichael Halcrow { 6453a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 646237fead6SMichael Halcrow char *lower_buf; 647b22e8fedSAl Viro char *buf; 648addd65adSMichael Halcrow mm_segment_t old_fs; 649addd65adSMichael Halcrow int rc; 650237fead6SMichael Halcrow 651408bd629SAl Viro lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); 652b22e8fedSAl Viro if (!lower_buf) 653b22e8fedSAl Viro return ERR_PTR(-ENOMEM); 654237fead6SMichael Halcrow old_fs = get_fs(); 655237fead6SMichael Halcrow set_fs(get_ds()); 6562b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->readlink(lower_dentry, 657237fead6SMichael Halcrow (char __user *)lower_buf, 658408bd629SAl Viro PATH_MAX); 659237fead6SMichael Halcrow set_fs(old_fs); 6603a60a168STyler Hicks if (rc < 0) 6613a60a168STyler Hicks goto out; 662b22e8fedSAl Viro rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, 663408bd629SAl Viro lower_buf, rc); 6643a60a168STyler Hicks out: 665237fead6SMichael Halcrow kfree(lower_buf); 666b22e8fedSAl Viro return rc ? ERR_PTR(rc) : buf; 6673a60a168STyler Hicks } 6683a60a168STyler Hicks 6696b255391SAl Viro static const char *ecryptfs_get_link(struct dentry *dentry, 670fceef393SAl Viro struct inode *inode, 671fceef393SAl Viro struct delayed_call *done) 672237fead6SMichael Halcrow { 673b22e8fedSAl Viro size_t len; 6746b255391SAl Viro char *buf; 6756b255391SAl Viro 6766b255391SAl Viro if (!dentry) 6776b255391SAl Viro return ERR_PTR(-ECHILD); 6786b255391SAl Viro 6796b255391SAl Viro buf = ecryptfs_readlink_lower(dentry, &len); 680b22e8fedSAl Viro if (IS_ERR(buf)) 681680baacbSAl Viro return buf; 6822b0143b5SDavid Howells fsstack_copy_attr_atime(d_inode(dentry), 6832b0143b5SDavid Howells d_inode(ecryptfs_dentry_to_lower(dentry))); 684408bd629SAl Viro buf[len] = '\0'; 685fceef393SAl Viro set_delayed_call(done, kfree_link, buf); 686fceef393SAl Viro return buf; 687237fead6SMichael Halcrow } 688237fead6SMichael Halcrow 689237fead6SMichael Halcrow /** 690237fead6SMichael Halcrow * upper_size_to_lower_size 691237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 692237fead6SMichael Halcrow * @upper_size: Size of the upper file 693237fead6SMichael Halcrow * 694cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 695237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 696237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 697237fead6SMichael Halcrow * 698237fead6SMichael Halcrow * Returns Calculated size of the lower file. 699237fead6SMichael Halcrow */ 700237fead6SMichael Halcrow static loff_t 701237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 702237fead6SMichael Halcrow loff_t upper_size) 703237fead6SMichael Halcrow { 704237fead6SMichael Halcrow loff_t lower_size; 705237fead6SMichael Halcrow 706157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 707237fead6SMichael Halcrow if (upper_size != 0) { 708237fead6SMichael Halcrow loff_t num_extents; 709237fead6SMichael Halcrow 710237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 711237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 712237fead6SMichael Halcrow num_extents++; 713237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 714237fead6SMichael Halcrow } 715237fead6SMichael Halcrow return lower_size; 716237fead6SMichael Halcrow } 717237fead6SMichael Halcrow 718237fead6SMichael Halcrow /** 7195f3ef64fSTyler Hicks * truncate_upper 720237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7215f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7225f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 723237fead6SMichael Halcrow * 724237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 725237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7265f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7275f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7285f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7295f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7305f3ef64fSTyler Hicks * the truncation of the lower inode. 731237fead6SMichael Halcrow * 732237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 733237fead6SMichael Halcrow */ 7345f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7355f3ef64fSTyler Hicks struct iattr *lower_ia) 736237fead6SMichael Halcrow { 737237fead6SMichael Halcrow int rc = 0; 7382b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 739237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 740237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 741237fead6SMichael Halcrow loff_t lower_size_before_truncate; 742237fead6SMichael Halcrow loff_t lower_size_after_truncate; 743237fead6SMichael Halcrow 7445f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7455f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 746332ab16fSTyler Hicks return 0; 7475f3ef64fSTyler Hicks } 7483b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 749332ab16fSTyler Hicks if (rc) 750332ab16fSTyler Hicks return rc; 7512b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 752237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7535f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7542ed92554SMichael Halcrow char zero[] = { 0x00 }; 755240e2df5SMichael Halcrow 7565f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7572ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7582ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7592ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7602ed92554SMichael Halcrow * file and the new and of the file */ 76148c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7625f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7635f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7645f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7655f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 7665f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 7672ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 7682ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 7695f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 7702ed92554SMichael Halcrow 7712c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7722c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7735f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7745f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 77548c1e44aSAl Viro goto out; 77613a791b4STyler Hicks } 7772ed92554SMichael Halcrow if (num_zeros) { 7782ed92554SMichael Halcrow char *zeros_virt; 7792ed92554SMichael Halcrow 7802ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7812ed92554SMichael Halcrow if (!zeros_virt) { 7822ed92554SMichael Halcrow rc = -ENOMEM; 78348c1e44aSAl Viro goto out; 784240e2df5SMichael Halcrow } 78548c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 7865f3ef64fSTyler Hicks ia->ia_size, num_zeros); 7872ed92554SMichael Halcrow kfree(zeros_virt); 7885dda6992SMichael Halcrow if (rc) { 789240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 790240e2df5SMichael Halcrow "the remainder of the end page on " 791240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 79248c1e44aSAl Viro goto out; 793240e2df5SMichael Halcrow } 794240e2df5SMichael Halcrow } 7952c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7960216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 797dd2a3b7aSMichael Halcrow if (rc) { 798dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 799dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 800dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 80148c1e44aSAl Viro goto out; 802dd2a3b7aSMichael Halcrow } 803237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 804237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 805237fead6SMichael Halcrow lower_size_before_truncate = 806237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 807237fead6SMichael Halcrow lower_size_after_truncate = 8085f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8095f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8105f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8115f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8125f3ef64fSTyler Hicks } else 8135f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 814237fead6SMichael Halcrow } 815237fead6SMichael Halcrow out: 816332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 817237fead6SMichael Halcrow return rc; 818237fead6SMichael Halcrow } 819237fead6SMichael Halcrow 820a261a039STyler Hicks static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) 821a261a039STyler Hicks { 822a261a039STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 823a261a039STyler Hicks loff_t lower_oldsize, lower_newsize; 824a261a039STyler Hicks 825a261a039STyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 826a261a039STyler Hicks lower_oldsize = upper_size_to_lower_size(crypt_stat, 827a261a039STyler Hicks i_size_read(inode)); 828a261a039STyler Hicks lower_newsize = upper_size_to_lower_size(crypt_stat, offset); 829a261a039STyler Hicks if (lower_newsize > lower_oldsize) { 830a261a039STyler Hicks /* 831a261a039STyler Hicks * The eCryptfs inode and the new *lower* size are mixed here 832a261a039STyler Hicks * because we may not have the lower i_mutex held and/or it may 833a261a039STyler Hicks * not be appropriate to call inode_newsize_ok() with inodes 834a261a039STyler Hicks * from other filesystems. 835a261a039STyler Hicks */ 836a261a039STyler Hicks return inode_newsize_ok(inode, lower_newsize); 837a261a039STyler Hicks } 838a261a039STyler Hicks 839a261a039STyler Hicks return 0; 840a261a039STyler Hicks } 841a261a039STyler Hicks 8425f3ef64fSTyler Hicks /** 8435f3ef64fSTyler Hicks * ecryptfs_truncate 8445f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8455f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8465f3ef64fSTyler Hicks * 8475f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8485f3ef64fSTyler Hicks * its corresponding lower inode. 8495f3ef64fSTyler Hicks * 8505f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8515f3ef64fSTyler Hicks */ 8525f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8535f3ef64fSTyler Hicks { 8545f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8555f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8565f3ef64fSTyler Hicks int rc; 8575f3ef64fSTyler Hicks 8582b0143b5SDavid Howells rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); 859a261a039STyler Hicks if (rc) 860a261a039STyler Hicks return rc; 861a261a039STyler Hicks 8625f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8635f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8645f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8655f3ef64fSTyler Hicks 8665955102cSAl Viro inode_lock(d_inode(lower_dentry)); 86727ac0ffeSJ. Bruce Fields rc = notify_change(lower_dentry, &lower_ia, NULL); 8685955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 8695f3ef64fSTyler Hicks } 8705f3ef64fSTyler Hicks return rc; 8715f3ef64fSTyler Hicks } 8725f3ef64fSTyler Hicks 873237fead6SMichael Halcrow static int 87410556cb2SAl Viro ecryptfs_permission(struct inode *inode, int mask) 875237fead6SMichael Halcrow { 876f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 877237fead6SMichael Halcrow } 878237fead6SMichael Halcrow 879237fead6SMichael Halcrow /** 880237fead6SMichael Halcrow * ecryptfs_setattr 881237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 882237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 883237fead6SMichael Halcrow * 884237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 885237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 886237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 887237fead6SMichael Halcrow * 888237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 889237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 890237fead6SMichael Halcrow */ 891237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 892237fead6SMichael Halcrow { 893237fead6SMichael Halcrow int rc = 0; 894237fead6SMichael Halcrow struct dentry *lower_dentry; 8955f3ef64fSTyler Hicks struct iattr lower_ia; 896237fead6SMichael Halcrow struct inode *inode; 897237fead6SMichael Halcrow struct inode *lower_inode; 898237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 899237fead6SMichael Halcrow 9002b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 901e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 902e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 9032b0143b5SDavid Howells inode = d_inode(dentry); 904237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 905e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 906e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 907e36cb0b8SDavid Howells if (d_is_dir(dentry)) 908e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 909e36cb0b8SDavid Howells else if (d_is_reg(dentry) 91064ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 91164ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 912e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 913e10f281bSMichael Halcrow 914e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 915e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9163b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 917332ab16fSTyler Hicks if (rc) { 918332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 919332ab16fSTyler Hicks goto out; 920332ab16fSTyler Hicks } 921d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 922332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9235dda6992SMichael Halcrow if (rc) { 924e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 925e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 926e10f281bSMichael Halcrow rc = -EIO; 92725bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 928e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 92925bd8174SMichael Halcrow "or the key could not be retrieved. " 93025bd8174SMichael Halcrow "Plaintext passthrough mode is not " 931e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 932e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 933e10f281bSMichael Halcrow goto out; 934e10f281bSMichael Halcrow } 935e10f281bSMichael Halcrow rc = 0; 9363aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9373aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 938e10f281bSMichael Halcrow } 939e10f281bSMichael Halcrow } 940e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 941a261a039STyler Hicks 942a261a039STyler Hicks rc = inode_change_ok(inode, ia); 943a261a039STyler Hicks if (rc) 944a261a039STyler Hicks goto out; 945a261a039STyler Hicks if (ia->ia_valid & ATTR_SIZE) { 946a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); 947a261a039STyler Hicks if (rc) 948a261a039STyler Hicks goto out; 949a261a039STyler Hicks } 950a261a039STyler Hicks 9515f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9525f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9535f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 954237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9555f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 956237fead6SMichael Halcrow if (rc < 0) 957237fead6SMichael Halcrow goto out; 958237fead6SMichael Halcrow } 9591ac564ecSJeff Layton 9601ac564ecSJeff Layton /* 9611ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9621ac564ecSJeff Layton * to interpret this in its own way. 9631ac564ecSJeff Layton */ 9645f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9655f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9661ac564ecSJeff Layton 9675955102cSAl Viro inode_lock(d_inode(lower_dentry)); 96827ac0ffeSJ. Bruce Fields rc = notify_change(lower_dentry, &lower_ia, NULL); 9695955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 970237fead6SMichael Halcrow out: 9719afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 972237fead6SMichael Halcrow return rc; 973237fead6SMichael Halcrow } 974237fead6SMichael Halcrow 975111d61a2STyler Hicks static int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 9763a60a168STyler Hicks struct kstat *stat) 9773a60a168STyler Hicks { 9783a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9793a60a168STyler Hicks int rc = 0; 9803a60a168STyler Hicks 9813a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9823a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 9832b0143b5SDavid Howells generic_fillattr(d_inode(dentry), stat); 9843a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 9853a60a168STyler Hicks char *target; 9863a60a168STyler Hicks size_t targetsiz; 9873a60a168STyler Hicks 988b22e8fedSAl Viro target = ecryptfs_readlink_lower(dentry, &targetsiz); 989b22e8fedSAl Viro if (!IS_ERR(target)) { 9903a60a168STyler Hicks kfree(target); 9913a60a168STyler Hicks stat->size = targetsiz; 992b22e8fedSAl Viro } else { 993b22e8fedSAl Viro rc = PTR_ERR(target); 9943a60a168STyler Hicks } 9953a60a168STyler Hicks } 9963a60a168STyler Hicks return rc; 9973a60a168STyler Hicks } 9983a60a168STyler Hicks 999111d61a2STyler Hicks static int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1000f8f484d1STyler Hicks struct kstat *stat) 1001f8f484d1STyler Hicks { 1002f8f484d1STyler Hicks struct kstat lower_stat; 1003f8f484d1STyler Hicks int rc; 1004f8f484d1STyler Hicks 10053dadecceSAl Viro rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat); 1006f8f484d1STyler Hicks if (!rc) { 10072b0143b5SDavid Howells fsstack_copy_attr_all(d_inode(dentry), 10082b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(dentry))); 10092b0143b5SDavid Howells generic_fillattr(d_inode(dentry), stat); 1010f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1011f8f484d1STyler Hicks } 1012f8f484d1STyler Hicks return rc; 1013f8f484d1STyler Hicks } 1014f8f484d1STyler Hicks 1015dd2a3b7aSMichael Halcrow int 1016237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1017237fead6SMichael Halcrow size_t size, int flags) 1018237fead6SMichael Halcrow { 1019237fead6SMichael Halcrow int rc = 0; 1020237fead6SMichael Halcrow struct dentry *lower_dentry; 1021237fead6SMichael Halcrow 1022237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10232b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->setxattr) { 1024cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1025237fead6SMichael Halcrow goto out; 1026237fead6SMichael Halcrow } 102748b512e6SRoberto Sassu 102848b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 10292b0143b5SDavid Howells if (!rc && d_really_is_positive(dentry)) 10302b0143b5SDavid Howells fsstack_copy_attr_all(d_inode(dentry), d_inode(lower_dentry)); 1031237fead6SMichael Halcrow out: 1032237fead6SMichael Halcrow return rc; 1033237fead6SMichael Halcrow } 1034237fead6SMichael Halcrow 1035dd2a3b7aSMichael Halcrow ssize_t 1036ce23e640SAl Viro ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, 1037ce23e640SAl Viro const char *name, void *value, size_t size) 1038d7cdc5feSMichael Halcrow { 1039d7cdc5feSMichael Halcrow int rc = 0; 1040d7cdc5feSMichael Halcrow 1041ce23e640SAl Viro if (!lower_inode->i_op->getxattr) { 1042cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1043d7cdc5feSMichael Halcrow goto out; 1044d7cdc5feSMichael Halcrow } 1045ce23e640SAl Viro inode_lock(lower_inode); 1046ce23e640SAl Viro rc = lower_inode->i_op->getxattr(lower_dentry, lower_inode, 1047ce23e640SAl Viro name, value, size); 1048ce23e640SAl Viro inode_unlock(lower_inode); 1049d7cdc5feSMichael Halcrow out: 1050d7cdc5feSMichael Halcrow return rc; 1051d7cdc5feSMichael Halcrow } 1052d7cdc5feSMichael Halcrow 10537896b631SAdrian Bunk static ssize_t 1054ce23e640SAl Viro ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, 1055ce23e640SAl Viro const char *name, void *value, size_t size) 1056237fead6SMichael Halcrow { 1057ce23e640SAl Viro return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), 1058ce23e640SAl Viro ecryptfs_inode_to_lower(inode), 1059ce23e640SAl Viro name, value, size); 1060237fead6SMichael Halcrow } 1061237fead6SMichael Halcrow 1062237fead6SMichael Halcrow static ssize_t 1063237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1064237fead6SMichael Halcrow { 1065237fead6SMichael Halcrow int rc = 0; 1066237fead6SMichael Halcrow struct dentry *lower_dentry; 1067237fead6SMichael Halcrow 1068237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10692b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->listxattr) { 1070cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1071237fead6SMichael Halcrow goto out; 1072237fead6SMichael Halcrow } 10735955102cSAl Viro inode_lock(d_inode(lower_dentry)); 10742b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); 10755955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 1076237fead6SMichael Halcrow out: 1077237fead6SMichael Halcrow return rc; 1078237fead6SMichael Halcrow } 1079237fead6SMichael Halcrow 1080237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1081237fead6SMichael Halcrow { 1082237fead6SMichael Halcrow int rc = 0; 1083237fead6SMichael Halcrow struct dentry *lower_dentry; 1084237fead6SMichael Halcrow 1085237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10862b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->removexattr) { 1087cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1088237fead6SMichael Halcrow goto out; 1089237fead6SMichael Halcrow } 10905955102cSAl Viro inode_lock(d_inode(lower_dentry)); 10912b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->removexattr(lower_dentry, name); 10925955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 1093237fead6SMichael Halcrow out: 1094237fead6SMichael Halcrow return rc; 1095237fead6SMichael Halcrow } 1096237fead6SMichael Halcrow 1097754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1098408bd629SAl Viro .readlink = generic_readlink, 10996b255391SAl Viro .get_link = ecryptfs_get_link, 1100237fead6SMichael Halcrow .permission = ecryptfs_permission, 1101237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11023a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1103237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1104237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1105237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1106237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1107237fead6SMichael Halcrow }; 1108237fead6SMichael Halcrow 1109754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1110237fead6SMichael Halcrow .create = ecryptfs_create, 1111237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1112237fead6SMichael Halcrow .link = ecryptfs_link, 1113237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1114237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1115237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1116237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1117237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1118237fead6SMichael Halcrow .rename = ecryptfs_rename, 1119237fead6SMichael Halcrow .permission = ecryptfs_permission, 1120237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1121237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1122237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1123237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1124237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1125237fead6SMichael Halcrow }; 1126237fead6SMichael Halcrow 1127754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1128237fead6SMichael Halcrow .permission = ecryptfs_permission, 1129237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1130f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1131237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1132237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1133237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1134237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1135237fead6SMichael Halcrow }; 1136