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; 228e77a56ddSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 2292aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 230237fead6SMichael Halcrow char *page_virt = NULL; 231237fead6SMichael Halcrow u64 file_size; 232332ab16fSTyler Hicks int put_lower = 0, rc = 0; 233237fead6SMichael Halcrow 234addd65adSMichael Halcrow lower_dir_dentry = lower_dentry->d_parent; 235addd65adSMichael Halcrow lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( 236addd65adSMichael Halcrow ecryptfs_dentry->d_parent)); 237237fead6SMichael Halcrow lower_inode = lower_dentry->d_inode; 238addd65adSMichael Halcrow fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); 239b7ab39f6SNick Piggin BUG_ON(!lower_dentry->d_count); 240addd65adSMichael Halcrow ecryptfs_set_dentry_private(ecryptfs_dentry, 241237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_dentry_info_cache, 242e94b1766SChristoph Lameter GFP_KERNEL)); 243addd65adSMichael Halcrow if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { 244237fead6SMichael Halcrow rc = -ENOMEM; 245addd65adSMichael Halcrow printk(KERN_ERR "%s: Out of memory whilst attempting " 246addd65adSMichael Halcrow "to allocate ecryptfs_dentry_info struct\n", 247addd65adSMichael Halcrow __func__); 24831f73beeSLino Sanfilippo goto out_put; 249237fead6SMichael Halcrow } 250addd65adSMichael Halcrow ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); 251addd65adSMichael Halcrow ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); 252237fead6SMichael Halcrow if (!lower_dentry->d_inode) { 253237fead6SMichael Halcrow /* We want to add because we couldn't find in lower */ 254addd65adSMichael Halcrow d_add(ecryptfs_dentry, NULL); 255237fead6SMichael Halcrow goto out; 256237fead6SMichael Halcrow } 257addd65adSMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 2583469b573SErez Zadok ecryptfs_dir_inode->i_sb, 2593469b573SErez Zadok ECRYPTFS_INTERPOSE_FLAG_D_ADD); 260237fead6SMichael Halcrow if (rc) { 261addd65adSMichael Halcrow printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", 262addd65adSMichael Halcrow __func__, rc); 263391b52f9SMichael Halcrow goto out; 264237fead6SMichael Halcrow } 265addd65adSMichael Halcrow if (S_ISDIR(lower_inode->i_mode)) 266237fead6SMichael Halcrow goto out; 267addd65adSMichael Halcrow if (S_ISLNK(lower_inode->i_mode)) 268237fead6SMichael Halcrow goto out; 269addd65adSMichael Halcrow if (special_file(lower_inode->i_mode)) 270202a21d6SRyusuke Konishi goto out; 271237fead6SMichael Halcrow /* Released in this function */ 272addd65adSMichael Halcrow page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); 273237fead6SMichael Halcrow if (!page_virt) { 274addd65adSMichael Halcrow printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", 275addd65adSMichael Halcrow __func__); 276237fead6SMichael Halcrow rc = -ENOMEM; 277391b52f9SMichael Halcrow goto out; 278237fead6SMichael Halcrow } 279332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry); 280391b52f9SMichael Halcrow if (rc) { 281391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 282332ab16fSTyler Hicks "the lower file for the dentry with name " 283391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 284addd65adSMichael Halcrow ecryptfs_dentry->d_name.name, rc); 285addd65adSMichael Halcrow goto out_free_kmem; 286391b52f9SMichael Halcrow } 287332ab16fSTyler Hicks put_lower = 1; 2882aac0cf8STyler Hicks crypt_stat = &ecryptfs_inode_to_private( 2892aac0cf8STyler Hicks ecryptfs_dentry->d_inode)->crypt_stat; 2902aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 2912aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 2922aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 293d7cdc5feSMichael Halcrow rc = ecryptfs_read_and_validate_header_region(page_virt, 294addd65adSMichael Halcrow ecryptfs_dentry->d_inode); 295237fead6SMichael Halcrow if (rc) { 2961984c23fSTyler Hicks memset(page_virt, 0, PAGE_CACHE_SIZE); 297addd65adSMichael Halcrow rc = ecryptfs_read_and_validate_xattr_region(page_virt, 298addd65adSMichael Halcrow ecryptfs_dentry); 299dd2a3b7aSMichael Halcrow if (rc) { 300237fead6SMichael Halcrow rc = 0; 301addd65adSMichael Halcrow goto out_free_kmem; 302237fead6SMichael Halcrow } 303dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 304dd2a3b7aSMichael Halcrow } 305e77a56ddSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 306addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 307e77a56ddSMichael Halcrow if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { 308e77a56ddSMichael Halcrow if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) 309fa3ef1cbSTyler Hicks file_size = (crypt_stat->metadata_size 310e77a56ddSMichael Halcrow + i_size_read(lower_dentry->d_inode)); 311e77a56ddSMichael Halcrow else 312e77a56ddSMichael Halcrow file_size = i_size_read(lower_dentry->d_inode); 313e77a56ddSMichael Halcrow } else { 3140a688ad7SHarvey Harrison file_size = get_unaligned_be64(page_virt); 315e77a56ddSMichael Halcrow } 316addd65adSMichael Halcrow i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size); 317addd65adSMichael Halcrow out_free_kmem: 318237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 319237fead6SMichael Halcrow goto out; 32031f73beeSLino Sanfilippo out_put: 321237fead6SMichael Halcrow dput(lower_dentry); 32231f73beeSLino Sanfilippo mntput(lower_mnt); 323addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 324237fead6SMichael Halcrow out: 325332ab16fSTyler Hicks if (put_lower) 326332ab16fSTyler Hicks ecryptfs_put_lower_file(ecryptfs_dentry->d_inode); 327addd65adSMichael Halcrow return rc; 328addd65adSMichael Halcrow } 329addd65adSMichael Halcrow 330addd65adSMichael Halcrow /** 331addd65adSMichael Halcrow * ecryptfs_lookup 332addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 333addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 334addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 335addd65adSMichael Halcrow * 336addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 337addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 338addd65adSMichael Halcrow */ 339addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 340addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 341addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 342addd65adSMichael Halcrow { 343addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 344a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 345addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 346addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 347addd65adSMichael Halcrow int rc = 0; 348addd65adSMichael Halcrow 349addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 350addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 351addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 352addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 353addd65adSMichael Halcrow goto out_d_drop; 354addd65adSMichael Halcrow } 355addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 3568787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 3578787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 3588787c7a3STyler Hicks lower_dir_dentry, 3598787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 3608787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 361addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 362addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 3638787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 3649f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 3659f37622fSTyler Hicks encrypted_and_encoded_name); 366addd65adSMichael Halcrow goto out_d_drop; 367addd65adSMichael Halcrow } 368addd65adSMichael Halcrow if (lower_dentry->d_inode) 369addd65adSMichael Halcrow goto lookup_and_interpose; 370addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 371addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 3722aac0cf8STyler Hicks if (!(mount_crypt_stat 3732aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 374addd65adSMichael Halcrow goto lookup_and_interpose; 375addd65adSMichael Halcrow dput(lower_dentry); 376addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 377addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 3782aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 379addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 380addd65adSMichael Halcrow if (rc) { 381addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 382addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 383addd65adSMichael Halcrow goto out_d_drop; 384addd65adSMichael Halcrow } 3858787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 3868787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 3878787c7a3STyler Hicks lower_dir_dentry, 3888787c7a3STyler Hicks encrypted_and_encoded_name_size); 3898787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 390addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 391addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 3928787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 3939f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 394addd65adSMichael Halcrow encrypted_and_encoded_name); 395addd65adSMichael Halcrow goto out_d_drop; 396addd65adSMichael Halcrow } 397addd65adSMichael Halcrow lookup_and_interpose: 398addd65adSMichael Halcrow rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, 39970b89021STyler Hicks ecryptfs_dir_inode); 400addd65adSMichael Halcrow goto out; 401addd65adSMichael Halcrow out_d_drop: 402addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 403addd65adSMichael Halcrow out: 404addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 405237fead6SMichael Halcrow return ERR_PTR(rc); 406237fead6SMichael Halcrow } 407237fead6SMichael Halcrow 408237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 409237fead6SMichael Halcrow struct dentry *new_dentry) 410237fead6SMichael Halcrow { 411237fead6SMichael Halcrow struct dentry *lower_old_dentry; 412237fead6SMichael Halcrow struct dentry *lower_new_dentry; 413237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 414237fead6SMichael Halcrow u64 file_size_save; 415237fead6SMichael Halcrow int rc; 416237fead6SMichael Halcrow 417237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 418237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 419237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 420237fead6SMichael Halcrow dget(lower_old_dentry); 421237fead6SMichael Halcrow dget(lower_new_dentry); 422237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 423237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 424237fead6SMichael Halcrow lower_new_dentry); 425237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 426237fead6SMichael Halcrow goto out_lock; 427237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); 428237fead6SMichael Halcrow if (rc) 429237fead6SMichael Halcrow goto out_lock; 4303a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4313a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 432237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 433237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 434237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 435237fead6SMichael Halcrow out_lock: 436237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 437237fead6SMichael Halcrow dput(lower_new_dentry); 438237fead6SMichael Halcrow dput(lower_old_dentry); 439237fead6SMichael Halcrow return rc; 440237fead6SMichael Halcrow } 441237fead6SMichael Halcrow 442237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 443237fead6SMichael Halcrow { 444237fead6SMichael Halcrow int rc = 0; 445237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 446237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 4478dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 448237fead6SMichael Halcrow 4499c2d2056STyler Hicks dget(lower_dentry); 4508dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 451237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 452237fead6SMichael Halcrow if (rc) { 453ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 454237fead6SMichael Halcrow goto out_unlock; 455237fead6SMichael Halcrow } 4560cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 457237fead6SMichael Halcrow dentry->d_inode->i_nlink = 458237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 459237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 460caeeeecfSMichael Halcrow d_drop(dentry); 461237fead6SMichael Halcrow out_unlock: 4628dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 4639c2d2056STyler Hicks dput(lower_dentry); 464237fead6SMichael Halcrow return rc; 465237fead6SMichael Halcrow } 466237fead6SMichael Halcrow 467237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 468237fead6SMichael Halcrow const char *symname) 469237fead6SMichael Halcrow { 470237fead6SMichael Halcrow int rc; 471237fead6SMichael Halcrow struct dentry *lower_dentry; 472237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 473237fead6SMichael Halcrow char *encoded_symname; 474addd65adSMichael Halcrow size_t encoded_symlen; 475addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 476237fead6SMichael Halcrow 477237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 478237fead6SMichael Halcrow dget(lower_dentry); 479237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 480addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 481addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 482addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 483addd65adSMichael Halcrow &encoded_symlen, 484addd65adSMichael Halcrow NULL, 485addd65adSMichael Halcrow mount_crypt_stat, symname, 486addd65adSMichael Halcrow strlen(symname)); 487addd65adSMichael Halcrow if (rc) 488237fead6SMichael Halcrow goto out_lock; 489237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 490db2e747bSMiklos Szeredi encoded_symname); 491237fead6SMichael Halcrow kfree(encoded_symname); 492237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 493237fead6SMichael Halcrow goto out_lock; 494237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 495237fead6SMichael Halcrow if (rc) 496237fead6SMichael Halcrow goto out_lock; 4970cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4980cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 499237fead6SMichael Halcrow out_lock: 500237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 501237fead6SMichael Halcrow dput(lower_dentry); 502237fead6SMichael Halcrow if (!dentry->d_inode) 503237fead6SMichael Halcrow d_drop(dentry); 504237fead6SMichael Halcrow return rc; 505237fead6SMichael Halcrow } 506237fead6SMichael Halcrow 507237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 508237fead6SMichael Halcrow { 509237fead6SMichael Halcrow int rc; 510237fead6SMichael Halcrow struct dentry *lower_dentry; 511237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 512237fead6SMichael Halcrow 513237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 514237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 515237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 516237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 517237fead6SMichael Halcrow goto out; 518237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 519237fead6SMichael Halcrow if (rc) 520237fead6SMichael Halcrow goto out; 5210cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5220cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 523237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 524237fead6SMichael Halcrow out: 525237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 526237fead6SMichael Halcrow if (!dentry->d_inode) 527237fead6SMichael Halcrow d_drop(dentry); 528237fead6SMichael Halcrow return rc; 529237fead6SMichael Halcrow } 530237fead6SMichael Halcrow 531237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 532237fead6SMichael Halcrow { 533237fead6SMichael Halcrow struct dentry *lower_dentry; 534237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 53545ec4abaSMichael Halcrow int rc; 536237fead6SMichael Halcrow 537237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 53845ec4abaSMichael Halcrow dget(dentry); 539237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 54045ec4abaSMichael Halcrow dget(lower_dentry); 541237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 54245ec4abaSMichael Halcrow dput(lower_dentry); 5430cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 544237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 545237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 546237fead6SMichael Halcrow if (!rc) 547237fead6SMichael Halcrow d_drop(dentry); 54845ec4abaSMichael Halcrow dput(dentry); 549237fead6SMichael Halcrow return rc; 550237fead6SMichael Halcrow } 551237fead6SMichael Halcrow 552237fead6SMichael Halcrow static int 553237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 554237fead6SMichael Halcrow { 555237fead6SMichael Halcrow int rc; 556237fead6SMichael Halcrow struct dentry *lower_dentry; 557237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 558237fead6SMichael Halcrow 559237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 560237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 561237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 562237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 563237fead6SMichael Halcrow goto out; 564391b52f9SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 565237fead6SMichael Halcrow if (rc) 566237fead6SMichael Halcrow goto out; 5670cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5680cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 569237fead6SMichael Halcrow out: 570237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 571237fead6SMichael Halcrow if (!dentry->d_inode) 572237fead6SMichael Halcrow d_drop(dentry); 573237fead6SMichael Halcrow return rc; 574237fead6SMichael Halcrow } 575237fead6SMichael Halcrow 576237fead6SMichael Halcrow static int 577237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 578237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 579237fead6SMichael Halcrow { 580237fead6SMichael Halcrow int rc; 581237fead6SMichael Halcrow struct dentry *lower_old_dentry; 582237fead6SMichael Halcrow struct dentry *lower_new_dentry; 583237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 584237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 5850d132f73SErez Zadok struct dentry *trap = NULL; 586237fead6SMichael Halcrow 587237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 588237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 589237fead6SMichael Halcrow dget(lower_old_dentry); 590237fead6SMichael Halcrow dget(lower_new_dentry); 591237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 592237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 5930d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 5940d132f73SErez Zadok /* source should not be ancestor of target */ 5950d132f73SErez Zadok if (trap == lower_old_dentry) { 5960d132f73SErez Zadok rc = -EINVAL; 5970d132f73SErez Zadok goto out_lock; 5980d132f73SErez Zadok } 5990d132f73SErez Zadok /* target should not be ancestor of source */ 6000d132f73SErez Zadok if (trap == lower_new_dentry) { 6010d132f73SErez Zadok rc = -ENOTEMPTY; 6020d132f73SErez Zadok goto out_lock; 6030d132f73SErez Zadok } 604237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 605237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 606237fead6SMichael Halcrow if (rc) 607237fead6SMichael Halcrow goto out_lock; 6089afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 609237fead6SMichael Halcrow if (new_dir != old_dir) 6109afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 611237fead6SMichael Halcrow out_lock: 612237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 613dd55c898STyler Hicks dput(lower_new_dir_dentry); 614dd55c898STyler Hicks dput(lower_old_dir_dentry); 615237fead6SMichael Halcrow dput(lower_new_dentry); 616237fead6SMichael Halcrow dput(lower_old_dentry); 617237fead6SMichael Halcrow return rc; 618237fead6SMichael Halcrow } 619237fead6SMichael Halcrow 6203a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 6213a60a168STyler Hicks size_t *bufsiz) 622237fead6SMichael Halcrow { 6233a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 624237fead6SMichael Halcrow char *lower_buf; 6253a60a168STyler Hicks size_t lower_bufsiz = PATH_MAX; 626addd65adSMichael Halcrow mm_segment_t old_fs; 627addd65adSMichael Halcrow int rc; 628237fead6SMichael Halcrow 6293a6b42caSTyler Hicks lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); 6303a60a168STyler Hicks if (!lower_buf) { 631237fead6SMichael Halcrow rc = -ENOMEM; 632237fead6SMichael Halcrow goto out; 633237fead6SMichael Halcrow } 634237fead6SMichael Halcrow old_fs = get_fs(); 635237fead6SMichael Halcrow set_fs(get_ds()); 636237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 637237fead6SMichael Halcrow (char __user *)lower_buf, 6383a6b42caSTyler Hicks lower_bufsiz); 639237fead6SMichael Halcrow set_fs(old_fs); 6403a60a168STyler Hicks if (rc < 0) 6413a60a168STyler Hicks goto out; 6423a60a168STyler Hicks lower_bufsiz = rc; 6433a60a168STyler Hicks rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, 6443a60a168STyler Hicks lower_buf, lower_bufsiz); 6453a60a168STyler Hicks out: 646237fead6SMichael Halcrow kfree(lower_buf); 6473a60a168STyler Hicks return rc; 6483a60a168STyler Hicks } 6493a60a168STyler Hicks 6503a60a168STyler Hicks static int 6513a60a168STyler Hicks ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 6523a60a168STyler Hicks { 6533a60a168STyler Hicks char *kbuf; 6543a60a168STyler Hicks size_t kbufsiz, copied; 6553a60a168STyler Hicks int rc; 6563a60a168STyler Hicks 6573a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); 6583a60a168STyler Hicks if (rc) 6593a60a168STyler Hicks goto out; 6603a60a168STyler Hicks copied = min_t(size_t, bufsiz, kbufsiz); 6613a60a168STyler Hicks rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; 6623a60a168STyler Hicks kfree(kbuf); 6633a60a168STyler Hicks fsstack_copy_attr_atime(dentry->d_inode, 6643a60a168STyler Hicks ecryptfs_dentry_to_lower(dentry)->d_inode); 665237fead6SMichael Halcrow out: 666237fead6SMichael Halcrow return rc; 667237fead6SMichael Halcrow } 668237fead6SMichael Halcrow 669237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 670237fead6SMichael Halcrow { 671237fead6SMichael Halcrow char *buf; 672237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 673237fead6SMichael Halcrow mm_segment_t old_fs; 674237fead6SMichael Halcrow 675237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 676237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 677237fead6SMichael Halcrow if (!buf) { 678806892e9SOGAWA Hirofumi buf = ERR_PTR(-ENOMEM); 679237fead6SMichael Halcrow goto out; 680237fead6SMichael Halcrow } 681237fead6SMichael Halcrow old_fs = get_fs(); 682237fead6SMichael Halcrow set_fs(get_ds()); 683237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 684237fead6SMichael Halcrow set_fs(old_fs); 685806892e9SOGAWA Hirofumi if (rc < 0) { 686237fead6SMichael Halcrow kfree(buf); 687806892e9SOGAWA Hirofumi buf = ERR_PTR(rc); 688806892e9SOGAWA Hirofumi } else 689806892e9SOGAWA Hirofumi buf[rc] = '\0'; 690237fead6SMichael Halcrow out: 691806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 692806892e9SOGAWA Hirofumi return NULL; 693237fead6SMichael Halcrow } 694237fead6SMichael Halcrow 695237fead6SMichael Halcrow static void 696237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 697237fead6SMichael Halcrow { 698806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 699806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 700237fead6SMichael Halcrow /* Free the char* */ 701806892e9SOGAWA Hirofumi kfree(buf); 702806892e9SOGAWA Hirofumi } 703237fead6SMichael Halcrow } 704237fead6SMichael Halcrow 705237fead6SMichael Halcrow /** 706237fead6SMichael Halcrow * upper_size_to_lower_size 707237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 708237fead6SMichael Halcrow * @upper_size: Size of the upper file 709237fead6SMichael Halcrow * 710cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 711237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 712237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 713237fead6SMichael Halcrow * 714237fead6SMichael Halcrow * Returns Calculated size of the lower file. 715237fead6SMichael Halcrow */ 716237fead6SMichael Halcrow static loff_t 717237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 718237fead6SMichael Halcrow loff_t upper_size) 719237fead6SMichael Halcrow { 720237fead6SMichael Halcrow loff_t lower_size; 721237fead6SMichael Halcrow 722157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 723237fead6SMichael Halcrow if (upper_size != 0) { 724237fead6SMichael Halcrow loff_t num_extents; 725237fead6SMichael Halcrow 726237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 727237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 728237fead6SMichael Halcrow num_extents++; 729237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 730237fead6SMichael Halcrow } 731237fead6SMichael Halcrow return lower_size; 732237fead6SMichael Halcrow } 733237fead6SMichael Halcrow 734237fead6SMichael Halcrow /** 7355f3ef64fSTyler Hicks * truncate_upper 736237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7375f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7385f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 739237fead6SMichael Halcrow * 740237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 741237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7425f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7435f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7445f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7455f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7465f3ef64fSTyler Hicks * the truncation of the lower inode. 747237fead6SMichael Halcrow * 748237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 749237fead6SMichael Halcrow */ 7505f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7515f3ef64fSTyler Hicks struct iattr *lower_ia) 752237fead6SMichael Halcrow { 753237fead6SMichael Halcrow int rc = 0; 754237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 755237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 756237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 757237fead6SMichael Halcrow loff_t lower_size_before_truncate; 758237fead6SMichael Halcrow loff_t lower_size_after_truncate; 759237fead6SMichael Halcrow 7605f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7615f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 762332ab16fSTyler Hicks return 0; 7635f3ef64fSTyler Hicks } 764332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(dentry); 765332ab16fSTyler Hicks if (rc) 766332ab16fSTyler Hicks return rc; 767237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 768237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7695f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7702ed92554SMichael Halcrow char zero[] = { 0x00 }; 771240e2df5SMichael Halcrow 7725f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7732ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7742ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7752ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7762ed92554SMichael Halcrow * file and the new and of the file */ 77748c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7785f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7795f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7805f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7815f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 7825f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 7832ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 7842ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 7855f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 7862ed92554SMichael Halcrow 7872c27c65eSChristoph Hellwig 7882c27c65eSChristoph Hellwig /* 7892c27c65eSChristoph Hellwig * XXX(truncate) this should really happen at the begginning 7902c27c65eSChristoph Hellwig * of ->setattr. But the code is too messy to that as part 7912c27c65eSChristoph Hellwig * of a larger patch. ecryptfs is also totally missing out 7922c27c65eSChristoph Hellwig * on the inode_change_ok check at the beginning of 7932c27c65eSChristoph Hellwig * ->setattr while would include this. 7942c27c65eSChristoph Hellwig */ 7952c27c65eSChristoph Hellwig rc = inode_newsize_ok(inode, ia->ia_size); 79613a791b4STyler Hicks if (rc) 79748c1e44aSAl Viro goto out; 7982c27c65eSChristoph Hellwig 7992c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 8002c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8015f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 8025f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 80348c1e44aSAl Viro goto out; 80413a791b4STyler Hicks } 8052ed92554SMichael Halcrow if (num_zeros) { 8062ed92554SMichael Halcrow char *zeros_virt; 8072ed92554SMichael Halcrow 8082ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8092ed92554SMichael Halcrow if (!zeros_virt) { 8102ed92554SMichael Halcrow rc = -ENOMEM; 81148c1e44aSAl Viro goto out; 812240e2df5SMichael Halcrow } 81348c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8145f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8152ed92554SMichael Halcrow kfree(zeros_virt); 8165dda6992SMichael Halcrow if (rc) { 817240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 818240e2df5SMichael Halcrow "the remainder of the end page on " 819240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 82048c1e44aSAl Viro goto out; 821240e2df5SMichael Halcrow } 822240e2df5SMichael Halcrow } 8232c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8240216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 825dd2a3b7aSMichael Halcrow if (rc) { 826dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 827dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 828dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 82948c1e44aSAl Viro goto out; 830dd2a3b7aSMichael Halcrow } 831237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 832237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 833237fead6SMichael Halcrow lower_size_before_truncate = 834237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 835237fead6SMichael Halcrow lower_size_after_truncate = 8365f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8375f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8385f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8395f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8405f3ef64fSTyler Hicks } else 8415f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 842237fead6SMichael Halcrow } 843237fead6SMichael Halcrow out: 844332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 845237fead6SMichael Halcrow return rc; 846237fead6SMichael Halcrow } 847237fead6SMichael Halcrow 8485f3ef64fSTyler Hicks /** 8495f3ef64fSTyler Hicks * ecryptfs_truncate 8505f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8515f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8525f3ef64fSTyler Hicks * 8535f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8545f3ef64fSTyler Hicks * its corresponding lower inode. 8555f3ef64fSTyler Hicks * 8565f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8575f3ef64fSTyler Hicks */ 8585f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8595f3ef64fSTyler Hicks { 8605f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8615f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8625f3ef64fSTyler Hicks int rc; 8635f3ef64fSTyler Hicks 8645f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8655f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8665f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8675f3ef64fSTyler Hicks 8685f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 8695f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 8705f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 8715f3ef64fSTyler Hicks } 8725f3ef64fSTyler Hicks return rc; 8735f3ef64fSTyler Hicks } 8745f3ef64fSTyler Hicks 875237fead6SMichael Halcrow static int 876b74c79e9SNick Piggin ecryptfs_permission(struct inode *inode, int mask, unsigned int flags) 877237fead6SMichael Halcrow { 878b74c79e9SNick Piggin if (flags & IPERM_FLAG_RCU) 879b74c79e9SNick Piggin return -ECHILD; 880f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 881237fead6SMichael Halcrow } 882237fead6SMichael Halcrow 883237fead6SMichael Halcrow /** 884237fead6SMichael Halcrow * ecryptfs_setattr 885237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 886237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 887237fead6SMichael Halcrow * 888237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 889237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 890237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 891237fead6SMichael Halcrow * 892237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 893237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 894237fead6SMichael Halcrow */ 895237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 896237fead6SMichael Halcrow { 897237fead6SMichael Halcrow int rc = 0; 898237fead6SMichael Halcrow struct dentry *lower_dentry; 8995f3ef64fSTyler Hicks struct iattr lower_ia; 900237fead6SMichael Halcrow struct inode *inode; 901237fead6SMichael Halcrow struct inode *lower_inode; 902237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 903237fead6SMichael Halcrow 904237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 905e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 906e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 907237fead6SMichael Halcrow inode = dentry->d_inode; 908237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 909e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 910e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 911e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 912e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 91364ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 91464ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 91564ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 916e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 917e10f281bSMichael Halcrow 918e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 919e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 920332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(dentry); 921332ab16fSTyler Hicks if (rc) { 922332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 923332ab16fSTyler Hicks goto out; 924332ab16fSTyler Hicks } 925d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 926332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9275dda6992SMichael Halcrow if (rc) { 928e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 929e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 930e10f281bSMichael Halcrow rc = -EIO; 93125bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 932e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 93325bd8174SMichael Halcrow "or the key could not be retrieved. " 93425bd8174SMichael Halcrow "Plaintext passthrough mode is not " 935e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 936e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 937e10f281bSMichael Halcrow goto out; 938e10f281bSMichael Halcrow } 939e10f281bSMichael Halcrow rc = 0; 940e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 941e10f281bSMichael Halcrow } 942e10f281bSMichael Halcrow } 943e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 9445f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9455f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9465f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 947237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9485f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 949237fead6SMichael Halcrow if (rc < 0) 950237fead6SMichael Halcrow goto out; 951237fead6SMichael Halcrow } 9521ac564ecSJeff Layton 9531ac564ecSJeff Layton /* 9541ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9551ac564ecSJeff Layton * to interpret this in its own way. 9561ac564ecSJeff Layton */ 9575f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9585f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9591ac564ecSJeff Layton 9609c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 9615f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9629c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 963237fead6SMichael Halcrow out: 9649afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 965237fead6SMichael Halcrow return rc; 966237fead6SMichael Halcrow } 967237fead6SMichael Halcrow 9683a60a168STyler Hicks int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 9693a60a168STyler Hicks struct kstat *stat) 9703a60a168STyler Hicks { 9713a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9723a60a168STyler Hicks int rc = 0; 9733a60a168STyler Hicks 9743a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9753a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 9763a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 9773a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 9783a60a168STyler Hicks char *target; 9793a60a168STyler Hicks size_t targetsiz; 9803a60a168STyler Hicks 9813a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 9823a60a168STyler Hicks if (!rc) { 9833a60a168STyler Hicks kfree(target); 9843a60a168STyler Hicks stat->size = targetsiz; 9853a60a168STyler Hicks } 9863a60a168STyler Hicks } 9873a60a168STyler Hicks return rc; 9883a60a168STyler Hicks } 9893a60a168STyler Hicks 990f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 991f8f484d1STyler Hicks struct kstat *stat) 992f8f484d1STyler Hicks { 993f8f484d1STyler Hicks struct kstat lower_stat; 994f8f484d1STyler Hicks int rc; 995f8f484d1STyler Hicks 996f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 997f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 998f8f484d1STyler Hicks if (!rc) { 99955f9cf6bSTyler Hicks fsstack_copy_attr_all(dentry->d_inode, 100055f9cf6bSTyler Hicks ecryptfs_inode_to_lower(dentry->d_inode)); 1001f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1002f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1003f8f484d1STyler Hicks } 1004f8f484d1STyler Hicks return rc; 1005f8f484d1STyler Hicks } 1006f8f484d1STyler Hicks 1007dd2a3b7aSMichael Halcrow int 1008237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1009237fead6SMichael Halcrow size_t size, int flags) 1010237fead6SMichael Halcrow { 1011237fead6SMichael Halcrow int rc = 0; 1012237fead6SMichael Halcrow struct dentry *lower_dentry; 1013237fead6SMichael Halcrow 1014237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1015237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1016cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1017237fead6SMichael Halcrow goto out; 1018237fead6SMichael Halcrow } 101948b512e6SRoberto Sassu 102048b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 1021237fead6SMichael Halcrow out: 1022237fead6SMichael Halcrow return rc; 1023237fead6SMichael Halcrow } 1024237fead6SMichael Halcrow 1025dd2a3b7aSMichael Halcrow ssize_t 1026d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1027d7cdc5feSMichael Halcrow void *value, size_t size) 1028d7cdc5feSMichael Halcrow { 1029d7cdc5feSMichael Halcrow int rc = 0; 1030d7cdc5feSMichael Halcrow 1031d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1032cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1033d7cdc5feSMichael Halcrow goto out; 1034d7cdc5feSMichael Halcrow } 1035d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1036d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1037d7cdc5feSMichael Halcrow size); 1038d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1039d7cdc5feSMichael Halcrow out: 1040d7cdc5feSMichael Halcrow return rc; 1041d7cdc5feSMichael Halcrow } 1042d7cdc5feSMichael Halcrow 10437896b631SAdrian Bunk static ssize_t 1044237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1045237fead6SMichael Halcrow size_t size) 1046237fead6SMichael Halcrow { 10472ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 10482ed92554SMichael Halcrow value, size); 1049237fead6SMichael Halcrow } 1050237fead6SMichael Halcrow 1051237fead6SMichael Halcrow static ssize_t 1052237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1053237fead6SMichael Halcrow { 1054237fead6SMichael Halcrow int rc = 0; 1055237fead6SMichael Halcrow struct dentry *lower_dentry; 1056237fead6SMichael Halcrow 1057237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1058237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1059cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1060237fead6SMichael Halcrow goto out; 1061237fead6SMichael Halcrow } 1062237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1063237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1064237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1065237fead6SMichael Halcrow out: 1066237fead6SMichael Halcrow return rc; 1067237fead6SMichael Halcrow } 1068237fead6SMichael Halcrow 1069237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1070237fead6SMichael Halcrow { 1071237fead6SMichael Halcrow int rc = 0; 1072237fead6SMichael Halcrow struct dentry *lower_dentry; 1073237fead6SMichael Halcrow 1074237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1075237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1076cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1077237fead6SMichael Halcrow goto out; 1078237fead6SMichael Halcrow } 1079237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1080237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1081237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1082237fead6SMichael Halcrow out: 1083237fead6SMichael Halcrow return rc; 1084237fead6SMichael Halcrow } 1085237fead6SMichael Halcrow 1086237fead6SMichael Halcrow int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) 1087237fead6SMichael Halcrow { 1088237fead6SMichael Halcrow if ((ecryptfs_inode_to_lower(inode) 1089237fead6SMichael Halcrow == (struct inode *)candidate_lower_inode)) 1090237fead6SMichael Halcrow return 1; 1091237fead6SMichael Halcrow else 1092237fead6SMichael Halcrow return 0; 1093237fead6SMichael Halcrow } 1094237fead6SMichael Halcrow 1095237fead6SMichael Halcrow int ecryptfs_inode_set(struct inode *inode, void *lower_inode) 1096237fead6SMichael Halcrow { 1097237fead6SMichael Halcrow ecryptfs_init_inode(inode, (struct inode *)lower_inode); 1098237fead6SMichael Halcrow return 0; 1099237fead6SMichael Halcrow } 1100237fead6SMichael Halcrow 1101754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1102237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1103237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1104237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1105237fead6SMichael Halcrow .permission = ecryptfs_permission, 1106237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11073a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1108237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1109237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1110237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1111237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1112237fead6SMichael Halcrow }; 1113237fead6SMichael Halcrow 1114754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1115237fead6SMichael Halcrow .create = ecryptfs_create, 1116237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1117237fead6SMichael Halcrow .link = ecryptfs_link, 1118237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1119237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1120237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1121237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1122237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1123237fead6SMichael Halcrow .rename = ecryptfs_rename, 1124237fead6SMichael Halcrow .permission = ecryptfs_permission, 1125237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1126237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1127237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1128237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1129237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1130237fead6SMichael Halcrow }; 1131237fead6SMichael Halcrow 1132754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1133237fead6SMichael Halcrow .permission = ecryptfs_permission, 1134237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1135f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1136237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1137237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1138237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1139237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1140237fead6SMichael Halcrow }; 1141