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 */ 327b1168a92SAl Viro static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, 328b1168a92SAl Viro struct dentry *lower_dentry) 329778aeb42STyler Hicks { 3302b0143b5SDavid Howells struct inode *inode, *lower_inode = d_inode(lower_dentry); 331778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 332778aeb42STyler Hicks struct vfsmount *lower_mnt; 333778aeb42STyler Hicks int rc = 0; 334778aeb42STyler Hicks 335778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 336778aeb42STyler Hicks if (!dentry_info) { 337778aeb42STyler Hicks printk(KERN_ERR "%s: Out of memory whilst attempting " 338778aeb42STyler Hicks "to allocate ecryptfs_dentry_info struct\n", 339778aeb42STyler Hicks __func__); 340237fead6SMichael Halcrow dput(lower_dentry); 341b1168a92SAl Viro return ERR_PTR(-ENOMEM); 342778aeb42STyler Hicks } 3430b1d9011SAl Viro 3440b1d9011SAl Viro lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 345b1168a92SAl Viro fsstack_copy_attr_atime(d_inode(dentry->d_parent), 346b1168a92SAl Viro 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); 356b1168a92SAl Viro return NULL; 357778aeb42STyler Hicks } 358b1168a92SAl Viro inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb); 359778aeb42STyler Hicks if (IS_ERR(inode)) { 360778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 361778aeb42STyler Hicks __func__, PTR_ERR(inode)); 362b1168a92SAl Viro return ERR_CAST(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); 368b1168a92SAl Viro return ERR_PTR(rc); 369778aeb42STyler Hicks } 370778aeb42STyler Hicks } 371778aeb42STyler Hicks 372778aeb42STyler Hicks if (inode->i_state & I_NEW) 373778aeb42STyler Hicks unlock_new_inode(inode); 374b1168a92SAl Viro return d_splice_alias(inode, dentry); 375addd65adSMichael Halcrow } 376addd65adSMichael Halcrow 377addd65adSMichael Halcrow /** 378addd65adSMichael Halcrow * ecryptfs_lookup 379addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 380addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 38189076bc3SAl Viro * @flags: lookup flags 382addd65adSMichael Halcrow * 383addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 384addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 385addd65adSMichael Halcrow */ 386addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 387addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 38800cd8dd3SAl Viro unsigned int flags) 389addd65adSMichael Halcrow { 390addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 39188ae4ab9SAl Viro struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 392addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 39388ae4ab9SAl Viro const char *name = ecryptfs_dentry->d_name.name; 39488ae4ab9SAl Viro size_t len = ecryptfs_dentry->d_name.len; 395b1168a92SAl Viro struct dentry *res; 396addd65adSMichael Halcrow int rc = 0; 397addd65adSMichael Halcrow 398addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 39988ae4ab9SAl Viro 400addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 401addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 40288ae4ab9SAl Viro if (mount_crypt_stat 40388ae4ab9SAl Viro && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)) { 404addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 40588ae4ab9SAl Viro &encrypted_and_encoded_name, &len, 40688ae4ab9SAl Viro mount_crypt_stat, name, len); 407addd65adSMichael Halcrow if (rc) { 408addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 409addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 410237fead6SMichael Halcrow return ERR_PTR(rc); 411237fead6SMichael Halcrow } 41288ae4ab9SAl Viro name = encrypted_and_encoded_name; 41388ae4ab9SAl Viro } 41488ae4ab9SAl Viro 41588ae4ab9SAl Viro lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); 416237fead6SMichael Halcrow if (IS_ERR(lower_dentry)) { 417237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 418b1168a92SAl Viro "[%ld] on lower_dentry = [%s]\n", __func__, 419b1168a92SAl Viro PTR_ERR(lower_dentry), 42088ae4ab9SAl Viro name); 421b1168a92SAl Viro res = ERR_CAST(lower_dentry); 42288ae4ab9SAl Viro } else { 423b1168a92SAl Viro res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); 42488ae4ab9SAl Viro } 425237fead6SMichael Halcrow kfree(encrypted_and_encoded_name); 426b1168a92SAl Viro return res; 427237fead6SMichael Halcrow } 428237fead6SMichael Halcrow 429237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 430237fead6SMichael Halcrow struct dentry *new_dentry) 431237fead6SMichael Halcrow { 432237fead6SMichael Halcrow struct dentry *lower_old_dentry; 433237fead6SMichael Halcrow struct dentry *lower_new_dentry; 434237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 435237fead6SMichael Halcrow u64 file_size_save; 436237fead6SMichael Halcrow int rc; 437237fead6SMichael Halcrow 4382b0143b5SDavid Howells file_size_save = i_size_read(d_inode(old_dentry)); 439237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 440237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 441237fead6SMichael Halcrow dget(lower_old_dentry); 442237fead6SMichael Halcrow dget(lower_new_dentry); 443237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 4442b0143b5SDavid Howells rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), 445146a8595SJ. Bruce Fields lower_new_dentry, NULL); 4462b0143b5SDavid Howells if (rc || d_really_is_negative(lower_new_dentry)) 447237fead6SMichael Halcrow goto out_lock; 4485ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 449237fead6SMichael Halcrow if (rc) 450237fead6SMichael Halcrow goto out_lock; 4512b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 4522b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 4532b0143b5SDavid Howells set_nlink(d_inode(old_dentry), 4542b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); 4552b0143b5SDavid Howells i_size_write(d_inode(new_dentry), file_size_save); 456237fead6SMichael Halcrow out_lock: 457237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 458237fead6SMichael Halcrow dput(lower_new_dentry); 459237fead6SMichael Halcrow dput(lower_old_dentry); 460237fead6SMichael Halcrow return rc; 461237fead6SMichael Halcrow } 462237fead6SMichael Halcrow 463237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 464237fead6SMichael Halcrow { 4652b0143b5SDavid Howells return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); 466237fead6SMichael Halcrow } 467237fead6SMichael Halcrow 468237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 469237fead6SMichael Halcrow const char *symname) 470237fead6SMichael Halcrow { 471237fead6SMichael Halcrow int rc; 472237fead6SMichael Halcrow struct dentry *lower_dentry; 473237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 474237fead6SMichael Halcrow char *encoded_symname; 475addd65adSMichael Halcrow size_t encoded_symlen; 476addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 477237fead6SMichael Halcrow 478237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 479237fead6SMichael Halcrow dget(lower_dentry); 480237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 481addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 482addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 483addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 484addd65adSMichael Halcrow &encoded_symlen, 485addd65adSMichael Halcrow mount_crypt_stat, symname, 486addd65adSMichael Halcrow strlen(symname)); 487addd65adSMichael Halcrow if (rc) 488237fead6SMichael Halcrow goto out_lock; 4892b0143b5SDavid Howells rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry, 490db2e747bSMiklos Szeredi encoded_symname); 491237fead6SMichael Halcrow kfree(encoded_symname); 4922b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 493237fead6SMichael Halcrow goto out_lock; 4945ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 495237fead6SMichael Halcrow if (rc) 496237fead6SMichael Halcrow goto out_lock; 4972b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 4982b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 499237fead6SMichael Halcrow out_lock: 500237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 501237fead6SMichael Halcrow dput(lower_dentry); 5022b0143b5SDavid Howells if (d_really_is_negative(dentry)) 503237fead6SMichael Halcrow d_drop(dentry); 504237fead6SMichael Halcrow return rc; 505237fead6SMichael Halcrow } 506237fead6SMichael Halcrow 50718bb1db3SAl Viro static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 508237fead6SMichael Halcrow { 509237fead6SMichael Halcrow int rc; 510237fead6SMichael Halcrow struct dentry *lower_dentry; 511237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 512237fead6SMichael Halcrow 513237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 514237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 5152b0143b5SDavid Howells rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode); 5162b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 517237fead6SMichael Halcrow goto out; 5185ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 519237fead6SMichael Halcrow if (rc) 520237fead6SMichael Halcrow goto out; 5212b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5222b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 5232b0143b5SDavid Howells set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); 524237fead6SMichael Halcrow out: 525237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5262b0143b5SDavid Howells if (d_really_is_negative(dentry)) 527237fead6SMichael Halcrow d_drop(dentry); 528237fead6SMichael Halcrow return rc; 529237fead6SMichael Halcrow } 530237fead6SMichael Halcrow 531237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 532237fead6SMichael Halcrow { 533237fead6SMichael Halcrow struct dentry *lower_dentry; 534237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 53545ec4abaSMichael Halcrow int rc; 536237fead6SMichael Halcrow 537237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 53845ec4abaSMichael Halcrow dget(dentry); 539237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 54045ec4abaSMichael Halcrow dget(lower_dentry); 5412b0143b5SDavid Howells rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry); 54245ec4abaSMichael Halcrow dput(lower_dentry); 5432b0143b5SDavid Howells if (!rc && d_really_is_positive(dentry)) 5442b0143b5SDavid Howells clear_nlink(d_inode(dentry)); 5452b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5462b0143b5SDavid Howells set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); 547237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 548237fead6SMichael Halcrow if (!rc) 549237fead6SMichael Halcrow d_drop(dentry); 55045ec4abaSMichael Halcrow dput(dentry); 551237fead6SMichael Halcrow return rc; 552237fead6SMichael Halcrow } 553237fead6SMichael Halcrow 554237fead6SMichael Halcrow static int 5551a67aafbSAl Viro ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) 556237fead6SMichael Halcrow { 557237fead6SMichael Halcrow int rc; 558237fead6SMichael Halcrow struct dentry *lower_dentry; 559237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 560237fead6SMichael Halcrow 561237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 562237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 5632b0143b5SDavid Howells rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev); 5642b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 565237fead6SMichael Halcrow goto out; 5665ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 567237fead6SMichael Halcrow if (rc) 568237fead6SMichael Halcrow goto out; 5692b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5702b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 571237fead6SMichael Halcrow out: 572237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5732b0143b5SDavid Howells if (d_really_is_negative(dentry)) 574237fead6SMichael Halcrow d_drop(dentry); 575237fead6SMichael Halcrow return rc; 576237fead6SMichael Halcrow } 577237fead6SMichael Halcrow 578237fead6SMichael Halcrow static int 579237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 580237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 581237fead6SMichael Halcrow { 582237fead6SMichael Halcrow int rc; 583237fead6SMichael Halcrow struct dentry *lower_old_dentry; 584237fead6SMichael Halcrow struct dentry *lower_new_dentry; 585237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 586237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 5870d132f73SErez Zadok struct dentry *trap = NULL; 5888335eafcSTyler Hicks struct inode *target_inode; 589237fead6SMichael Halcrow 590237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 591237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 592237fead6SMichael Halcrow dget(lower_old_dentry); 593237fead6SMichael Halcrow dget(lower_new_dentry); 594237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 595237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 5962b0143b5SDavid Howells target_inode = d_inode(new_dentry); 5970d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 5980d132f73SErez Zadok /* source should not be ancestor of target */ 5990d132f73SErez Zadok if (trap == lower_old_dentry) { 6000d132f73SErez Zadok rc = -EINVAL; 6010d132f73SErez Zadok goto out_lock; 6020d132f73SErez Zadok } 6030d132f73SErez Zadok /* target should not be ancestor of source */ 6040d132f73SErez Zadok if (trap == lower_new_dentry) { 6050d132f73SErez Zadok rc = -ENOTEMPTY; 6060d132f73SErez Zadok goto out_lock; 6070d132f73SErez Zadok } 6082b0143b5SDavid Howells rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, 6092b0143b5SDavid Howells d_inode(lower_new_dir_dentry), lower_new_dentry, 610520c8b16SMiklos Szeredi NULL, 0); 611237fead6SMichael Halcrow if (rc) 612237fead6SMichael Halcrow goto out_lock; 6138335eafcSTyler Hicks if (target_inode) 6148335eafcSTyler Hicks fsstack_copy_attr_all(target_inode, 6158335eafcSTyler Hicks ecryptfs_inode_to_lower(target_inode)); 6162b0143b5SDavid Howells fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); 617237fead6SMichael Halcrow if (new_dir != old_dir) 6182b0143b5SDavid Howells fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); 619237fead6SMichael Halcrow out_lock: 620237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 621dd55c898STyler Hicks dput(lower_new_dir_dentry); 622dd55c898STyler Hicks dput(lower_old_dir_dentry); 623237fead6SMichael Halcrow dput(lower_new_dentry); 624237fead6SMichael Halcrow dput(lower_old_dentry); 625237fead6SMichael Halcrow return rc; 626237fead6SMichael Halcrow } 627237fead6SMichael Halcrow 628b22e8fedSAl Viro static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) 629237fead6SMichael Halcrow { 6303a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 631237fead6SMichael Halcrow char *lower_buf; 632b22e8fedSAl Viro char *buf; 633addd65adSMichael Halcrow mm_segment_t old_fs; 634addd65adSMichael Halcrow int rc; 635237fead6SMichael Halcrow 636408bd629SAl Viro lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); 637b22e8fedSAl Viro if (!lower_buf) 638b22e8fedSAl Viro return ERR_PTR(-ENOMEM); 639237fead6SMichael Halcrow old_fs = get_fs(); 640237fead6SMichael Halcrow set_fs(get_ds()); 6412b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->readlink(lower_dentry, 642237fead6SMichael Halcrow (char __user *)lower_buf, 643408bd629SAl Viro PATH_MAX); 644237fead6SMichael Halcrow set_fs(old_fs); 6453a60a168STyler Hicks if (rc < 0) 6463a60a168STyler Hicks goto out; 647b22e8fedSAl Viro rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, 648408bd629SAl Viro lower_buf, rc); 6493a60a168STyler Hicks out: 650237fead6SMichael Halcrow kfree(lower_buf); 651b22e8fedSAl Viro return rc ? ERR_PTR(rc) : buf; 6523a60a168STyler Hicks } 6533a60a168STyler Hicks 6546b255391SAl Viro static const char *ecryptfs_get_link(struct dentry *dentry, 655fceef393SAl Viro struct inode *inode, 656fceef393SAl Viro struct delayed_call *done) 657237fead6SMichael Halcrow { 658b22e8fedSAl Viro size_t len; 6596b255391SAl Viro char *buf; 6606b255391SAl Viro 6616b255391SAl Viro if (!dentry) 6626b255391SAl Viro return ERR_PTR(-ECHILD); 6636b255391SAl Viro 6646b255391SAl Viro buf = ecryptfs_readlink_lower(dentry, &len); 665b22e8fedSAl Viro if (IS_ERR(buf)) 666680baacbSAl Viro return buf; 6672b0143b5SDavid Howells fsstack_copy_attr_atime(d_inode(dentry), 6682b0143b5SDavid Howells d_inode(ecryptfs_dentry_to_lower(dentry))); 669408bd629SAl Viro buf[len] = '\0'; 670fceef393SAl Viro set_delayed_call(done, kfree_link, buf); 671fceef393SAl Viro return buf; 672237fead6SMichael Halcrow } 673237fead6SMichael Halcrow 674237fead6SMichael Halcrow /** 675237fead6SMichael Halcrow * upper_size_to_lower_size 676237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 677237fead6SMichael Halcrow * @upper_size: Size of the upper file 678237fead6SMichael Halcrow * 679cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 680237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 681237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 682237fead6SMichael Halcrow * 683237fead6SMichael Halcrow * Returns Calculated size of the lower file. 684237fead6SMichael Halcrow */ 685237fead6SMichael Halcrow static loff_t 686237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 687237fead6SMichael Halcrow loff_t upper_size) 688237fead6SMichael Halcrow { 689237fead6SMichael Halcrow loff_t lower_size; 690237fead6SMichael Halcrow 691157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 692237fead6SMichael Halcrow if (upper_size != 0) { 693237fead6SMichael Halcrow loff_t num_extents; 694237fead6SMichael Halcrow 695237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 696237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 697237fead6SMichael Halcrow num_extents++; 698237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 699237fead6SMichael Halcrow } 700237fead6SMichael Halcrow return lower_size; 701237fead6SMichael Halcrow } 702237fead6SMichael Halcrow 703237fead6SMichael Halcrow /** 7045f3ef64fSTyler Hicks * truncate_upper 705237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7065f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7075f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 708237fead6SMichael Halcrow * 709237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 710237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7115f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7125f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7135f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7145f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7155f3ef64fSTyler Hicks * the truncation of the lower inode. 716237fead6SMichael Halcrow * 717237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 718237fead6SMichael Halcrow */ 7195f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7205f3ef64fSTyler Hicks struct iattr *lower_ia) 721237fead6SMichael Halcrow { 722237fead6SMichael Halcrow int rc = 0; 7232b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 724237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 725237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 726237fead6SMichael Halcrow loff_t lower_size_before_truncate; 727237fead6SMichael Halcrow loff_t lower_size_after_truncate; 728237fead6SMichael Halcrow 7295f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7305f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 731332ab16fSTyler Hicks return 0; 7325f3ef64fSTyler Hicks } 7333b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 734332ab16fSTyler Hicks if (rc) 735332ab16fSTyler Hicks return rc; 7362b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 737237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7385f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7392ed92554SMichael Halcrow char zero[] = { 0x00 }; 740240e2df5SMichael Halcrow 7415f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7422ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7432ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7442ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7452ed92554SMichael Halcrow * file and the new and of the file */ 74648c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7475f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7485f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7495f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7505f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 751ea1754a0SKirill A. Shutemov * that page from (ia->ia_size & ~PAGE_MASK) to 752ea1754a0SKirill A. Shutemov * PAGE_SIZE with zeros. */ 75309cbfeafSKirill A. Shutemov size_t num_zeros = (PAGE_SIZE 75409cbfeafSKirill A. Shutemov - (ia->ia_size & ~PAGE_MASK)); 7552ed92554SMichael Halcrow 7562c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7572c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7585f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7595f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 76048c1e44aSAl Viro goto out; 76113a791b4STyler Hicks } 7622ed92554SMichael Halcrow if (num_zeros) { 7632ed92554SMichael Halcrow char *zeros_virt; 7642ed92554SMichael Halcrow 7652ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7662ed92554SMichael Halcrow if (!zeros_virt) { 7672ed92554SMichael Halcrow rc = -ENOMEM; 76848c1e44aSAl Viro goto out; 769240e2df5SMichael Halcrow } 77048c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 7715f3ef64fSTyler Hicks ia->ia_size, num_zeros); 7722ed92554SMichael Halcrow kfree(zeros_virt); 7735dda6992SMichael Halcrow if (rc) { 774240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 775240e2df5SMichael Halcrow "the remainder of the end page on " 776240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 77748c1e44aSAl Viro goto out; 778240e2df5SMichael Halcrow } 779240e2df5SMichael Halcrow } 7802c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7810216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 782dd2a3b7aSMichael Halcrow if (rc) { 783dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 784dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 785dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 78648c1e44aSAl Viro goto out; 787dd2a3b7aSMichael Halcrow } 788237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 789237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 790237fead6SMichael Halcrow lower_size_before_truncate = 791237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 792237fead6SMichael Halcrow lower_size_after_truncate = 7935f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 7945f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 7955f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 7965f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 7975f3ef64fSTyler Hicks } else 7985f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 799237fead6SMichael Halcrow } 800237fead6SMichael Halcrow out: 801332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 802237fead6SMichael Halcrow return rc; 803237fead6SMichael Halcrow } 804237fead6SMichael Halcrow 805a261a039STyler Hicks static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) 806a261a039STyler Hicks { 807a261a039STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 808a261a039STyler Hicks loff_t lower_oldsize, lower_newsize; 809a261a039STyler Hicks 810a261a039STyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 811a261a039STyler Hicks lower_oldsize = upper_size_to_lower_size(crypt_stat, 812a261a039STyler Hicks i_size_read(inode)); 813a261a039STyler Hicks lower_newsize = upper_size_to_lower_size(crypt_stat, offset); 814a261a039STyler Hicks if (lower_newsize > lower_oldsize) { 815a261a039STyler Hicks /* 816a261a039STyler Hicks * The eCryptfs inode and the new *lower* size are mixed here 817a261a039STyler Hicks * because we may not have the lower i_mutex held and/or it may 818a261a039STyler Hicks * not be appropriate to call inode_newsize_ok() with inodes 819a261a039STyler Hicks * from other filesystems. 820a261a039STyler Hicks */ 821a261a039STyler Hicks return inode_newsize_ok(inode, lower_newsize); 822a261a039STyler Hicks } 823a261a039STyler Hicks 824a261a039STyler Hicks return 0; 825a261a039STyler Hicks } 826a261a039STyler Hicks 8275f3ef64fSTyler Hicks /** 8285f3ef64fSTyler Hicks * ecryptfs_truncate 8295f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8305f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8315f3ef64fSTyler Hicks * 8325f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8335f3ef64fSTyler Hicks * its corresponding lower inode. 8345f3ef64fSTyler Hicks * 8355f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8365f3ef64fSTyler Hicks */ 8375f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8385f3ef64fSTyler Hicks { 8395f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8405f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8415f3ef64fSTyler Hicks int rc; 8425f3ef64fSTyler Hicks 8432b0143b5SDavid Howells rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); 844a261a039STyler Hicks if (rc) 845a261a039STyler Hicks return rc; 846a261a039STyler Hicks 8475f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8485f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8495f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8505f3ef64fSTyler Hicks 8515955102cSAl Viro inode_lock(d_inode(lower_dentry)); 85227ac0ffeSJ. Bruce Fields rc = notify_change(lower_dentry, &lower_ia, NULL); 8535955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 8545f3ef64fSTyler Hicks } 8555f3ef64fSTyler Hicks return rc; 8565f3ef64fSTyler Hicks } 8575f3ef64fSTyler Hicks 858237fead6SMichael Halcrow static int 85910556cb2SAl Viro ecryptfs_permission(struct inode *inode, int mask) 860237fead6SMichael Halcrow { 861f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 862237fead6SMichael Halcrow } 863237fead6SMichael Halcrow 864237fead6SMichael Halcrow /** 865237fead6SMichael Halcrow * ecryptfs_setattr 866237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 867237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 868237fead6SMichael Halcrow * 869237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 870237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 871237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 872237fead6SMichael Halcrow * 873237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 874237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 875237fead6SMichael Halcrow */ 876237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 877237fead6SMichael Halcrow { 878237fead6SMichael Halcrow int rc = 0; 879237fead6SMichael Halcrow struct dentry *lower_dentry; 8805f3ef64fSTyler Hicks struct iattr lower_ia; 881237fead6SMichael Halcrow struct inode *inode; 882237fead6SMichael Halcrow struct inode *lower_inode; 883237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 884237fead6SMichael Halcrow 8852b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 886e81f3340SHerbert Xu if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { 887e81f3340SHerbert Xu rc = ecryptfs_init_crypt_stat(crypt_stat); 888e81f3340SHerbert Xu if (rc) 889e81f3340SHerbert Xu return rc; 890e81f3340SHerbert Xu } 8912b0143b5SDavid Howells inode = d_inode(dentry); 892237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 893e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 894e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 895e36cb0b8SDavid Howells if (d_is_dir(dentry)) 896e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 897e36cb0b8SDavid Howells else if (d_is_reg(dentry) 89864ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 89964ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 900e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 901e10f281bSMichael Halcrow 902e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 903e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9043b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 905332ab16fSTyler Hicks if (rc) { 906332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 907332ab16fSTyler Hicks goto out; 908332ab16fSTyler Hicks } 909d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 910332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9115dda6992SMichael Halcrow if (rc) { 912e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 913e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 914e10f281bSMichael Halcrow rc = -EIO; 91525bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 916e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 91725bd8174SMichael Halcrow "or the key could not be retrieved. " 91825bd8174SMichael Halcrow "Plaintext passthrough mode is not " 919e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 920e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 921e10f281bSMichael Halcrow goto out; 922e10f281bSMichael Halcrow } 923e10f281bSMichael Halcrow rc = 0; 9243aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9253aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 926e10f281bSMichael Halcrow } 927e10f281bSMichael Halcrow } 928e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 929a261a039STyler Hicks 930a261a039STyler Hicks rc = inode_change_ok(inode, ia); 931a261a039STyler Hicks if (rc) 932a261a039STyler Hicks goto out; 933a261a039STyler Hicks if (ia->ia_valid & ATTR_SIZE) { 934a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); 935a261a039STyler Hicks if (rc) 936a261a039STyler Hicks goto out; 937a261a039STyler Hicks } 938a261a039STyler Hicks 9395f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9405f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9415f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 942237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9435f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 944237fead6SMichael Halcrow if (rc < 0) 945237fead6SMichael Halcrow goto out; 946237fead6SMichael Halcrow } 9471ac564ecSJeff Layton 9481ac564ecSJeff Layton /* 9491ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9501ac564ecSJeff Layton * to interpret this in its own way. 9511ac564ecSJeff Layton */ 9525f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9535f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9541ac564ecSJeff Layton 9555955102cSAl Viro inode_lock(d_inode(lower_dentry)); 95627ac0ffeSJ. Bruce Fields rc = notify_change(lower_dentry, &lower_ia, NULL); 9575955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 958237fead6SMichael Halcrow out: 9599afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 960237fead6SMichael Halcrow return rc; 961237fead6SMichael Halcrow } 962237fead6SMichael Halcrow 963111d61a2STyler Hicks static int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 9643a60a168STyler Hicks struct kstat *stat) 9653a60a168STyler Hicks { 9663a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9673a60a168STyler Hicks int rc = 0; 9683a60a168STyler Hicks 9693a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9703a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 9712b0143b5SDavid Howells generic_fillattr(d_inode(dentry), stat); 9723a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 9733a60a168STyler Hicks char *target; 9743a60a168STyler Hicks size_t targetsiz; 9753a60a168STyler Hicks 976b22e8fedSAl Viro target = ecryptfs_readlink_lower(dentry, &targetsiz); 977b22e8fedSAl Viro if (!IS_ERR(target)) { 9783a60a168STyler Hicks kfree(target); 9793a60a168STyler Hicks stat->size = targetsiz; 980b22e8fedSAl Viro } else { 981b22e8fedSAl Viro rc = PTR_ERR(target); 9823a60a168STyler Hicks } 9833a60a168STyler Hicks } 9843a60a168STyler Hicks return rc; 9853a60a168STyler Hicks } 9863a60a168STyler Hicks 987111d61a2STyler Hicks static int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 988f8f484d1STyler Hicks struct kstat *stat) 989f8f484d1STyler Hicks { 990f8f484d1STyler Hicks struct kstat lower_stat; 991f8f484d1STyler Hicks int rc; 992f8f484d1STyler Hicks 9933dadecceSAl Viro rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat); 994f8f484d1STyler Hicks if (!rc) { 9952b0143b5SDavid Howells fsstack_copy_attr_all(d_inode(dentry), 9962b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(dentry))); 9972b0143b5SDavid Howells generic_fillattr(d_inode(dentry), stat); 998f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 999f8f484d1STyler Hicks } 1000f8f484d1STyler Hicks return rc; 1001f8f484d1STyler Hicks } 1002f8f484d1STyler Hicks 1003dd2a3b7aSMichael Halcrow int 10043767e255SAl Viro ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, 10053767e255SAl Viro const char *name, const void *value, 1006237fead6SMichael Halcrow size_t size, int flags) 1007237fead6SMichael Halcrow { 1008237fead6SMichael Halcrow int rc = 0; 1009237fead6SMichael Halcrow struct dentry *lower_dentry; 1010237fead6SMichael Halcrow 1011237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10122b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->setxattr) { 1013cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1014237fead6SMichael Halcrow goto out; 1015237fead6SMichael Halcrow } 101648b512e6SRoberto Sassu 101748b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 10183767e255SAl Viro if (!rc && inode) 10193767e255SAl Viro fsstack_copy_attr_all(inode, d_inode(lower_dentry)); 1020237fead6SMichael Halcrow out: 1021237fead6SMichael Halcrow return rc; 1022237fead6SMichael Halcrow } 1023237fead6SMichael Halcrow 1024dd2a3b7aSMichael Halcrow ssize_t 1025ce23e640SAl Viro ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, 1026ce23e640SAl Viro const char *name, void *value, size_t size) 1027d7cdc5feSMichael Halcrow { 1028d7cdc5feSMichael Halcrow int rc = 0; 1029d7cdc5feSMichael Halcrow 1030ce23e640SAl Viro if (!lower_inode->i_op->getxattr) { 1031cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1032d7cdc5feSMichael Halcrow goto out; 1033d7cdc5feSMichael Halcrow } 1034ce23e640SAl Viro inode_lock(lower_inode); 1035ce23e640SAl Viro rc = lower_inode->i_op->getxattr(lower_dentry, lower_inode, 1036ce23e640SAl Viro name, value, size); 1037ce23e640SAl Viro inode_unlock(lower_inode); 1038d7cdc5feSMichael Halcrow out: 1039d7cdc5feSMichael Halcrow return rc; 1040d7cdc5feSMichael Halcrow } 1041d7cdc5feSMichael Halcrow 10427896b631SAdrian Bunk static ssize_t 1043ce23e640SAl Viro ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, 1044ce23e640SAl Viro const char *name, void *value, size_t size) 1045237fead6SMichael Halcrow { 1046ce23e640SAl Viro return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), 1047ce23e640SAl Viro ecryptfs_inode_to_lower(inode), 1048ce23e640SAl Viro name, value, size); 1049237fead6SMichael Halcrow } 1050237fead6SMichael Halcrow 1051237fead6SMichael Halcrow static ssize_t 1052237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1053237fead6SMichael Halcrow { 1054237fead6SMichael Halcrow int rc = 0; 1055237fead6SMichael Halcrow struct dentry *lower_dentry; 1056237fead6SMichael Halcrow 1057237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10582b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->listxattr) { 1059cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1060237fead6SMichael Halcrow goto out; 1061237fead6SMichael Halcrow } 10625955102cSAl Viro inode_lock(d_inode(lower_dentry)); 10632b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); 10645955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 1065237fead6SMichael Halcrow out: 1066237fead6SMichael Halcrow return rc; 1067237fead6SMichael Halcrow } 1068237fead6SMichael Halcrow 10694b899da5SAndreas Gruenbacher static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, 10704b899da5SAndreas Gruenbacher const char *name) 1071237fead6SMichael Halcrow { 1072237fead6SMichael Halcrow int rc = 0; 1073237fead6SMichael Halcrow struct dentry *lower_dentry; 10744b899da5SAndreas Gruenbacher struct inode *lower_inode; 1075237fead6SMichael Halcrow 1076237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10774b899da5SAndreas Gruenbacher lower_inode = ecryptfs_inode_to_lower(inode); 10784b899da5SAndreas Gruenbacher if (!lower_inode->i_op->removexattr) { 1079cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1080237fead6SMichael Halcrow goto out; 1081237fead6SMichael Halcrow } 10824b899da5SAndreas Gruenbacher inode_lock(lower_inode); 10834b899da5SAndreas Gruenbacher rc = lower_inode->i_op->removexattr(lower_dentry, name); 10844b899da5SAndreas Gruenbacher inode_unlock(lower_inode); 1085237fead6SMichael Halcrow out: 1086237fead6SMichael Halcrow return rc; 1087237fead6SMichael Halcrow } 1088237fead6SMichael Halcrow 1089754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1090408bd629SAl Viro .readlink = generic_readlink, 10916b255391SAl Viro .get_link = ecryptfs_get_link, 1092237fead6SMichael Halcrow .permission = ecryptfs_permission, 1093237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 10943a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 10954b899da5SAndreas Gruenbacher .setxattr = generic_setxattr, 10964b899da5SAndreas Gruenbacher .getxattr = generic_getxattr, 1097237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 10984b899da5SAndreas Gruenbacher .removexattr = generic_removexattr 1099237fead6SMichael Halcrow }; 1100237fead6SMichael Halcrow 1101754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1102237fead6SMichael Halcrow .create = ecryptfs_create, 1103237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1104237fead6SMichael Halcrow .link = ecryptfs_link, 1105237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1106237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1107237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1108237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1109237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1110237fead6SMichael Halcrow .rename = ecryptfs_rename, 1111237fead6SMichael Halcrow .permission = ecryptfs_permission, 1112237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11134b899da5SAndreas Gruenbacher .setxattr = generic_setxattr, 11144b899da5SAndreas Gruenbacher .getxattr = generic_getxattr, 1115237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 11164b899da5SAndreas Gruenbacher .removexattr = generic_removexattr 1117237fead6SMichael Halcrow }; 1118237fead6SMichael Halcrow 1119754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1120237fead6SMichael Halcrow .permission = ecryptfs_permission, 1121237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1122f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 11234b899da5SAndreas Gruenbacher .setxattr = generic_setxattr, 11244b899da5SAndreas Gruenbacher .getxattr = generic_getxattr, 1125237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 11264b899da5SAndreas Gruenbacher .removexattr = generic_removexattr 11274b899da5SAndreas Gruenbacher }; 11284b899da5SAndreas Gruenbacher 11294b899da5SAndreas Gruenbacher static int ecryptfs_xattr_get(const struct xattr_handler *handler, 11304b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11314b899da5SAndreas Gruenbacher const char *name, void *buffer, size_t size) 11324b899da5SAndreas Gruenbacher { 11334b899da5SAndreas Gruenbacher return ecryptfs_getxattr(dentry, inode, name, buffer, size); 11344b899da5SAndreas Gruenbacher } 11354b899da5SAndreas Gruenbacher 11364b899da5SAndreas Gruenbacher static int ecryptfs_xattr_set(const struct xattr_handler *handler, 11374b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11384b899da5SAndreas Gruenbacher const char *name, const void *value, size_t size, 11394b899da5SAndreas Gruenbacher int flags) 11404b899da5SAndreas Gruenbacher { 11414b899da5SAndreas Gruenbacher if (value) 11424b899da5SAndreas Gruenbacher return ecryptfs_setxattr(dentry, inode, name, value, size, flags); 11434b899da5SAndreas Gruenbacher else { 11444b899da5SAndreas Gruenbacher BUG_ON(flags != XATTR_REPLACE); 11454b899da5SAndreas Gruenbacher return ecryptfs_removexattr(dentry, inode, name); 11464b899da5SAndreas Gruenbacher } 11474b899da5SAndreas Gruenbacher } 11484b899da5SAndreas Gruenbacher 11494b899da5SAndreas Gruenbacher const struct xattr_handler ecryptfs_xattr_handler = { 11504b899da5SAndreas Gruenbacher .prefix = "", /* match anything */ 11514b899da5SAndreas Gruenbacher .get = ecryptfs_xattr_get, 11524b899da5SAndreas Gruenbacher .set = ecryptfs_xattr_set, 11534b899da5SAndreas Gruenbacher }; 11544b899da5SAndreas Gruenbacher 11554b899da5SAndreas Gruenbacher const struct xattr_handler *ecryptfs_xattr_handlers[] = { 11564b899da5SAndreas Gruenbacher &ecryptfs_xattr_handler, 11574b899da5SAndreas Gruenbacher NULL 1158237fead6SMichael Halcrow }; 1159