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_mapping->a_ops = &ecryptfs_aops; 685ccf9203STyler Hicks 695ccf9203STyler Hicks if (S_ISLNK(inode->i_mode)) 705ccf9203STyler Hicks inode->i_op = &ecryptfs_symlink_iops; 715ccf9203STyler Hicks else if (S_ISDIR(inode->i_mode)) 725ccf9203STyler Hicks inode->i_op = &ecryptfs_dir_iops; 735ccf9203STyler Hicks else 745ccf9203STyler Hicks inode->i_op = &ecryptfs_main_iops; 755ccf9203STyler Hicks 765ccf9203STyler Hicks if (S_ISDIR(inode->i_mode)) 775ccf9203STyler Hicks inode->i_fop = &ecryptfs_dir_fops; 785ccf9203STyler Hicks else if (special_file(inode->i_mode)) 795ccf9203STyler Hicks init_special_inode(inode, inode->i_mode, inode->i_rdev); 805ccf9203STyler Hicks else 815ccf9203STyler Hicks inode->i_fop = &ecryptfs_main_fops; 825ccf9203STyler Hicks 83c4f79073STyler Hicks return 0; 84c4f79073STyler Hicks } 85c4f79073STyler Hicks 865ccf9203STyler Hicks static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, 875ccf9203STyler Hicks struct super_block *sb) 885ccf9203STyler Hicks { 895ccf9203STyler Hicks struct inode *inode; 905ccf9203STyler Hicks 915ccf9203STyler Hicks if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) 925ccf9203STyler Hicks return ERR_PTR(-EXDEV); 935ccf9203STyler Hicks if (!igrab(lower_inode)) 945ccf9203STyler Hicks return ERR_PTR(-ESTALE); 955ccf9203STyler Hicks inode = iget5_locked(sb, (unsigned long)lower_inode, 965ccf9203STyler Hicks ecryptfs_inode_test, ecryptfs_inode_set, 975ccf9203STyler Hicks lower_inode); 985ccf9203STyler Hicks if (!inode) { 995ccf9203STyler Hicks iput(lower_inode); 1005ccf9203STyler Hicks return ERR_PTR(-EACCES); 1015ccf9203STyler Hicks } 1025ccf9203STyler Hicks if (!(inode->i_state & I_NEW)) 1035ccf9203STyler Hicks iput(lower_inode); 1045ccf9203STyler Hicks 1055ccf9203STyler Hicks return inode; 1065ccf9203STyler Hicks } 1075ccf9203STyler Hicks 108c4f79073STyler Hicks struct inode *ecryptfs_get_inode(struct inode *lower_inode, 109c4f79073STyler Hicks struct super_block *sb) 110c4f79073STyler Hicks { 1115ccf9203STyler Hicks struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); 112c4f79073STyler Hicks 1135ccf9203STyler Hicks if (!IS_ERR(inode) && (inode->i_state & I_NEW)) 114c4f79073STyler Hicks unlock_new_inode(inode); 1155ccf9203STyler Hicks 116c4f79073STyler Hicks return inode; 117c4f79073STyler Hicks } 118c4f79073STyler Hicks 119c4f79073STyler Hicks /** 120c4f79073STyler Hicks * ecryptfs_interpose 121c4f79073STyler Hicks * @lower_dentry: Existing dentry in the lower filesystem 122c4f79073STyler Hicks * @dentry: ecryptfs' dentry 123c4f79073STyler Hicks * @sb: ecryptfs's super_block 124c4f79073STyler Hicks * 125c4f79073STyler Hicks * Interposes upper and lower dentries. 126c4f79073STyler Hicks * 127c4f79073STyler Hicks * Returns zero on success; non-zero otherwise 128c4f79073STyler Hicks */ 129c4f79073STyler Hicks static int ecryptfs_interpose(struct dentry *lower_dentry, 1305ccf9203STyler Hicks struct dentry *dentry, struct super_block *sb) 131c4f79073STyler Hicks { 1322b0143b5SDavid Howells struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); 1335ccf9203STyler Hicks 134c4f79073STyler Hicks if (IS_ERR(inode)) 135c4f79073STyler Hicks return PTR_ERR(inode); 136c4f79073STyler Hicks d_instantiate(dentry, inode); 1375ccf9203STyler Hicks 138c4f79073STyler Hicks return 0; 139c4f79073STyler Hicks } 140c4f79073STyler Hicks 1418bc2d3cfSTyler Hicks static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, 1428bc2d3cfSTyler Hicks struct inode *inode) 1438bc2d3cfSTyler Hicks { 1448bc2d3cfSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 1458bc2d3cfSTyler Hicks struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 1468bc2d3cfSTyler Hicks struct dentry *lower_dir_dentry; 1478bc2d3cfSTyler Hicks int rc; 1488bc2d3cfSTyler Hicks 1498bc2d3cfSTyler Hicks dget(lower_dentry); 1508bc2d3cfSTyler Hicks lower_dir_dentry = lock_parent(lower_dentry); 151b21996e3SJ. Bruce Fields rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); 1528bc2d3cfSTyler Hicks if (rc) { 1538bc2d3cfSTyler Hicks printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 1548bc2d3cfSTyler Hicks goto out_unlock; 1558bc2d3cfSTyler Hicks } 1568bc2d3cfSTyler Hicks fsstack_copy_attr_times(dir, lower_dir_inode); 1578bc2d3cfSTyler Hicks set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); 1588bc2d3cfSTyler Hicks inode->i_ctime = dir->i_ctime; 1598bc2d3cfSTyler Hicks d_drop(dentry); 1608bc2d3cfSTyler Hicks out_unlock: 1618bc2d3cfSTyler Hicks unlock_dir(lower_dir_dentry); 1628bc2d3cfSTyler Hicks dput(lower_dentry); 1638bc2d3cfSTyler Hicks return rc; 1648bc2d3cfSTyler Hicks } 1658bc2d3cfSTyler Hicks 166237fead6SMichael Halcrow /** 167237fead6SMichael Halcrow * ecryptfs_do_create 168237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 169237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 170237fead6SMichael Halcrow * @mode: The mode of the new file 171237fead6SMichael Halcrow * 172237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 173237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 174237fead6SMichael Halcrow * stat of the lower directory inode. 175237fead6SMichael Halcrow * 176b59db43aSTyler Hicks * Returns the new eCryptfs inode on success; an ERR_PTR on error condition 177237fead6SMichael Halcrow */ 178b59db43aSTyler Hicks static struct inode * 179237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 180175a4eb7SAl Viro struct dentry *ecryptfs_dentry, umode_t mode) 181237fead6SMichael Halcrow { 182237fead6SMichael Halcrow int rc; 183237fead6SMichael Halcrow struct dentry *lower_dentry; 184237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 185b59db43aSTyler Hicks struct inode *inode; 186237fead6SMichael Halcrow 187237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 188237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 1892b0143b5SDavid Howells rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true); 1904981e081SMichael Halcrow if (rc) { 191caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 19218d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 193b59db43aSTyler Hicks inode = ERR_PTR(rc); 194237fead6SMichael Halcrow goto out_lock; 195237fead6SMichael Halcrow } 1962b0143b5SDavid Howells inode = __ecryptfs_get_inode(d_inode(lower_dentry), 1975ccf9203STyler Hicks directory_inode->i_sb); 1988bc2d3cfSTyler Hicks if (IS_ERR(inode)) { 1992b0143b5SDavid Howells vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL); 200237fead6SMichael Halcrow goto out_lock; 2018bc2d3cfSTyler Hicks } 2022b0143b5SDavid Howells fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); 2032b0143b5SDavid Howells fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); 204237fead6SMichael Halcrow out_lock: 205237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 206b59db43aSTyler Hicks return inode; 207237fead6SMichael Halcrow } 208237fead6SMichael Halcrow 209237fead6SMichael Halcrow /** 210237fead6SMichael Halcrow * ecryptfs_initialize_file 211237fead6SMichael Halcrow * 212237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 213237fead6SMichael Halcrow * file with a header and first data page. 214237fead6SMichael Halcrow * 215237fead6SMichael Halcrow * Returns zero on success 216237fead6SMichael Halcrow */ 217e3ccaa97STyler Hicks int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, 218b59db43aSTyler Hicks struct inode *ecryptfs_inode) 219237fead6SMichael Halcrow { 220d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 221b59db43aSTyler Hicks &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; 222237fead6SMichael Halcrow int rc = 0; 223237fead6SMichael Halcrow 224b59db43aSTyler Hicks if (S_ISDIR(ecryptfs_inode->i_mode)) { 225237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 226e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 227d7cdc5feSMichael Halcrow goto out; 228237fead6SMichael Halcrow } 229237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 230b59db43aSTyler Hicks rc = ecryptfs_new_file_context(ecryptfs_inode); 231237fead6SMichael Halcrow if (rc) { 232d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 233d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 234d7cdc5feSMichael Halcrow goto out; 235237fead6SMichael Halcrow } 236b59db43aSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); 237391b52f9SMichael Halcrow if (rc) { 238391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 239332ab16fSTyler Hicks "the lower file for the dentry with name " 2409e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2419e78d14aSDavid Howells ecryptfs_dentry, rc); 242391b52f9SMichael Halcrow goto out; 243391b52f9SMichael Halcrow } 244b59db43aSTyler Hicks rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); 245332ab16fSTyler Hicks if (rc) 246d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 247b59db43aSTyler Hicks ecryptfs_put_lower_file(ecryptfs_inode); 248237fead6SMichael Halcrow out: 249237fead6SMichael Halcrow return rc; 250237fead6SMichael Halcrow } 251237fead6SMichael Halcrow 252237fead6SMichael Halcrow /** 253237fead6SMichael Halcrow * ecryptfs_create 254237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 255237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 256237fead6SMichael Halcrow * @mode: The mode of the new file. 257237fead6SMichael Halcrow * 258237fead6SMichael Halcrow * Creates a new file. 259237fead6SMichael Halcrow * 260237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 261237fead6SMichael Halcrow */ 262237fead6SMichael Halcrow static int 263237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 264ebfc3b49SAl Viro umode_t mode, bool excl) 265237fead6SMichael Halcrow { 266b59db43aSTyler Hicks struct inode *ecryptfs_inode; 267237fead6SMichael Halcrow int rc; 268237fead6SMichael Halcrow 269b59db43aSTyler Hicks ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, 270b59db43aSTyler Hicks mode); 271a1c83681SViresh Kumar if (IS_ERR(ecryptfs_inode)) { 272237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 273237fead6SMichael Halcrow "lower filesystem\n"); 274b59db43aSTyler Hicks rc = PTR_ERR(ecryptfs_inode); 275237fead6SMichael Halcrow goto out; 276237fead6SMichael Halcrow } 277237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 278237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 279b59db43aSTyler Hicks rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); 280b59db43aSTyler Hicks if (rc) { 2818bc2d3cfSTyler Hicks ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, 2828bc2d3cfSTyler Hicks ecryptfs_inode); 2830e81ba23SAl Viro iget_failed(ecryptfs_inode); 284b59db43aSTyler Hicks goto out; 285b59db43aSTyler Hicks } 2861e2e547aSAl Viro d_instantiate_new(ecryptfs_dentry, ecryptfs_inode); 287237fead6SMichael Halcrow out: 288237fead6SMichael Halcrow return rc; 289237fead6SMichael Halcrow } 290237fead6SMichael Halcrow 291778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 292237fead6SMichael Halcrow { 2932aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 294778aeb42STyler Hicks int rc; 295237fead6SMichael Halcrow 296778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 297391b52f9SMichael Halcrow if (rc) { 298391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 299332ab16fSTyler Hicks "the lower file for the dentry with name " 3009e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 3019e78d14aSDavid Howells dentry, rc); 302778aeb42STyler Hicks return rc; 303391b52f9SMichael Halcrow } 304778aeb42STyler Hicks 3053b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 3062aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3072aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3082aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 309778aeb42STyler Hicks 310778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 311778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 312237fead6SMichael Halcrow if (rc) { 313778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 314778aeb42STyler Hicks if (!rc) 315dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 316dd2a3b7aSMichael Halcrow } 317778aeb42STyler Hicks 318778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 319778aeb42STyler Hicks return 0; 320778aeb42STyler Hicks } 321778aeb42STyler Hicks 322778aeb42STyler Hicks /** 323778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 324778aeb42STyler Hicks */ 325b1168a92SAl Viro static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, 326b1168a92SAl Viro struct dentry *lower_dentry) 327778aeb42STyler Hicks { 3282b0143b5SDavid Howells struct inode *inode, *lower_inode = d_inode(lower_dentry); 329778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 330778aeb42STyler Hicks struct vfsmount *lower_mnt; 331778aeb42STyler Hicks int rc = 0; 332778aeb42STyler Hicks 333778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 334778aeb42STyler Hicks if (!dentry_info) { 335237fead6SMichael Halcrow dput(lower_dentry); 336b1168a92SAl Viro return ERR_PTR(-ENOMEM); 337778aeb42STyler Hicks } 3380b1d9011SAl Viro 3390b1d9011SAl Viro lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 340b1168a92SAl Viro fsstack_copy_attr_atime(d_inode(dentry->d_parent), 341b1168a92SAl Viro d_inode(lower_dentry->d_parent)); 34284d08fa8SAl Viro BUG_ON(!d_count(lower_dentry)); 3430b1d9011SAl Viro 3440b1d9011SAl Viro ecryptfs_set_dentry_private(dentry, dentry_info); 34592dd1230SAl Viro dentry_info->lower_path.mnt = lower_mnt; 34692dd1230SAl Viro dentry_info->lower_path.dentry = lower_dentry; 347778aeb42STyler Hicks 3482b0143b5SDavid Howells if (d_really_is_negative(lower_dentry)) { 349778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 350778aeb42STyler Hicks d_add(dentry, NULL); 351b1168a92SAl Viro return NULL; 352778aeb42STyler Hicks } 353b1168a92SAl Viro inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb); 354778aeb42STyler Hicks if (IS_ERR(inode)) { 355778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 356778aeb42STyler Hicks __func__, PTR_ERR(inode)); 357b1168a92SAl Viro return ERR_CAST(inode); 358778aeb42STyler Hicks } 359778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 360778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 361778aeb42STyler Hicks if (rc) { 362778aeb42STyler Hicks make_bad_inode(inode); 363b1168a92SAl Viro return ERR_PTR(rc); 364778aeb42STyler Hicks } 365778aeb42STyler Hicks } 366778aeb42STyler Hicks 367778aeb42STyler Hicks if (inode->i_state & I_NEW) 368778aeb42STyler Hicks unlock_new_inode(inode); 369b1168a92SAl Viro return d_splice_alias(inode, dentry); 370addd65adSMichael Halcrow } 371addd65adSMichael Halcrow 372addd65adSMichael Halcrow /** 373addd65adSMichael Halcrow * ecryptfs_lookup 374addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 375addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 37689076bc3SAl Viro * @flags: lookup flags 377addd65adSMichael Halcrow * 378addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 379addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 380addd65adSMichael Halcrow */ 381addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 382addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 38300cd8dd3SAl Viro unsigned int flags) 384addd65adSMichael Halcrow { 385addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 38688ae4ab9SAl Viro struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 387addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 38888ae4ab9SAl Viro const char *name = ecryptfs_dentry->d_name.name; 38988ae4ab9SAl Viro size_t len = ecryptfs_dentry->d_name.len; 390b1168a92SAl Viro struct dentry *res; 391addd65adSMichael Halcrow int rc = 0; 392addd65adSMichael Halcrow 393addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 39488ae4ab9SAl Viro 395addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 396addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 397ab13a921SGuenter Roeck if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 398addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 39988ae4ab9SAl Viro &encrypted_and_encoded_name, &len, 40088ae4ab9SAl Viro mount_crypt_stat, name, len); 401addd65adSMichael Halcrow if (rc) { 402addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 403addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 404237fead6SMichael Halcrow return ERR_PTR(rc); 405237fead6SMichael Halcrow } 40688ae4ab9SAl Viro name = encrypted_and_encoded_name; 40788ae4ab9SAl Viro } 40888ae4ab9SAl Viro 40988ae4ab9SAl Viro lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); 410237fead6SMichael Halcrow if (IS_ERR(lower_dentry)) { 411237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 412b1168a92SAl Viro "[%ld] on lower_dentry = [%s]\n", __func__, 413b1168a92SAl Viro PTR_ERR(lower_dentry), 41488ae4ab9SAl Viro name); 415b1168a92SAl Viro res = ERR_CAST(lower_dentry); 41688ae4ab9SAl Viro } else { 417b1168a92SAl Viro res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); 41888ae4ab9SAl Viro } 419237fead6SMichael Halcrow kfree(encrypted_and_encoded_name); 420b1168a92SAl Viro return res; 421237fead6SMichael Halcrow } 422237fead6SMichael Halcrow 423237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 424237fead6SMichael Halcrow struct dentry *new_dentry) 425237fead6SMichael Halcrow { 426237fead6SMichael Halcrow struct dentry *lower_old_dentry; 427237fead6SMichael Halcrow struct dentry *lower_new_dentry; 428237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 429237fead6SMichael Halcrow u64 file_size_save; 430237fead6SMichael Halcrow int rc; 431237fead6SMichael Halcrow 4322b0143b5SDavid Howells file_size_save = i_size_read(d_inode(old_dentry)); 433237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 434237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 435237fead6SMichael Halcrow dget(lower_old_dentry); 436237fead6SMichael Halcrow dget(lower_new_dentry); 437237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 4382b0143b5SDavid Howells rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), 439146a8595SJ. Bruce Fields lower_new_dentry, NULL); 4402b0143b5SDavid Howells if (rc || d_really_is_negative(lower_new_dentry)) 441237fead6SMichael Halcrow goto out_lock; 4425ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 443237fead6SMichael Halcrow if (rc) 444237fead6SMichael Halcrow goto out_lock; 4452b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 4462b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 4472b0143b5SDavid Howells set_nlink(d_inode(old_dentry), 4482b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); 4492b0143b5SDavid Howells i_size_write(d_inode(new_dentry), file_size_save); 450237fead6SMichael Halcrow out_lock: 451237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 452237fead6SMichael Halcrow dput(lower_new_dentry); 453237fead6SMichael Halcrow dput(lower_old_dentry); 454237fead6SMichael Halcrow return rc; 455237fead6SMichael Halcrow } 456237fead6SMichael Halcrow 457237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 458237fead6SMichael Halcrow { 4592b0143b5SDavid Howells return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); 460237fead6SMichael Halcrow } 461237fead6SMichael Halcrow 462237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 463237fead6SMichael Halcrow const char *symname) 464237fead6SMichael Halcrow { 465237fead6SMichael Halcrow int rc; 466237fead6SMichael Halcrow struct dentry *lower_dentry; 467237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 468237fead6SMichael Halcrow char *encoded_symname; 469addd65adSMichael Halcrow size_t encoded_symlen; 470addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 471237fead6SMichael Halcrow 472237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 473237fead6SMichael Halcrow dget(lower_dentry); 474237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 475addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 476addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 477addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 478addd65adSMichael Halcrow &encoded_symlen, 479addd65adSMichael Halcrow mount_crypt_stat, symname, 480addd65adSMichael Halcrow strlen(symname)); 481addd65adSMichael Halcrow if (rc) 482237fead6SMichael Halcrow goto out_lock; 4832b0143b5SDavid Howells rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry, 484db2e747bSMiklos Szeredi encoded_symname); 485237fead6SMichael Halcrow kfree(encoded_symname); 4862b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 487237fead6SMichael Halcrow goto out_lock; 4885ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 489237fead6SMichael Halcrow if (rc) 490237fead6SMichael Halcrow goto out_lock; 4912b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 4922b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 493237fead6SMichael Halcrow out_lock: 494237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 495237fead6SMichael Halcrow dput(lower_dentry); 4962b0143b5SDavid Howells if (d_really_is_negative(dentry)) 497237fead6SMichael Halcrow d_drop(dentry); 498237fead6SMichael Halcrow return rc; 499237fead6SMichael Halcrow } 500237fead6SMichael Halcrow 50118bb1db3SAl Viro static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 502237fead6SMichael Halcrow { 503237fead6SMichael Halcrow int rc; 504237fead6SMichael Halcrow struct dentry *lower_dentry; 505237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 506237fead6SMichael Halcrow 507237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 508237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 5092b0143b5SDavid Howells rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode); 5102b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 511237fead6SMichael Halcrow goto out; 5125ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 513237fead6SMichael Halcrow if (rc) 514237fead6SMichael Halcrow goto out; 5152b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5162b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 5172b0143b5SDavid Howells set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); 518237fead6SMichael Halcrow out: 519237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5202b0143b5SDavid Howells if (d_really_is_negative(dentry)) 521237fead6SMichael Halcrow d_drop(dentry); 522237fead6SMichael Halcrow return rc; 523237fead6SMichael Halcrow } 524237fead6SMichael Halcrow 525237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 526237fead6SMichael Halcrow { 527237fead6SMichael Halcrow struct dentry *lower_dentry; 528237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 52945ec4abaSMichael Halcrow int rc; 530237fead6SMichael Halcrow 531237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 53245ec4abaSMichael Halcrow dget(dentry); 533237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 53445ec4abaSMichael Halcrow dget(lower_dentry); 5352b0143b5SDavid Howells rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry); 53645ec4abaSMichael Halcrow dput(lower_dentry); 5372b0143b5SDavid Howells if (!rc && d_really_is_positive(dentry)) 5382b0143b5SDavid Howells clear_nlink(d_inode(dentry)); 5392b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5402b0143b5SDavid Howells set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); 541237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 542237fead6SMichael Halcrow if (!rc) 543237fead6SMichael Halcrow d_drop(dentry); 54445ec4abaSMichael Halcrow dput(dentry); 545237fead6SMichael Halcrow return rc; 546237fead6SMichael Halcrow } 547237fead6SMichael Halcrow 548237fead6SMichael Halcrow static int 5491a67aafbSAl Viro ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) 550237fead6SMichael Halcrow { 551237fead6SMichael Halcrow int rc; 552237fead6SMichael Halcrow struct dentry *lower_dentry; 553237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 554237fead6SMichael Halcrow 555237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 556237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 5572b0143b5SDavid Howells rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev); 5582b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 559237fead6SMichael Halcrow goto out; 5605ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 561237fead6SMichael Halcrow if (rc) 562237fead6SMichael Halcrow goto out; 5632b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5642b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 565237fead6SMichael Halcrow out: 566237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5672b0143b5SDavid Howells if (d_really_is_negative(dentry)) 568237fead6SMichael Halcrow d_drop(dentry); 569237fead6SMichael Halcrow return rc; 570237fead6SMichael Halcrow } 571237fead6SMichael Halcrow 572237fead6SMichael Halcrow static int 573237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 5741cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 5751cd66c93SMiklos Szeredi unsigned int flags) 576237fead6SMichael Halcrow { 577237fead6SMichael Halcrow int rc; 578237fead6SMichael Halcrow struct dentry *lower_old_dentry; 579237fead6SMichael Halcrow struct dentry *lower_new_dentry; 580237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 581237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 5820d132f73SErez Zadok struct dentry *trap = NULL; 5838335eafcSTyler Hicks struct inode *target_inode; 584237fead6SMichael Halcrow 5851cd66c93SMiklos Szeredi if (flags) 5861cd66c93SMiklos Szeredi return -EINVAL; 5871cd66c93SMiklos Szeredi 588237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 589237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 590237fead6SMichael Halcrow dget(lower_old_dentry); 591237fead6SMichael Halcrow dget(lower_new_dentry); 592237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 593237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 5942b0143b5SDavid Howells target_inode = d_inode(new_dentry); 5950d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 5960d132f73SErez Zadok rc = -EINVAL; 59774dd7c97SAl Viro if (lower_old_dentry->d_parent != lower_old_dir_dentry) 5980d132f73SErez Zadok goto out_lock; 59974dd7c97SAl Viro if (lower_new_dentry->d_parent != lower_new_dir_dentry) 60074dd7c97SAl Viro goto out_lock; 60174dd7c97SAl Viro if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry)) 60274dd7c97SAl Viro goto out_lock; 60374dd7c97SAl Viro /* source should not be ancestor of target */ 60474dd7c97SAl Viro if (trap == lower_old_dentry) 60574dd7c97SAl Viro goto out_lock; 6060d132f73SErez Zadok /* target should not be ancestor of source */ 6070d132f73SErez Zadok if (trap == lower_new_dentry) { 6080d132f73SErez Zadok rc = -ENOTEMPTY; 6090d132f73SErez Zadok goto out_lock; 6100d132f73SErez Zadok } 6112b0143b5SDavid Howells rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, 6122b0143b5SDavid Howells d_inode(lower_new_dir_dentry), lower_new_dentry, 613520c8b16SMiklos Szeredi NULL, 0); 614237fead6SMichael Halcrow if (rc) 615237fead6SMichael Halcrow goto out_lock; 6168335eafcSTyler Hicks if (target_inode) 6178335eafcSTyler Hicks fsstack_copy_attr_all(target_inode, 6188335eafcSTyler Hicks ecryptfs_inode_to_lower(target_inode)); 6192b0143b5SDavid Howells fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); 620237fead6SMichael Halcrow if (new_dir != old_dir) 6212b0143b5SDavid Howells fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); 622237fead6SMichael Halcrow out_lock: 623237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 624dd55c898STyler Hicks dput(lower_new_dir_dentry); 625dd55c898STyler Hicks dput(lower_old_dir_dentry); 626237fead6SMichael Halcrow dput(lower_new_dentry); 627237fead6SMichael Halcrow dput(lower_old_dentry); 628237fead6SMichael Halcrow return rc; 629237fead6SMichael Halcrow } 630237fead6SMichael Halcrow 631b22e8fedSAl Viro static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) 632237fead6SMichael Halcrow { 6336c988f57SMiklos Szeredi DEFINE_DELAYED_CALL(done); 6343a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 6356c988f57SMiklos Szeredi const char *link; 636b22e8fedSAl Viro char *buf; 637addd65adSMichael Halcrow int rc; 638237fead6SMichael Halcrow 6396c988f57SMiklos Szeredi link = vfs_get_link(lower_dentry, &done); 6406c988f57SMiklos Szeredi if (IS_ERR(link)) 6416c988f57SMiklos Szeredi return ERR_CAST(link); 6426c988f57SMiklos Szeredi 643b22e8fedSAl Viro rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, 6446c988f57SMiklos Szeredi link, strlen(link)); 6456c988f57SMiklos Szeredi do_delayed_call(&done); 6466c988f57SMiklos Szeredi if (rc) 6476c988f57SMiklos Szeredi return ERR_PTR(rc); 6486c988f57SMiklos Szeredi 6496c988f57SMiklos Szeredi return buf; 6503a60a168STyler Hicks } 6513a60a168STyler Hicks 6526b255391SAl Viro static const char *ecryptfs_get_link(struct dentry *dentry, 653fceef393SAl Viro struct inode *inode, 654fceef393SAl Viro struct delayed_call *done) 655237fead6SMichael Halcrow { 656b22e8fedSAl Viro size_t len; 6576b255391SAl Viro char *buf; 6586b255391SAl Viro 6596b255391SAl Viro if (!dentry) 6606b255391SAl Viro return ERR_PTR(-ECHILD); 6616b255391SAl Viro 6626b255391SAl Viro buf = ecryptfs_readlink_lower(dentry, &len); 663b22e8fedSAl Viro if (IS_ERR(buf)) 664680baacbSAl Viro return buf; 6652b0143b5SDavid Howells fsstack_copy_attr_atime(d_inode(dentry), 6662b0143b5SDavid Howells d_inode(ecryptfs_dentry_to_lower(dentry))); 667408bd629SAl Viro buf[len] = '\0'; 668fceef393SAl Viro set_delayed_call(done, kfree_link, buf); 669fceef393SAl Viro return buf; 670237fead6SMichael Halcrow } 671237fead6SMichael Halcrow 672237fead6SMichael Halcrow /** 673237fead6SMichael Halcrow * upper_size_to_lower_size 674237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 675237fead6SMichael Halcrow * @upper_size: Size of the upper file 676237fead6SMichael Halcrow * 677cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 678237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 679237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 680237fead6SMichael Halcrow * 681237fead6SMichael Halcrow * Returns Calculated size of the lower file. 682237fead6SMichael Halcrow */ 683237fead6SMichael Halcrow static loff_t 684237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 685237fead6SMichael Halcrow loff_t upper_size) 686237fead6SMichael Halcrow { 687237fead6SMichael Halcrow loff_t lower_size; 688237fead6SMichael Halcrow 689157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 690237fead6SMichael Halcrow if (upper_size != 0) { 691237fead6SMichael Halcrow loff_t num_extents; 692237fead6SMichael Halcrow 693237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 694237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 695237fead6SMichael Halcrow num_extents++; 696237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 697237fead6SMichael Halcrow } 698237fead6SMichael Halcrow return lower_size; 699237fead6SMichael Halcrow } 700237fead6SMichael Halcrow 701237fead6SMichael Halcrow /** 7025f3ef64fSTyler Hicks * truncate_upper 703237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7045f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7055f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 706237fead6SMichael Halcrow * 707237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 708237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7095f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7105f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7115f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7125f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7135f3ef64fSTyler Hicks * the truncation of the lower inode. 714237fead6SMichael Halcrow * 715237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 716237fead6SMichael Halcrow */ 7175f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7185f3ef64fSTyler Hicks struct iattr *lower_ia) 719237fead6SMichael Halcrow { 720237fead6SMichael Halcrow int rc = 0; 7212b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 722237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 723237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 724237fead6SMichael Halcrow loff_t lower_size_before_truncate; 725237fead6SMichael Halcrow loff_t lower_size_after_truncate; 726237fead6SMichael Halcrow 7275f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7285f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 729332ab16fSTyler Hicks return 0; 7305f3ef64fSTyler Hicks } 7313b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 732332ab16fSTyler Hicks if (rc) 733332ab16fSTyler Hicks return rc; 7342b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 735237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7365f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7372ed92554SMichael Halcrow char zero[] = { 0x00 }; 738240e2df5SMichael Halcrow 7395f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7402ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7412ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7422ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7432ed92554SMichael Halcrow * file and the new and of the file */ 74448c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7455f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7465f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7475f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7485f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 749ea1754a0SKirill A. Shutemov * that page from (ia->ia_size & ~PAGE_MASK) to 750ea1754a0SKirill A. Shutemov * PAGE_SIZE with zeros. */ 75109cbfeafSKirill A. Shutemov size_t num_zeros = (PAGE_SIZE 75209cbfeafSKirill A. Shutemov - (ia->ia_size & ~PAGE_MASK)); 7532ed92554SMichael Halcrow 7542c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7552c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7565f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7575f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 75848c1e44aSAl Viro goto out; 75913a791b4STyler Hicks } 7602ed92554SMichael Halcrow if (num_zeros) { 7612ed92554SMichael Halcrow char *zeros_virt; 7622ed92554SMichael Halcrow 7632ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7642ed92554SMichael Halcrow if (!zeros_virt) { 7652ed92554SMichael Halcrow rc = -ENOMEM; 76648c1e44aSAl Viro goto out; 767240e2df5SMichael Halcrow } 76848c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 7695f3ef64fSTyler Hicks ia->ia_size, num_zeros); 7702ed92554SMichael Halcrow kfree(zeros_virt); 7715dda6992SMichael Halcrow if (rc) { 772240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 773240e2df5SMichael Halcrow "the remainder of the end page on " 774240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 77548c1e44aSAl Viro goto out; 776240e2df5SMichael Halcrow } 777240e2df5SMichael Halcrow } 7782c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7790216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 780dd2a3b7aSMichael Halcrow if (rc) { 781dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 782dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 783dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 78448c1e44aSAl Viro goto out; 785dd2a3b7aSMichael Halcrow } 786237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 787237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 788237fead6SMichael Halcrow lower_size_before_truncate = 789237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 790237fead6SMichael Halcrow lower_size_after_truncate = 7915f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 7925f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 7935f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 7945f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 7955f3ef64fSTyler Hicks } else 7965f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 797237fead6SMichael Halcrow } 798237fead6SMichael Halcrow out: 799332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 800237fead6SMichael Halcrow return rc; 801237fead6SMichael Halcrow } 802237fead6SMichael Halcrow 803a261a039STyler Hicks static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) 804a261a039STyler Hicks { 805a261a039STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 806a261a039STyler Hicks loff_t lower_oldsize, lower_newsize; 807a261a039STyler Hicks 808a261a039STyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 809a261a039STyler Hicks lower_oldsize = upper_size_to_lower_size(crypt_stat, 810a261a039STyler Hicks i_size_read(inode)); 811a261a039STyler Hicks lower_newsize = upper_size_to_lower_size(crypt_stat, offset); 812a261a039STyler Hicks if (lower_newsize > lower_oldsize) { 813a261a039STyler Hicks /* 814a261a039STyler Hicks * The eCryptfs inode and the new *lower* size are mixed here 815a261a039STyler Hicks * because we may not have the lower i_mutex held and/or it may 816a261a039STyler Hicks * not be appropriate to call inode_newsize_ok() with inodes 817a261a039STyler Hicks * from other filesystems. 818a261a039STyler Hicks */ 819a261a039STyler Hicks return inode_newsize_ok(inode, lower_newsize); 820a261a039STyler Hicks } 821a261a039STyler Hicks 822a261a039STyler Hicks return 0; 823a261a039STyler Hicks } 824a261a039STyler Hicks 8255f3ef64fSTyler Hicks /** 8265f3ef64fSTyler Hicks * ecryptfs_truncate 8275f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8285f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8295f3ef64fSTyler Hicks * 8305f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8315f3ef64fSTyler Hicks * its corresponding lower inode. 8325f3ef64fSTyler Hicks * 8335f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8345f3ef64fSTyler Hicks */ 8355f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8365f3ef64fSTyler Hicks { 8375f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8385f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8395f3ef64fSTyler Hicks int rc; 8405f3ef64fSTyler Hicks 8412b0143b5SDavid Howells rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); 842a261a039STyler Hicks if (rc) 843a261a039STyler Hicks return rc; 844a261a039STyler Hicks 8455f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8465f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8475f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8485f3ef64fSTyler Hicks 8495955102cSAl Viro inode_lock(d_inode(lower_dentry)); 85027ac0ffeSJ. Bruce Fields rc = notify_change(lower_dentry, &lower_ia, NULL); 8515955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 8525f3ef64fSTyler Hicks } 8535f3ef64fSTyler Hicks return rc; 8545f3ef64fSTyler Hicks } 8555f3ef64fSTyler Hicks 856237fead6SMichael Halcrow static int 85710556cb2SAl Viro ecryptfs_permission(struct inode *inode, int mask) 858237fead6SMichael Halcrow { 859f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 860237fead6SMichael Halcrow } 861237fead6SMichael Halcrow 862237fead6SMichael Halcrow /** 863237fead6SMichael Halcrow * ecryptfs_setattr 864237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 865237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 866237fead6SMichael Halcrow * 867237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 868237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 869237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 870237fead6SMichael Halcrow * 871237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 872237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 873237fead6SMichael Halcrow */ 874237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 875237fead6SMichael Halcrow { 876237fead6SMichael Halcrow int rc = 0; 877237fead6SMichael Halcrow struct dentry *lower_dentry; 8785f3ef64fSTyler Hicks struct iattr lower_ia; 879237fead6SMichael Halcrow struct inode *inode; 880237fead6SMichael Halcrow struct inode *lower_inode; 881237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 882237fead6SMichael Halcrow 8832b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 884e81f3340SHerbert Xu if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { 885e81f3340SHerbert Xu rc = ecryptfs_init_crypt_stat(crypt_stat); 886e81f3340SHerbert Xu if (rc) 887e81f3340SHerbert Xu return rc; 888e81f3340SHerbert Xu } 8892b0143b5SDavid Howells inode = d_inode(dentry); 890237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 891e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 892e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 893e36cb0b8SDavid Howells if (d_is_dir(dentry)) 894e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 895e36cb0b8SDavid Howells else if (d_is_reg(dentry) 89664ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 89764ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 898e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 899e10f281bSMichael Halcrow 900e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 901e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9023b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 903332ab16fSTyler Hicks if (rc) { 904332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 905332ab16fSTyler Hicks goto out; 906332ab16fSTyler Hicks } 907d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 908332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9095dda6992SMichael Halcrow if (rc) { 910e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 911e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 912e10f281bSMichael Halcrow rc = -EIO; 91325bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 914e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 91525bd8174SMichael Halcrow "or the key could not be retrieved. " 91625bd8174SMichael Halcrow "Plaintext passthrough mode is not " 917e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 918e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 919e10f281bSMichael Halcrow goto out; 920e10f281bSMichael Halcrow } 921e10f281bSMichael Halcrow rc = 0; 9223aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9233aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 924e10f281bSMichael Halcrow } 925e10f281bSMichael Halcrow } 926e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 927a261a039STyler Hicks 92831051c85SJan Kara rc = setattr_prepare(dentry, ia); 929a261a039STyler Hicks if (rc) 930a261a039STyler Hicks goto out; 931a261a039STyler Hicks if (ia->ia_valid & ATTR_SIZE) { 932a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); 933a261a039STyler Hicks if (rc) 934a261a039STyler Hicks goto out; 935a261a039STyler Hicks } 936a261a039STyler Hicks 9375f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9385f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9395f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 940237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9415f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 942237fead6SMichael Halcrow if (rc < 0) 943237fead6SMichael Halcrow goto out; 944237fead6SMichael Halcrow } 9451ac564ecSJeff Layton 9461ac564ecSJeff Layton /* 9471ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9481ac564ecSJeff Layton * to interpret this in its own way. 9491ac564ecSJeff Layton */ 9505f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9515f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9521ac564ecSJeff Layton 9535955102cSAl Viro inode_lock(d_inode(lower_dentry)); 95427ac0ffeSJ. Bruce Fields rc = notify_change(lower_dentry, &lower_ia, NULL); 9555955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 956237fead6SMichael Halcrow out: 9579afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 958237fead6SMichael Halcrow return rc; 959237fead6SMichael Halcrow } 960237fead6SMichael Halcrow 961a528d35eSDavid Howells static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat, 962a528d35eSDavid Howells u32 request_mask, unsigned int flags) 9633a60a168STyler Hicks { 964a528d35eSDavid Howells struct dentry *dentry = path->dentry; 9653a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9663a60a168STyler Hicks int rc = 0; 9673a60a168STyler Hicks 9683a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9693a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 9702b0143b5SDavid Howells generic_fillattr(d_inode(dentry), stat); 9713a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 9723a60a168STyler Hicks char *target; 9733a60a168STyler Hicks size_t targetsiz; 9743a60a168STyler Hicks 975b22e8fedSAl Viro target = ecryptfs_readlink_lower(dentry, &targetsiz); 976b22e8fedSAl Viro if (!IS_ERR(target)) { 9773a60a168STyler Hicks kfree(target); 9783a60a168STyler Hicks stat->size = targetsiz; 979b22e8fedSAl Viro } else { 980b22e8fedSAl Viro rc = PTR_ERR(target); 9813a60a168STyler Hicks } 9823a60a168STyler Hicks } 9833a60a168STyler Hicks return rc; 9843a60a168STyler Hicks } 9853a60a168STyler Hicks 986a528d35eSDavid Howells static int ecryptfs_getattr(const struct path *path, struct kstat *stat, 987a528d35eSDavid Howells u32 request_mask, unsigned int flags) 988f8f484d1STyler Hicks { 989a528d35eSDavid Howells struct dentry *dentry = path->dentry; 990f8f484d1STyler Hicks struct kstat lower_stat; 991f8f484d1STyler Hicks int rc; 992f8f484d1STyler Hicks 993a528d35eSDavid Howells rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat, 994a528d35eSDavid Howells request_mask, flags); 995f8f484d1STyler Hicks if (!rc) { 9962b0143b5SDavid Howells fsstack_copy_attr_all(d_inode(dentry), 9972b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(dentry))); 9982b0143b5SDavid Howells generic_fillattr(d_inode(dentry), stat); 999f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1000f8f484d1STyler Hicks } 1001f8f484d1STyler Hicks return rc; 1002f8f484d1STyler Hicks } 1003f8f484d1STyler Hicks 1004dd2a3b7aSMichael Halcrow int 10053767e255SAl Viro ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, 10063767e255SAl Viro const char *name, const void *value, 1007237fead6SMichael Halcrow size_t size, int flags) 1008237fead6SMichael Halcrow { 10095d6c3191SAndreas Gruenbacher int rc; 1010237fead6SMichael Halcrow struct dentry *lower_dentry; 1011237fead6SMichael Halcrow 1012237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10135d6c3191SAndreas Gruenbacher if (!(d_inode(lower_dentry)->i_opflags & IOP_XATTR)) { 1014cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1015237fead6SMichael Halcrow goto out; 1016237fead6SMichael Halcrow } 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 { 10285d6c3191SAndreas Gruenbacher int rc; 1029d7cdc5feSMichael Halcrow 10305d6c3191SAndreas Gruenbacher if (!(lower_inode->i_opflags & IOP_XATTR)) { 1031cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1032d7cdc5feSMichael Halcrow goto out; 1033d7cdc5feSMichael Halcrow } 1034ce23e640SAl Viro inode_lock(lower_inode); 10355d6c3191SAndreas Gruenbacher rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size); 1036ce23e640SAl Viro inode_unlock(lower_inode); 1037d7cdc5feSMichael Halcrow out: 1038d7cdc5feSMichael Halcrow return rc; 1039d7cdc5feSMichael Halcrow } 1040d7cdc5feSMichael Halcrow 10417896b631SAdrian Bunk static ssize_t 1042ce23e640SAl Viro ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, 1043ce23e640SAl Viro const char *name, void *value, size_t size) 1044237fead6SMichael Halcrow { 1045ce23e640SAl Viro return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), 1046ce23e640SAl Viro ecryptfs_inode_to_lower(inode), 1047ce23e640SAl Viro name, value, size); 1048237fead6SMichael Halcrow } 1049237fead6SMichael Halcrow 1050237fead6SMichael Halcrow static ssize_t 1051237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1052237fead6SMichael Halcrow { 1053237fead6SMichael Halcrow int rc = 0; 1054237fead6SMichael Halcrow struct dentry *lower_dentry; 1055237fead6SMichael Halcrow 1056237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10572b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->listxattr) { 1058cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1059237fead6SMichael Halcrow goto out; 1060237fead6SMichael Halcrow } 10615955102cSAl Viro inode_lock(d_inode(lower_dentry)); 10622b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); 10635955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 1064237fead6SMichael Halcrow out: 1065237fead6SMichael Halcrow return rc; 1066237fead6SMichael Halcrow } 1067237fead6SMichael Halcrow 10684b899da5SAndreas Gruenbacher static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, 10694b899da5SAndreas Gruenbacher const char *name) 1070237fead6SMichael Halcrow { 10715d6c3191SAndreas Gruenbacher int rc; 1072237fead6SMichael Halcrow struct dentry *lower_dentry; 10734b899da5SAndreas Gruenbacher struct inode *lower_inode; 1074237fead6SMichael Halcrow 1075237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10764b899da5SAndreas Gruenbacher lower_inode = ecryptfs_inode_to_lower(inode); 10775d6c3191SAndreas Gruenbacher if (!(lower_inode->i_opflags & IOP_XATTR)) { 1078cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1079237fead6SMichael Halcrow goto out; 1080237fead6SMichael Halcrow } 10814b899da5SAndreas Gruenbacher inode_lock(lower_inode); 10825d6c3191SAndreas Gruenbacher rc = __vfs_removexattr(lower_dentry, name); 10834b899da5SAndreas Gruenbacher inode_unlock(lower_inode); 1084237fead6SMichael Halcrow out: 1085237fead6SMichael Halcrow return rc; 1086237fead6SMichael Halcrow } 1087237fead6SMichael Halcrow 1088754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 10896b255391SAl Viro .get_link = ecryptfs_get_link, 1090237fead6SMichael Halcrow .permission = ecryptfs_permission, 1091237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 10923a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1093237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1094237fead6SMichael Halcrow }; 1095237fead6SMichael Halcrow 1096754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1097237fead6SMichael Halcrow .create = ecryptfs_create, 1098237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1099237fead6SMichael Halcrow .link = ecryptfs_link, 1100237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1101237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1102237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1103237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1104237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1105237fead6SMichael Halcrow .rename = ecryptfs_rename, 1106237fead6SMichael Halcrow .permission = ecryptfs_permission, 1107237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1108237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1109237fead6SMichael Halcrow }; 1110237fead6SMichael Halcrow 1111754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1112237fead6SMichael Halcrow .permission = ecryptfs_permission, 1113237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1114f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1115237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 11164b899da5SAndreas Gruenbacher }; 11174b899da5SAndreas Gruenbacher 11184b899da5SAndreas Gruenbacher static int ecryptfs_xattr_get(const struct xattr_handler *handler, 11194b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11204b899da5SAndreas Gruenbacher const char *name, void *buffer, size_t size) 11214b899da5SAndreas Gruenbacher { 11224b899da5SAndreas Gruenbacher return ecryptfs_getxattr(dentry, inode, name, buffer, size); 11234b899da5SAndreas Gruenbacher } 11244b899da5SAndreas Gruenbacher 11254b899da5SAndreas Gruenbacher static int ecryptfs_xattr_set(const struct xattr_handler *handler, 11264b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11274b899da5SAndreas Gruenbacher const char *name, const void *value, size_t size, 11284b899da5SAndreas Gruenbacher int flags) 11294b899da5SAndreas Gruenbacher { 11304b899da5SAndreas Gruenbacher if (value) 11314b899da5SAndreas Gruenbacher return ecryptfs_setxattr(dentry, inode, name, value, size, flags); 11324b899da5SAndreas Gruenbacher else { 11334b899da5SAndreas Gruenbacher BUG_ON(flags != XATTR_REPLACE); 11344b899da5SAndreas Gruenbacher return ecryptfs_removexattr(dentry, inode, name); 11354b899da5SAndreas Gruenbacher } 11364b899da5SAndreas Gruenbacher } 11374b899da5SAndreas Gruenbacher 1138c036061bSYueHaibing static const struct xattr_handler ecryptfs_xattr_handler = { 11394b899da5SAndreas Gruenbacher .prefix = "", /* match anything */ 11404b899da5SAndreas Gruenbacher .get = ecryptfs_xattr_get, 11414b899da5SAndreas Gruenbacher .set = ecryptfs_xattr_set, 11424b899da5SAndreas Gruenbacher }; 11434b899da5SAndreas Gruenbacher 11444b899da5SAndreas Gruenbacher const struct xattr_handler *ecryptfs_xattr_handlers[] = { 11454b899da5SAndreas Gruenbacher &ecryptfs_xattr_handler, 11464b899da5SAndreas Gruenbacher NULL 1147237fead6SMichael Halcrow }; 1148