1237fead6SMichael Halcrow /** 2237fead6SMichael Halcrow * eCryptfs: Linux filesystem encryption layer 3237fead6SMichael Halcrow * 4237fead6SMichael Halcrow * Copyright (C) 1997-2004 Erez Zadok 5237fead6SMichael Halcrow * Copyright (C) 2001-2004 Stony Brook University 6dd2a3b7aSMichael Halcrow * Copyright (C) 2004-2007 International Business Machines Corp. 7237fead6SMichael Halcrow * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> 8237fead6SMichael Halcrow * Michael C. Thompsion <mcthomps@us.ibm.com> 9237fead6SMichael Halcrow * 10237fead6SMichael Halcrow * This program is free software; you can redistribute it and/or 11237fead6SMichael Halcrow * modify it under the terms of the GNU General Public License as 12237fead6SMichael Halcrow * published by the Free Software Foundation; either version 2 of the 13237fead6SMichael Halcrow * License, or (at your option) any later version. 14237fead6SMichael Halcrow * 15237fead6SMichael Halcrow * This program is distributed in the hope that it will be useful, but 16237fead6SMichael Halcrow * WITHOUT ANY WARRANTY; without even the implied warranty of 17237fead6SMichael Halcrow * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18237fead6SMichael Halcrow * General Public License for more details. 19237fead6SMichael Halcrow * 20237fead6SMichael Halcrow * You should have received a copy of the GNU General Public License 21237fead6SMichael Halcrow * along with this program; if not, write to the Free Software 22237fead6SMichael Halcrow * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 23237fead6SMichael Halcrow * 02111-1307, USA. 24237fead6SMichael Halcrow */ 25237fead6SMichael Halcrow 26237fead6SMichael Halcrow #include <linux/file.h> 27237fead6SMichael Halcrow #include <linux/vmalloc.h> 28237fead6SMichael Halcrow #include <linux/pagemap.h> 29237fead6SMichael Halcrow #include <linux/dcache.h> 30237fead6SMichael Halcrow #include <linux/namei.h> 31237fead6SMichael Halcrow #include <linux/mount.h> 32237fead6SMichael Halcrow #include <linux/crypto.h> 330cc72dc7SJosef "Jeff" Sipek #include <linux/fs_stack.h> 345a0e3ad6STejun Heo #include <linux/slab.h> 3548b512e6SRoberto Sassu #include <linux/xattr.h> 360a688ad7SHarvey Harrison #include <asm/unaligned.h> 37237fead6SMichael Halcrow #include "ecryptfs_kernel.h" 38237fead6SMichael Halcrow 39237fead6SMichael Halcrow static struct dentry *lock_parent(struct dentry *dentry) 40237fead6SMichael Halcrow { 41237fead6SMichael Halcrow struct dentry *dir; 42237fead6SMichael Halcrow 438dc4e373SMiklos Szeredi dir = dget_parent(dentry); 44908e0a8aSPeter Zijlstra mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); 45237fead6SMichael Halcrow return dir; 46237fead6SMichael Halcrow } 47237fead6SMichael Halcrow 48237fead6SMichael Halcrow static void unlock_dir(struct dentry *dir) 49237fead6SMichael Halcrow { 50237fead6SMichael Halcrow mutex_unlock(&dir->d_inode->i_mutex); 51237fead6SMichael Halcrow dput(dir); 52237fead6SMichael Halcrow } 53237fead6SMichael Halcrow 54237fead6SMichael Halcrow /** 55237fead6SMichael Halcrow * ecryptfs_create_underlying_file 56237fead6SMichael Halcrow * @lower_dir_inode: inode of the parent in the lower fs of the new file 57f70f582fSQinghuang Feng * @dentry: New file's dentry 58237fead6SMichael Halcrow * @mode: The mode of the new file 59237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 60237fead6SMichael Halcrow * 61237fead6SMichael Halcrow * Creates the file in the lower file system. 62237fead6SMichael Halcrow * 63237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 64237fead6SMichael Halcrow */ 65237fead6SMichael Halcrow static int 66237fead6SMichael Halcrow ecryptfs_create_underlying_file(struct inode *lower_dir_inode, 67237fead6SMichael Halcrow struct dentry *dentry, int mode, 68237fead6SMichael Halcrow struct nameidata *nd) 69237fead6SMichael Halcrow { 70237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 71237fead6SMichael Halcrow struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); 72237fead6SMichael Halcrow struct dentry *dentry_save; 73237fead6SMichael Halcrow struct vfsmount *vfsmount_save; 742e21b3f1STyler Hicks unsigned int flags_save; 75237fead6SMichael Halcrow int rc; 76237fead6SMichael Halcrow 7770b89021STyler Hicks if (nd) { 784ac91378SJan Blunck dentry_save = nd->path.dentry; 794ac91378SJan Blunck vfsmount_save = nd->path.mnt; 802e21b3f1STyler Hicks flags_save = nd->flags; 814ac91378SJan Blunck nd->path.dentry = lower_dentry; 824ac91378SJan Blunck nd->path.mnt = lower_mnt; 832e21b3f1STyler Hicks nd->flags &= ~LOOKUP_OPEN; 8470b89021STyler Hicks } 85237fead6SMichael Halcrow rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); 8670b89021STyler Hicks if (nd) { 874ac91378SJan Blunck nd->path.dentry = dentry_save; 884ac91378SJan Blunck nd->path.mnt = vfsmount_save; 892e21b3f1STyler Hicks nd->flags = flags_save; 9070b89021STyler Hicks } 91237fead6SMichael Halcrow return rc; 92237fead6SMichael Halcrow } 93237fead6SMichael Halcrow 94237fead6SMichael Halcrow /** 95237fead6SMichael Halcrow * ecryptfs_do_create 96237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 97237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 98237fead6SMichael Halcrow * @mode: The mode of the new file 99237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 100237fead6SMichael Halcrow * 101237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 102237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 103237fead6SMichael Halcrow * stat of the lower directory inode. 104237fead6SMichael Halcrow * 105237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 106237fead6SMichael Halcrow */ 107237fead6SMichael Halcrow static int 108237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 109237fead6SMichael Halcrow struct dentry *ecryptfs_dentry, int mode, 110237fead6SMichael Halcrow struct nameidata *nd) 111237fead6SMichael Halcrow { 112237fead6SMichael Halcrow int rc; 113237fead6SMichael Halcrow struct dentry *lower_dentry; 114237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 115237fead6SMichael Halcrow 116237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 117237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 118801678c5SHirofumi Nakagawa if (IS_ERR(lower_dir_dentry)) { 119237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error locking directory of " 120237fead6SMichael Halcrow "dentry\n"); 121237fead6SMichael Halcrow rc = PTR_ERR(lower_dir_dentry); 122237fead6SMichael Halcrow goto out; 123237fead6SMichael Halcrow } 124237fead6SMichael Halcrow rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, 125237fead6SMichael Halcrow ecryptfs_dentry, mode, nd); 1264981e081SMichael Halcrow if (rc) { 127caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 12818d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 129237fead6SMichael Halcrow goto out_lock; 130237fead6SMichael Halcrow } 131237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 132237fead6SMichael Halcrow directory_inode->i_sb, 0); 133237fead6SMichael Halcrow if (rc) { 134237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); 135237fead6SMichael Halcrow goto out_lock; 136237fead6SMichael Halcrow } 1370cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); 1380cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); 139237fead6SMichael Halcrow out_lock: 140237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 141237fead6SMichael Halcrow out: 142237fead6SMichael Halcrow return rc; 143237fead6SMichael Halcrow } 144237fead6SMichael Halcrow 145237fead6SMichael Halcrow /** 146237fead6SMichael Halcrow * ecryptfs_initialize_file 147237fead6SMichael Halcrow * 148237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 149237fead6SMichael Halcrow * file with a header and first data page. 150237fead6SMichael Halcrow * 151237fead6SMichael Halcrow * Returns zero on success 152237fead6SMichael Halcrow */ 153237fead6SMichael Halcrow static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) 154237fead6SMichael Halcrow { 155d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 156d7cdc5feSMichael Halcrow &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; 157237fead6SMichael Halcrow int rc = 0; 158237fead6SMichael Halcrow 159237fead6SMichael Halcrow if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { 160237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 161e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 162d7cdc5feSMichael Halcrow goto out; 163237fead6SMichael Halcrow } 164237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 165237fead6SMichael Halcrow rc = ecryptfs_new_file_context(ecryptfs_dentry); 166237fead6SMichael Halcrow if (rc) { 167d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 168d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 169d7cdc5feSMichael Halcrow goto out; 170237fead6SMichael Halcrow } 171332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry); 172391b52f9SMichael Halcrow if (rc) { 173391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 174332ab16fSTyler Hicks "the lower file for the dentry with name " 175391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 176391b52f9SMichael Halcrow ecryptfs_dentry->d_name.name, rc); 177391b52f9SMichael Halcrow goto out; 178391b52f9SMichael Halcrow } 179d7cdc5feSMichael Halcrow rc = ecryptfs_write_metadata(ecryptfs_dentry); 180332ab16fSTyler Hicks if (rc) 181d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 182332ab16fSTyler Hicks ecryptfs_put_lower_file(ecryptfs_dentry->d_inode); 183237fead6SMichael Halcrow out: 184237fead6SMichael Halcrow return rc; 185237fead6SMichael Halcrow } 186237fead6SMichael Halcrow 187237fead6SMichael Halcrow /** 188237fead6SMichael Halcrow * ecryptfs_create 189237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 190237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 191237fead6SMichael Halcrow * @mode: The mode of the new file. 192237fead6SMichael Halcrow * @nd: nameidata 193237fead6SMichael Halcrow * 194237fead6SMichael Halcrow * Creates a new file. 195237fead6SMichael Halcrow * 196237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 197237fead6SMichael Halcrow */ 198237fead6SMichael Halcrow static int 199237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 200237fead6SMichael Halcrow int mode, struct nameidata *nd) 201237fead6SMichael Halcrow { 202237fead6SMichael Halcrow int rc; 203237fead6SMichael Halcrow 204addd65adSMichael Halcrow /* ecryptfs_do_create() calls ecryptfs_interpose() */ 205237fead6SMichael Halcrow rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); 206237fead6SMichael Halcrow if (unlikely(rc)) { 207237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 208237fead6SMichael Halcrow "lower filesystem\n"); 209237fead6SMichael Halcrow goto out; 210237fead6SMichael Halcrow } 211237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 212237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 213237fead6SMichael Halcrow rc = ecryptfs_initialize_file(ecryptfs_dentry); 214237fead6SMichael Halcrow out: 215237fead6SMichael Halcrow return rc; 216237fead6SMichael Halcrow } 217237fead6SMichael Halcrow 218237fead6SMichael Halcrow /** 219addd65adSMichael Halcrow * ecryptfs_lookup_and_interpose_lower - Perform a lookup 220237fead6SMichael Halcrow */ 221addd65adSMichael Halcrow int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, 222addd65adSMichael Halcrow struct dentry *lower_dentry, 22370b89021STyler Hicks struct inode *ecryptfs_dir_inode) 224237fead6SMichael Halcrow { 225237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 226237fead6SMichael Halcrow struct vfsmount *lower_mnt; 227addd65adSMichael Halcrow struct inode *lower_inode; 2282aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 229237fead6SMichael Halcrow char *page_virt = NULL; 230332ab16fSTyler Hicks int put_lower = 0, rc = 0; 231237fead6SMichael Halcrow 232addd65adSMichael Halcrow lower_dir_dentry = lower_dentry->d_parent; 233addd65adSMichael Halcrow lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( 234addd65adSMichael Halcrow ecryptfs_dentry->d_parent)); 235237fead6SMichael Halcrow lower_inode = lower_dentry->d_inode; 236addd65adSMichael Halcrow fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); 237b7ab39f6SNick Piggin BUG_ON(!lower_dentry->d_count); 238addd65adSMichael Halcrow ecryptfs_set_dentry_private(ecryptfs_dentry, 239237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_dentry_info_cache, 240e94b1766SChristoph Lameter GFP_KERNEL)); 241addd65adSMichael Halcrow if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { 242237fead6SMichael Halcrow rc = -ENOMEM; 243addd65adSMichael Halcrow printk(KERN_ERR "%s: Out of memory whilst attempting " 244addd65adSMichael Halcrow "to allocate ecryptfs_dentry_info struct\n", 245addd65adSMichael Halcrow __func__); 24631f73beeSLino Sanfilippo goto out_put; 247237fead6SMichael Halcrow } 248addd65adSMichael Halcrow ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); 249addd65adSMichael Halcrow ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); 250237fead6SMichael Halcrow if (!lower_dentry->d_inode) { 251237fead6SMichael Halcrow /* We want to add because we couldn't find in lower */ 252addd65adSMichael Halcrow d_add(ecryptfs_dentry, NULL); 253237fead6SMichael Halcrow goto out; 254237fead6SMichael Halcrow } 255addd65adSMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 2563469b573SErez Zadok ecryptfs_dir_inode->i_sb, 2573469b573SErez Zadok ECRYPTFS_INTERPOSE_FLAG_D_ADD); 258237fead6SMichael Halcrow if (rc) { 259addd65adSMichael Halcrow printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", 260addd65adSMichael Halcrow __func__, rc); 261391b52f9SMichael Halcrow goto out; 262237fead6SMichael Halcrow } 263addd65adSMichael Halcrow if (S_ISDIR(lower_inode->i_mode)) 264237fead6SMichael Halcrow goto out; 265addd65adSMichael Halcrow if (S_ISLNK(lower_inode->i_mode)) 266237fead6SMichael Halcrow goto out; 267addd65adSMichael Halcrow if (special_file(lower_inode->i_mode)) 268202a21d6SRyusuke Konishi goto out; 269237fead6SMichael Halcrow /* Released in this function */ 270addd65adSMichael Halcrow page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); 271237fead6SMichael Halcrow if (!page_virt) { 272addd65adSMichael Halcrow printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", 273addd65adSMichael Halcrow __func__); 274237fead6SMichael Halcrow rc = -ENOMEM; 275391b52f9SMichael Halcrow goto out; 276237fead6SMichael Halcrow } 277332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry); 278391b52f9SMichael Halcrow if (rc) { 279391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 280332ab16fSTyler Hicks "the lower file for the dentry with name " 281391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 282addd65adSMichael Halcrow ecryptfs_dentry->d_name.name, rc); 283addd65adSMichael Halcrow goto out_free_kmem; 284391b52f9SMichael Halcrow } 285332ab16fSTyler Hicks put_lower = 1; 2862aac0cf8STyler Hicks crypt_stat = &ecryptfs_inode_to_private( 2872aac0cf8STyler Hicks ecryptfs_dentry->d_inode)->crypt_stat; 2882aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 2892aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 2902aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 291d7cdc5feSMichael Halcrow rc = ecryptfs_read_and_validate_header_region(page_virt, 292addd65adSMichael Halcrow ecryptfs_dentry->d_inode); 293237fead6SMichael Halcrow if (rc) { 2941984c23fSTyler Hicks memset(page_virt, 0, PAGE_CACHE_SIZE); 295addd65adSMichael Halcrow rc = ecryptfs_read_and_validate_xattr_region(page_virt, 296addd65adSMichael Halcrow ecryptfs_dentry); 297dd2a3b7aSMichael Halcrow if (rc) { 298237fead6SMichael Halcrow rc = 0; 299addd65adSMichael Halcrow goto out_free_kmem; 300237fead6SMichael Halcrow } 301dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 302dd2a3b7aSMichael Halcrow } 3033aeb86eaSTyler Hicks ecryptfs_i_size_init(page_virt, ecryptfs_dentry->d_inode); 304addd65adSMichael Halcrow out_free_kmem: 305237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 306237fead6SMichael Halcrow goto out; 30731f73beeSLino Sanfilippo out_put: 308237fead6SMichael Halcrow dput(lower_dentry); 30931f73beeSLino Sanfilippo mntput(lower_mnt); 310addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 311237fead6SMichael Halcrow out: 312332ab16fSTyler Hicks if (put_lower) 313332ab16fSTyler Hicks ecryptfs_put_lower_file(ecryptfs_dentry->d_inode); 314addd65adSMichael Halcrow return rc; 315addd65adSMichael Halcrow } 316addd65adSMichael Halcrow 317addd65adSMichael Halcrow /** 318addd65adSMichael Halcrow * ecryptfs_lookup 319addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 320addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 321addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 322addd65adSMichael Halcrow * 323addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 324addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 325addd65adSMichael Halcrow */ 326addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 327addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 328addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 329addd65adSMichael Halcrow { 330addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 331a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 332addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 333addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 334addd65adSMichael Halcrow int rc = 0; 335addd65adSMichael Halcrow 336addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 337addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 338addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 339addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 340addd65adSMichael Halcrow goto out_d_drop; 341addd65adSMichael Halcrow } 342addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 3438787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 3448787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 3458787c7a3STyler Hicks lower_dir_dentry, 3468787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 3478787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 348addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 349addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 3508787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 3519f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 3529f37622fSTyler Hicks encrypted_and_encoded_name); 353addd65adSMichael Halcrow goto out_d_drop; 354addd65adSMichael Halcrow } 355addd65adSMichael Halcrow if (lower_dentry->d_inode) 356addd65adSMichael Halcrow goto lookup_and_interpose; 357addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 358addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 3592aac0cf8STyler Hicks if (!(mount_crypt_stat 3602aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 361addd65adSMichael Halcrow goto lookup_and_interpose; 362addd65adSMichael Halcrow dput(lower_dentry); 363addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 364addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 3652aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 366addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 367addd65adSMichael Halcrow if (rc) { 368addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 369addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 370addd65adSMichael Halcrow goto out_d_drop; 371addd65adSMichael Halcrow } 3728787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 3738787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 3748787c7a3STyler Hicks lower_dir_dentry, 3758787c7a3STyler Hicks encrypted_and_encoded_name_size); 3768787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 377addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 378addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 3798787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 3809f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 381addd65adSMichael Halcrow encrypted_and_encoded_name); 382addd65adSMichael Halcrow goto out_d_drop; 383addd65adSMichael Halcrow } 384addd65adSMichael Halcrow lookup_and_interpose: 385addd65adSMichael Halcrow rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, 38670b89021STyler Hicks ecryptfs_dir_inode); 387addd65adSMichael Halcrow goto out; 388addd65adSMichael Halcrow out_d_drop: 389addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 390addd65adSMichael Halcrow out: 391addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 392237fead6SMichael Halcrow return ERR_PTR(rc); 393237fead6SMichael Halcrow } 394237fead6SMichael Halcrow 395237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 396237fead6SMichael Halcrow struct dentry *new_dentry) 397237fead6SMichael Halcrow { 398237fead6SMichael Halcrow struct dentry *lower_old_dentry; 399237fead6SMichael Halcrow struct dentry *lower_new_dentry; 400237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 401237fead6SMichael Halcrow u64 file_size_save; 402237fead6SMichael Halcrow int rc; 403237fead6SMichael Halcrow 404237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 405237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 406237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 407237fead6SMichael Halcrow dget(lower_old_dentry); 408237fead6SMichael Halcrow dget(lower_new_dentry); 409237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 410237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 411237fead6SMichael Halcrow lower_new_dentry); 412237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 413237fead6SMichael Halcrow goto out_lock; 414237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); 415237fead6SMichael Halcrow if (rc) 416237fead6SMichael Halcrow goto out_lock; 4173a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4183a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 419237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 420237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 421237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 422237fead6SMichael Halcrow out_lock: 423237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 424237fead6SMichael Halcrow dput(lower_new_dentry); 425237fead6SMichael Halcrow dput(lower_old_dentry); 426237fead6SMichael Halcrow return rc; 427237fead6SMichael Halcrow } 428237fead6SMichael Halcrow 429237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 430237fead6SMichael Halcrow { 431237fead6SMichael Halcrow int rc = 0; 432237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 433237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 4348dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 435237fead6SMichael Halcrow 4369c2d2056STyler Hicks dget(lower_dentry); 4378dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 438237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 439237fead6SMichael Halcrow if (rc) { 440ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 441237fead6SMichael Halcrow goto out_unlock; 442237fead6SMichael Halcrow } 4430cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 444237fead6SMichael Halcrow dentry->d_inode->i_nlink = 445237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 446237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 447caeeeecfSMichael Halcrow d_drop(dentry); 448237fead6SMichael Halcrow out_unlock: 4498dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 4509c2d2056STyler Hicks dput(lower_dentry); 451237fead6SMichael Halcrow return rc; 452237fead6SMichael Halcrow } 453237fead6SMichael Halcrow 454237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 455237fead6SMichael Halcrow const char *symname) 456237fead6SMichael Halcrow { 457237fead6SMichael Halcrow int rc; 458237fead6SMichael Halcrow struct dentry *lower_dentry; 459237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 460237fead6SMichael Halcrow char *encoded_symname; 461addd65adSMichael Halcrow size_t encoded_symlen; 462addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 463237fead6SMichael Halcrow 464237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 465237fead6SMichael Halcrow dget(lower_dentry); 466237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 467addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 468addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 469addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 470addd65adSMichael Halcrow &encoded_symlen, 471addd65adSMichael Halcrow NULL, 472addd65adSMichael Halcrow mount_crypt_stat, symname, 473addd65adSMichael Halcrow strlen(symname)); 474addd65adSMichael Halcrow if (rc) 475237fead6SMichael Halcrow goto out_lock; 476237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 477db2e747bSMiklos Szeredi encoded_symname); 478237fead6SMichael Halcrow kfree(encoded_symname); 479237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 480237fead6SMichael Halcrow goto out_lock; 481237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 482237fead6SMichael Halcrow if (rc) 483237fead6SMichael Halcrow goto out_lock; 4840cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4850cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 486237fead6SMichael Halcrow out_lock: 487237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 488237fead6SMichael Halcrow dput(lower_dentry); 489237fead6SMichael Halcrow if (!dentry->d_inode) 490237fead6SMichael Halcrow d_drop(dentry); 491237fead6SMichael Halcrow return rc; 492237fead6SMichael Halcrow } 493237fead6SMichael Halcrow 494237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 495237fead6SMichael Halcrow { 496237fead6SMichael Halcrow int rc; 497237fead6SMichael Halcrow struct dentry *lower_dentry; 498237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 499237fead6SMichael Halcrow 500237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 501237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 502237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 503237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 504237fead6SMichael Halcrow goto out; 505237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 506237fead6SMichael Halcrow if (rc) 507237fead6SMichael Halcrow goto out; 5080cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5090cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 510237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 511237fead6SMichael Halcrow out: 512237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 513237fead6SMichael Halcrow if (!dentry->d_inode) 514237fead6SMichael Halcrow d_drop(dentry); 515237fead6SMichael Halcrow return rc; 516237fead6SMichael Halcrow } 517237fead6SMichael Halcrow 518237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 519237fead6SMichael Halcrow { 520237fead6SMichael Halcrow struct dentry *lower_dentry; 521237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 52245ec4abaSMichael Halcrow int rc; 523237fead6SMichael Halcrow 524237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 52545ec4abaSMichael Halcrow dget(dentry); 526237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 52745ec4abaSMichael Halcrow dget(lower_dentry); 528237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 52945ec4abaSMichael Halcrow dput(lower_dentry); 5300cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 531237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 532237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 533237fead6SMichael Halcrow if (!rc) 534237fead6SMichael Halcrow d_drop(dentry); 53545ec4abaSMichael Halcrow dput(dentry); 536237fead6SMichael Halcrow return rc; 537237fead6SMichael Halcrow } 538237fead6SMichael Halcrow 539237fead6SMichael Halcrow static int 540237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 541237fead6SMichael Halcrow { 542237fead6SMichael Halcrow int rc; 543237fead6SMichael Halcrow struct dentry *lower_dentry; 544237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 545237fead6SMichael Halcrow 546237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 547237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 548237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 549237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 550237fead6SMichael Halcrow goto out; 551391b52f9SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 552237fead6SMichael Halcrow if (rc) 553237fead6SMichael Halcrow goto out; 5540cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5550cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 556237fead6SMichael Halcrow out: 557237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 558237fead6SMichael Halcrow if (!dentry->d_inode) 559237fead6SMichael Halcrow d_drop(dentry); 560237fead6SMichael Halcrow return rc; 561237fead6SMichael Halcrow } 562237fead6SMichael Halcrow 563237fead6SMichael Halcrow static int 564237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 565237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 566237fead6SMichael Halcrow { 567237fead6SMichael Halcrow int rc; 568237fead6SMichael Halcrow struct dentry *lower_old_dentry; 569237fead6SMichael Halcrow struct dentry *lower_new_dentry; 570237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 571237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 5720d132f73SErez Zadok struct dentry *trap = NULL; 573237fead6SMichael Halcrow 574237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 575237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 576237fead6SMichael Halcrow dget(lower_old_dentry); 577237fead6SMichael Halcrow dget(lower_new_dentry); 578237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 579237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 5800d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 5810d132f73SErez Zadok /* source should not be ancestor of target */ 5820d132f73SErez Zadok if (trap == lower_old_dentry) { 5830d132f73SErez Zadok rc = -EINVAL; 5840d132f73SErez Zadok goto out_lock; 5850d132f73SErez Zadok } 5860d132f73SErez Zadok /* target should not be ancestor of source */ 5870d132f73SErez Zadok if (trap == lower_new_dentry) { 5880d132f73SErez Zadok rc = -ENOTEMPTY; 5890d132f73SErez Zadok goto out_lock; 5900d132f73SErez Zadok } 591237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 592237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 593237fead6SMichael Halcrow if (rc) 594237fead6SMichael Halcrow goto out_lock; 5959afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 596237fead6SMichael Halcrow if (new_dir != old_dir) 5979afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 598237fead6SMichael Halcrow out_lock: 599237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 600dd55c898STyler Hicks dput(lower_new_dir_dentry); 601dd55c898STyler Hicks dput(lower_old_dir_dentry); 602237fead6SMichael Halcrow dput(lower_new_dentry); 603237fead6SMichael Halcrow dput(lower_old_dentry); 604237fead6SMichael Halcrow return rc; 605237fead6SMichael Halcrow } 606237fead6SMichael Halcrow 6073a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 6083a60a168STyler Hicks size_t *bufsiz) 609237fead6SMichael Halcrow { 6103a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 611237fead6SMichael Halcrow char *lower_buf; 6123a60a168STyler Hicks size_t lower_bufsiz = PATH_MAX; 613addd65adSMichael Halcrow mm_segment_t old_fs; 614addd65adSMichael Halcrow int rc; 615237fead6SMichael Halcrow 6163a6b42caSTyler Hicks lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); 6173a60a168STyler Hicks if (!lower_buf) { 618237fead6SMichael Halcrow rc = -ENOMEM; 619237fead6SMichael Halcrow goto out; 620237fead6SMichael Halcrow } 621237fead6SMichael Halcrow old_fs = get_fs(); 622237fead6SMichael Halcrow set_fs(get_ds()); 623237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 624237fead6SMichael Halcrow (char __user *)lower_buf, 6253a6b42caSTyler Hicks lower_bufsiz); 626237fead6SMichael Halcrow set_fs(old_fs); 6273a60a168STyler Hicks if (rc < 0) 6283a60a168STyler Hicks goto out; 6293a60a168STyler Hicks lower_bufsiz = rc; 6303a60a168STyler Hicks rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, 6313a60a168STyler Hicks lower_buf, lower_bufsiz); 6323a60a168STyler Hicks out: 633237fead6SMichael Halcrow kfree(lower_buf); 6343a60a168STyler Hicks return rc; 6353a60a168STyler Hicks } 6363a60a168STyler Hicks 6373a60a168STyler Hicks static int 6383a60a168STyler Hicks ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 6393a60a168STyler Hicks { 6403a60a168STyler Hicks char *kbuf; 6413a60a168STyler Hicks size_t kbufsiz, copied; 6423a60a168STyler Hicks int rc; 6433a60a168STyler Hicks 6443a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); 6453a60a168STyler Hicks if (rc) 6463a60a168STyler Hicks goto out; 6473a60a168STyler Hicks copied = min_t(size_t, bufsiz, kbufsiz); 6483a60a168STyler Hicks rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; 6493a60a168STyler Hicks kfree(kbuf); 6503a60a168STyler Hicks fsstack_copy_attr_atime(dentry->d_inode, 6513a60a168STyler Hicks ecryptfs_dentry_to_lower(dentry)->d_inode); 652237fead6SMichael Halcrow out: 653237fead6SMichael Halcrow return rc; 654237fead6SMichael Halcrow } 655237fead6SMichael Halcrow 656237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 657237fead6SMichael Halcrow { 658237fead6SMichael Halcrow char *buf; 659237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 660237fead6SMichael Halcrow mm_segment_t old_fs; 661237fead6SMichael Halcrow 662237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 663237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 664237fead6SMichael Halcrow if (!buf) { 665806892e9SOGAWA Hirofumi buf = ERR_PTR(-ENOMEM); 666237fead6SMichael Halcrow goto out; 667237fead6SMichael Halcrow } 668237fead6SMichael Halcrow old_fs = get_fs(); 669237fead6SMichael Halcrow set_fs(get_ds()); 670237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 671237fead6SMichael Halcrow set_fs(old_fs); 672806892e9SOGAWA Hirofumi if (rc < 0) { 673237fead6SMichael Halcrow kfree(buf); 674806892e9SOGAWA Hirofumi buf = ERR_PTR(rc); 675806892e9SOGAWA Hirofumi } else 676806892e9SOGAWA Hirofumi buf[rc] = '\0'; 677237fead6SMichael Halcrow out: 678806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 679806892e9SOGAWA Hirofumi return NULL; 680237fead6SMichael Halcrow } 681237fead6SMichael Halcrow 682237fead6SMichael Halcrow static void 683237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 684237fead6SMichael Halcrow { 685806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 686806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 687237fead6SMichael Halcrow /* Free the char* */ 688806892e9SOGAWA Hirofumi kfree(buf); 689806892e9SOGAWA Hirofumi } 690237fead6SMichael Halcrow } 691237fead6SMichael Halcrow 692237fead6SMichael Halcrow /** 693237fead6SMichael Halcrow * upper_size_to_lower_size 694237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 695237fead6SMichael Halcrow * @upper_size: Size of the upper file 696237fead6SMichael Halcrow * 697cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 698237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 699237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 700237fead6SMichael Halcrow * 701237fead6SMichael Halcrow * Returns Calculated size of the lower file. 702237fead6SMichael Halcrow */ 703237fead6SMichael Halcrow static loff_t 704237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 705237fead6SMichael Halcrow loff_t upper_size) 706237fead6SMichael Halcrow { 707237fead6SMichael Halcrow loff_t lower_size; 708237fead6SMichael Halcrow 709157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 710237fead6SMichael Halcrow if (upper_size != 0) { 711237fead6SMichael Halcrow loff_t num_extents; 712237fead6SMichael Halcrow 713237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 714237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 715237fead6SMichael Halcrow num_extents++; 716237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 717237fead6SMichael Halcrow } 718237fead6SMichael Halcrow return lower_size; 719237fead6SMichael Halcrow } 720237fead6SMichael Halcrow 721237fead6SMichael Halcrow /** 7225f3ef64fSTyler Hicks * truncate_upper 723237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7245f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7255f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 726237fead6SMichael Halcrow * 727237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 728237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7295f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7305f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7315f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7325f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7335f3ef64fSTyler Hicks * the truncation of the lower inode. 734237fead6SMichael Halcrow * 735237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 736237fead6SMichael Halcrow */ 7375f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7385f3ef64fSTyler Hicks struct iattr *lower_ia) 739237fead6SMichael Halcrow { 740237fead6SMichael Halcrow int rc = 0; 741237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 742237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 743237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 744237fead6SMichael Halcrow loff_t lower_size_before_truncate; 745237fead6SMichael Halcrow loff_t lower_size_after_truncate; 746237fead6SMichael Halcrow 7475f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7485f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 749332ab16fSTyler Hicks return 0; 7505f3ef64fSTyler Hicks } 751332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(dentry); 752332ab16fSTyler Hicks if (rc) 753332ab16fSTyler Hicks return rc; 754237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 755237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7565f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7572ed92554SMichael Halcrow char zero[] = { 0x00 }; 758240e2df5SMichael Halcrow 7595f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7602ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7612ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7622ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7632ed92554SMichael Halcrow * file and the new and of the file */ 76448c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7655f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7665f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7675f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7685f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 7695f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 7702ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 7712ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 7725f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 7732ed92554SMichael Halcrow 7742c27c65eSChristoph Hellwig 7752c27c65eSChristoph Hellwig /* 7762c27c65eSChristoph Hellwig * XXX(truncate) this should really happen at the begginning 7772c27c65eSChristoph Hellwig * of ->setattr. But the code is too messy to that as part 7782c27c65eSChristoph Hellwig * of a larger patch. ecryptfs is also totally missing out 7792c27c65eSChristoph Hellwig * on the inode_change_ok check at the beginning of 7802c27c65eSChristoph Hellwig * ->setattr while would include this. 7812c27c65eSChristoph Hellwig */ 7822c27c65eSChristoph Hellwig rc = inode_newsize_ok(inode, ia->ia_size); 78313a791b4STyler Hicks if (rc) 78448c1e44aSAl Viro goto out; 7852c27c65eSChristoph Hellwig 7862c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7872c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7885f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7895f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 79048c1e44aSAl Viro goto out; 79113a791b4STyler Hicks } 7922ed92554SMichael Halcrow if (num_zeros) { 7932ed92554SMichael Halcrow char *zeros_virt; 7942ed92554SMichael Halcrow 7952ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7962ed92554SMichael Halcrow if (!zeros_virt) { 7972ed92554SMichael Halcrow rc = -ENOMEM; 79848c1e44aSAl Viro goto out; 799240e2df5SMichael Halcrow } 80048c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8015f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8022ed92554SMichael Halcrow kfree(zeros_virt); 8035dda6992SMichael Halcrow if (rc) { 804240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 805240e2df5SMichael Halcrow "the remainder of the end page on " 806240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 80748c1e44aSAl Viro goto out; 808240e2df5SMichael Halcrow } 809240e2df5SMichael Halcrow } 8102c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8110216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 812dd2a3b7aSMichael Halcrow if (rc) { 813dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 814dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 815dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 81648c1e44aSAl Viro goto out; 817dd2a3b7aSMichael Halcrow } 818237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 819237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 820237fead6SMichael Halcrow lower_size_before_truncate = 821237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 822237fead6SMichael Halcrow lower_size_after_truncate = 8235f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8245f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8255f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8265f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8275f3ef64fSTyler Hicks } else 8285f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 829237fead6SMichael Halcrow } 830237fead6SMichael Halcrow out: 831332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 832237fead6SMichael Halcrow return rc; 833237fead6SMichael Halcrow } 834237fead6SMichael Halcrow 8355f3ef64fSTyler Hicks /** 8365f3ef64fSTyler Hicks * ecryptfs_truncate 8375f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8385f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8395f3ef64fSTyler Hicks * 8405f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8415f3ef64fSTyler Hicks * its corresponding lower inode. 8425f3ef64fSTyler Hicks * 8435f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8445f3ef64fSTyler Hicks */ 8455f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8465f3ef64fSTyler Hicks { 8475f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8485f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8495f3ef64fSTyler Hicks int rc; 8505f3ef64fSTyler Hicks 8515f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8525f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8535f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8545f3ef64fSTyler Hicks 8555f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 8565f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 8575f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 8585f3ef64fSTyler Hicks } 8595f3ef64fSTyler Hicks return rc; 8605f3ef64fSTyler Hicks } 8615f3ef64fSTyler Hicks 862237fead6SMichael Halcrow static int 863b74c79e9SNick Piggin ecryptfs_permission(struct inode *inode, int mask, unsigned int flags) 864237fead6SMichael Halcrow { 865b74c79e9SNick Piggin if (flags & IPERM_FLAG_RCU) 866b74c79e9SNick Piggin return -ECHILD; 867f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 868237fead6SMichael Halcrow } 869237fead6SMichael Halcrow 870237fead6SMichael Halcrow /** 871237fead6SMichael Halcrow * ecryptfs_setattr 872237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 873237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 874237fead6SMichael Halcrow * 875237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 876237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 877237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 878237fead6SMichael Halcrow * 879237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 880237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 881237fead6SMichael Halcrow */ 882237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 883237fead6SMichael Halcrow { 884237fead6SMichael Halcrow int rc = 0; 885237fead6SMichael Halcrow struct dentry *lower_dentry; 8865f3ef64fSTyler Hicks struct iattr lower_ia; 887237fead6SMichael Halcrow struct inode *inode; 888237fead6SMichael Halcrow struct inode *lower_inode; 889237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 890237fead6SMichael Halcrow 891237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 892e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 893e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 894237fead6SMichael Halcrow inode = dentry->d_inode; 895237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 896e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 897e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 898e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 899e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 90064ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 90164ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 90264ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 903e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 904e10f281bSMichael Halcrow 905e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 906e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 907332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(dentry); 908332ab16fSTyler Hicks if (rc) { 909332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 910332ab16fSTyler Hicks goto out; 911332ab16fSTyler Hicks } 912d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 913332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9145dda6992SMichael Halcrow if (rc) { 915e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 916e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 917e10f281bSMichael Halcrow rc = -EIO; 91825bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 919e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 92025bd8174SMichael Halcrow "or the key could not be retrieved. " 92125bd8174SMichael Halcrow "Plaintext passthrough mode is not " 922e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 923e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 924e10f281bSMichael Halcrow goto out; 925e10f281bSMichael Halcrow } 926e10f281bSMichael Halcrow rc = 0; 9273aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9283aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 929e10f281bSMichael Halcrow } 930e10f281bSMichael Halcrow } 931e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 9325f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9335f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9345f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 935237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9365f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 937237fead6SMichael Halcrow if (rc < 0) 938237fead6SMichael Halcrow goto out; 939237fead6SMichael Halcrow } 9401ac564ecSJeff Layton 9411ac564ecSJeff Layton /* 9421ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9431ac564ecSJeff Layton * to interpret this in its own way. 9441ac564ecSJeff Layton */ 9455f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9465f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9471ac564ecSJeff Layton 9489c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 9495f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9509c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 951237fead6SMichael Halcrow out: 9529afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 953237fead6SMichael Halcrow return rc; 954237fead6SMichael Halcrow } 955237fead6SMichael Halcrow 9563a60a168STyler Hicks int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 9573a60a168STyler Hicks struct kstat *stat) 9583a60a168STyler Hicks { 9593a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9603a60a168STyler Hicks int rc = 0; 9613a60a168STyler Hicks 9623a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9633a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 9643a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 9653a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 9663a60a168STyler Hicks char *target; 9673a60a168STyler Hicks size_t targetsiz; 9683a60a168STyler Hicks 9693a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 9703a60a168STyler Hicks if (!rc) { 9713a60a168STyler Hicks kfree(target); 9723a60a168STyler Hicks stat->size = targetsiz; 9733a60a168STyler Hicks } 9743a60a168STyler Hicks } 9753a60a168STyler Hicks return rc; 9763a60a168STyler Hicks } 9773a60a168STyler Hicks 978f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 979f8f484d1STyler Hicks struct kstat *stat) 980f8f484d1STyler Hicks { 981f8f484d1STyler Hicks struct kstat lower_stat; 982f8f484d1STyler Hicks int rc; 983f8f484d1STyler Hicks 984f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 985f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 986f8f484d1STyler Hicks if (!rc) { 98755f9cf6bSTyler Hicks fsstack_copy_attr_all(dentry->d_inode, 98855f9cf6bSTyler Hicks ecryptfs_inode_to_lower(dentry->d_inode)); 989f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 990f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 991f8f484d1STyler Hicks } 992f8f484d1STyler Hicks return rc; 993f8f484d1STyler Hicks } 994f8f484d1STyler Hicks 995dd2a3b7aSMichael Halcrow int 996237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 997237fead6SMichael Halcrow size_t size, int flags) 998237fead6SMichael Halcrow { 999237fead6SMichael Halcrow int rc = 0; 1000237fead6SMichael Halcrow struct dentry *lower_dentry; 1001237fead6SMichael Halcrow 1002237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1003237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1004cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1005237fead6SMichael Halcrow goto out; 1006237fead6SMichael Halcrow } 100748b512e6SRoberto Sassu 100848b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 1009237fead6SMichael Halcrow out: 1010237fead6SMichael Halcrow return rc; 1011237fead6SMichael Halcrow } 1012237fead6SMichael Halcrow 1013dd2a3b7aSMichael Halcrow ssize_t 1014d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1015d7cdc5feSMichael Halcrow void *value, size_t size) 1016d7cdc5feSMichael Halcrow { 1017d7cdc5feSMichael Halcrow int rc = 0; 1018d7cdc5feSMichael Halcrow 1019d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1020cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1021d7cdc5feSMichael Halcrow goto out; 1022d7cdc5feSMichael Halcrow } 1023d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1024d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1025d7cdc5feSMichael Halcrow size); 1026d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1027d7cdc5feSMichael Halcrow out: 1028d7cdc5feSMichael Halcrow return rc; 1029d7cdc5feSMichael Halcrow } 1030d7cdc5feSMichael Halcrow 10317896b631SAdrian Bunk static ssize_t 1032237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1033237fead6SMichael Halcrow size_t size) 1034237fead6SMichael Halcrow { 10352ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 10362ed92554SMichael Halcrow value, size); 1037237fead6SMichael Halcrow } 1038237fead6SMichael Halcrow 1039237fead6SMichael Halcrow static ssize_t 1040237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1041237fead6SMichael Halcrow { 1042237fead6SMichael Halcrow int rc = 0; 1043237fead6SMichael Halcrow struct dentry *lower_dentry; 1044237fead6SMichael Halcrow 1045237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1046237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1047cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1048237fead6SMichael Halcrow goto out; 1049237fead6SMichael Halcrow } 1050237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1051237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1052237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1053237fead6SMichael Halcrow out: 1054237fead6SMichael Halcrow return rc; 1055237fead6SMichael Halcrow } 1056237fead6SMichael Halcrow 1057237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1058237fead6SMichael Halcrow { 1059237fead6SMichael Halcrow int rc = 0; 1060237fead6SMichael Halcrow struct dentry *lower_dentry; 1061237fead6SMichael Halcrow 1062237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1063237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1064cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1065237fead6SMichael Halcrow goto out; 1066237fead6SMichael Halcrow } 1067237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1068237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1069237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1070237fead6SMichael Halcrow out: 1071237fead6SMichael Halcrow return rc; 1072237fead6SMichael Halcrow } 1073237fead6SMichael Halcrow 1074237fead6SMichael Halcrow int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) 1075237fead6SMichael Halcrow { 1076237fead6SMichael Halcrow if ((ecryptfs_inode_to_lower(inode) 1077237fead6SMichael Halcrow == (struct inode *)candidate_lower_inode)) 1078237fead6SMichael Halcrow return 1; 1079237fead6SMichael Halcrow else 1080237fead6SMichael Halcrow return 0; 1081237fead6SMichael Halcrow } 1082237fead6SMichael Halcrow 1083237fead6SMichael Halcrow int ecryptfs_inode_set(struct inode *inode, void *lower_inode) 1084237fead6SMichael Halcrow { 1085237fead6SMichael Halcrow ecryptfs_init_inode(inode, (struct inode *)lower_inode); 1086237fead6SMichael Halcrow return 0; 1087237fead6SMichael Halcrow } 1088237fead6SMichael Halcrow 1089754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1090237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1091237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1092237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1093237fead6SMichael Halcrow .permission = ecryptfs_permission, 1094237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 10953a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1096237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1097237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1098237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1099237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1100237fead6SMichael Halcrow }; 1101237fead6SMichael Halcrow 1102754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1103237fead6SMichael Halcrow .create = ecryptfs_create, 1104237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1105237fead6SMichael Halcrow .link = ecryptfs_link, 1106237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1107237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1108237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1109237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1110237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1111237fead6SMichael Halcrow .rename = ecryptfs_rename, 1112237fead6SMichael Halcrow .permission = ecryptfs_permission, 1113237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1114237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1115237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1116237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1117237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1118237fead6SMichael Halcrow }; 1119237fead6SMichael Halcrow 1120754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1121237fead6SMichael Halcrow .permission = ecryptfs_permission, 1122237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1123f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1124237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1125237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1126237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1127237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1128237fead6SMichael Halcrow }; 1129