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 } 171391b52f9SMichael Halcrow rc = ecryptfs_init_persistent_file(ecryptfs_dentry); 172391b52f9SMichael Halcrow if (rc) { 173391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 174391b52f9SMichael Halcrow "the persistent 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); 180237fead6SMichael Halcrow if (rc) { 181d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 182d7cdc5feSMichael Halcrow goto out; 183237fead6SMichael Halcrow } 184237fead6SMichael Halcrow out: 185237fead6SMichael Halcrow return rc; 186237fead6SMichael Halcrow } 187237fead6SMichael Halcrow 188237fead6SMichael Halcrow /** 189237fead6SMichael Halcrow * ecryptfs_create 190237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 191237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 192237fead6SMichael Halcrow * @mode: The mode of the new file. 193237fead6SMichael Halcrow * @nd: nameidata 194237fead6SMichael Halcrow * 195237fead6SMichael Halcrow * Creates a new file. 196237fead6SMichael Halcrow * 197237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 198237fead6SMichael Halcrow */ 199237fead6SMichael Halcrow static int 200237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 201237fead6SMichael Halcrow int mode, struct nameidata *nd) 202237fead6SMichael Halcrow { 203237fead6SMichael Halcrow int rc; 204237fead6SMichael Halcrow 205addd65adSMichael Halcrow /* ecryptfs_do_create() calls ecryptfs_interpose() */ 206237fead6SMichael Halcrow rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); 207237fead6SMichael Halcrow if (unlikely(rc)) { 208237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 209237fead6SMichael Halcrow "lower filesystem\n"); 210237fead6SMichael Halcrow goto out; 211237fead6SMichael Halcrow } 212237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 213237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 214237fead6SMichael Halcrow rc = ecryptfs_initialize_file(ecryptfs_dentry); 215237fead6SMichael Halcrow out: 216237fead6SMichael Halcrow return rc; 217237fead6SMichael Halcrow } 218237fead6SMichael Halcrow 219237fead6SMichael Halcrow /** 220addd65adSMichael Halcrow * ecryptfs_lookup_and_interpose_lower - Perform a lookup 221237fead6SMichael Halcrow */ 222addd65adSMichael Halcrow int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, 223addd65adSMichael Halcrow struct dentry *lower_dentry, 22470b89021STyler Hicks struct inode *ecryptfs_dir_inode) 225237fead6SMichael Halcrow { 226237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 227237fead6SMichael Halcrow struct vfsmount *lower_mnt; 228addd65adSMichael Halcrow struct inode *lower_inode; 229e77a56ddSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 2302aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 231237fead6SMichael Halcrow char *page_virt = NULL; 232237fead6SMichael Halcrow u64 file_size; 233addd65adSMichael Halcrow int rc = 0; 234237fead6SMichael Halcrow 235addd65adSMichael Halcrow lower_dir_dentry = lower_dentry->d_parent; 236addd65adSMichael Halcrow lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( 237addd65adSMichael Halcrow ecryptfs_dentry->d_parent)); 238237fead6SMichael Halcrow lower_inode = lower_dentry->d_inode; 239addd65adSMichael Halcrow fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); 240b7ab39f6SNick Piggin BUG_ON(!lower_dentry->d_count); 241addd65adSMichael Halcrow ecryptfs_set_dentry_private(ecryptfs_dentry, 242237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_dentry_info_cache, 243e94b1766SChristoph Lameter GFP_KERNEL)); 244addd65adSMichael Halcrow if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { 245237fead6SMichael Halcrow rc = -ENOMEM; 246addd65adSMichael Halcrow printk(KERN_ERR "%s: Out of memory whilst attempting " 247addd65adSMichael Halcrow "to allocate ecryptfs_dentry_info struct\n", 248addd65adSMichael Halcrow __func__); 24931f73beeSLino Sanfilippo goto out_put; 250237fead6SMichael Halcrow } 251addd65adSMichael Halcrow ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); 252addd65adSMichael Halcrow ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); 253237fead6SMichael Halcrow if (!lower_dentry->d_inode) { 254237fead6SMichael Halcrow /* We want to add because we couldn't find in lower */ 255addd65adSMichael Halcrow d_add(ecryptfs_dentry, NULL); 256237fead6SMichael Halcrow goto out; 257237fead6SMichael Halcrow } 258addd65adSMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 2593469b573SErez Zadok ecryptfs_dir_inode->i_sb, 2603469b573SErez Zadok ECRYPTFS_INTERPOSE_FLAG_D_ADD); 261237fead6SMichael Halcrow if (rc) { 262addd65adSMichael Halcrow printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", 263addd65adSMichael Halcrow __func__, rc); 264391b52f9SMichael Halcrow goto out; 265237fead6SMichael Halcrow } 266addd65adSMichael Halcrow if (S_ISDIR(lower_inode->i_mode)) 267237fead6SMichael Halcrow goto out; 268addd65adSMichael Halcrow if (S_ISLNK(lower_inode->i_mode)) 269237fead6SMichael Halcrow goto out; 270addd65adSMichael Halcrow if (special_file(lower_inode->i_mode)) 271202a21d6SRyusuke Konishi goto out; 272237fead6SMichael Halcrow /* Released in this function */ 273addd65adSMichael Halcrow page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); 274237fead6SMichael Halcrow if (!page_virt) { 275addd65adSMichael Halcrow printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", 276addd65adSMichael Halcrow __func__); 277237fead6SMichael Halcrow rc = -ENOMEM; 278391b52f9SMichael Halcrow goto out; 279237fead6SMichael Halcrow } 280addd65adSMichael Halcrow rc = ecryptfs_init_persistent_file(ecryptfs_dentry); 281391b52f9SMichael Halcrow if (rc) { 282391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 283391b52f9SMichael Halcrow "the persistent file for the dentry with name " 284391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 285addd65adSMichael Halcrow ecryptfs_dentry->d_name.name, rc); 286addd65adSMichael Halcrow goto out_free_kmem; 287391b52f9SMichael Halcrow } 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: 325addd65adSMichael Halcrow return rc; 326addd65adSMichael Halcrow } 327addd65adSMichael Halcrow 328addd65adSMichael Halcrow /** 329addd65adSMichael Halcrow * ecryptfs_lookup 330addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 331addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 332addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 333addd65adSMichael Halcrow * 334addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 335addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 336addd65adSMichael Halcrow */ 337addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 338addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 339addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 340addd65adSMichael Halcrow { 341addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 342a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 343addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 344addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 345addd65adSMichael Halcrow int rc = 0; 346addd65adSMichael Halcrow 347addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 348addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 349addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 350addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 351addd65adSMichael Halcrow goto out_d_drop; 352addd65adSMichael Halcrow } 353addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 3548787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 3558787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 3568787c7a3STyler Hicks lower_dir_dentry, 3578787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 3588787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 359addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 360addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 3618787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 3629f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 3639f37622fSTyler Hicks encrypted_and_encoded_name); 364addd65adSMichael Halcrow goto out_d_drop; 365addd65adSMichael Halcrow } 366addd65adSMichael Halcrow if (lower_dentry->d_inode) 367addd65adSMichael Halcrow goto lookup_and_interpose; 368addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 369addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 3702aac0cf8STyler Hicks if (!(mount_crypt_stat 3712aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 372addd65adSMichael Halcrow goto lookup_and_interpose; 373addd65adSMichael Halcrow dput(lower_dentry); 374addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 375addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 3762aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 377addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 378addd65adSMichael Halcrow if (rc) { 379addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 380addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 381addd65adSMichael Halcrow goto out_d_drop; 382addd65adSMichael Halcrow } 3838787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 3848787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 3858787c7a3STyler Hicks lower_dir_dentry, 3868787c7a3STyler Hicks encrypted_and_encoded_name_size); 3878787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 388addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 389addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 3908787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 3919f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 392addd65adSMichael Halcrow encrypted_and_encoded_name); 393addd65adSMichael Halcrow goto out_d_drop; 394addd65adSMichael Halcrow } 395addd65adSMichael Halcrow lookup_and_interpose: 396addd65adSMichael Halcrow rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, 39770b89021STyler Hicks ecryptfs_dir_inode); 398addd65adSMichael Halcrow goto out; 399addd65adSMichael Halcrow out_d_drop: 400addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 401addd65adSMichael Halcrow out: 402addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 403237fead6SMichael Halcrow return ERR_PTR(rc); 404237fead6SMichael Halcrow } 405237fead6SMichael Halcrow 406237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 407237fead6SMichael Halcrow struct dentry *new_dentry) 408237fead6SMichael Halcrow { 409237fead6SMichael Halcrow struct dentry *lower_old_dentry; 410237fead6SMichael Halcrow struct dentry *lower_new_dentry; 411237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 412237fead6SMichael Halcrow u64 file_size_save; 413237fead6SMichael Halcrow int rc; 414237fead6SMichael Halcrow 415237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 416237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 417237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 418237fead6SMichael Halcrow dget(lower_old_dentry); 419237fead6SMichael Halcrow dget(lower_new_dentry); 420237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 421237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 422237fead6SMichael Halcrow lower_new_dentry); 423237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 424237fead6SMichael Halcrow goto out_lock; 425237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); 426237fead6SMichael Halcrow if (rc) 427237fead6SMichael Halcrow goto out_lock; 4283a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4293a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 430237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 431237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 432237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 433237fead6SMichael Halcrow out_lock: 434237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 435237fead6SMichael Halcrow dput(lower_new_dentry); 436237fead6SMichael Halcrow dput(lower_old_dentry); 437237fead6SMichael Halcrow return rc; 438237fead6SMichael Halcrow } 439237fead6SMichael Halcrow 440237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 441237fead6SMichael Halcrow { 442237fead6SMichael Halcrow int rc = 0; 443237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 444237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 4458dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 446237fead6SMichael Halcrow 4479c2d2056STyler Hicks dget(lower_dentry); 4488dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 449237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 450237fead6SMichael Halcrow if (rc) { 451ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 452237fead6SMichael Halcrow goto out_unlock; 453237fead6SMichael Halcrow } 4540cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 455237fead6SMichael Halcrow dentry->d_inode->i_nlink = 456237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 457237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 458caeeeecfSMichael Halcrow d_drop(dentry); 459237fead6SMichael Halcrow out_unlock: 4608dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 4619c2d2056STyler Hicks dput(lower_dentry); 462237fead6SMichael Halcrow return rc; 463237fead6SMichael Halcrow } 464237fead6SMichael Halcrow 465237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 466237fead6SMichael Halcrow const char *symname) 467237fead6SMichael Halcrow { 468237fead6SMichael Halcrow int rc; 469237fead6SMichael Halcrow struct dentry *lower_dentry; 470237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 471237fead6SMichael Halcrow char *encoded_symname; 472addd65adSMichael Halcrow size_t encoded_symlen; 473addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 474237fead6SMichael Halcrow 475237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 476237fead6SMichael Halcrow dget(lower_dentry); 477237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 478addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 479addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 480addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 481addd65adSMichael Halcrow &encoded_symlen, 482addd65adSMichael Halcrow NULL, 483addd65adSMichael Halcrow mount_crypt_stat, symname, 484addd65adSMichael Halcrow strlen(symname)); 485addd65adSMichael Halcrow if (rc) 486237fead6SMichael Halcrow goto out_lock; 487237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 488db2e747bSMiklos Szeredi encoded_symname); 489237fead6SMichael Halcrow kfree(encoded_symname); 490237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 491237fead6SMichael Halcrow goto out_lock; 492237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 493237fead6SMichael Halcrow if (rc) 494237fead6SMichael Halcrow goto out_lock; 4950cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4960cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 497237fead6SMichael Halcrow out_lock: 498237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 499237fead6SMichael Halcrow dput(lower_dentry); 500237fead6SMichael Halcrow if (!dentry->d_inode) 501237fead6SMichael Halcrow d_drop(dentry); 502237fead6SMichael Halcrow return rc; 503237fead6SMichael Halcrow } 504237fead6SMichael Halcrow 505237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 506237fead6SMichael Halcrow { 507237fead6SMichael Halcrow int rc; 508237fead6SMichael Halcrow struct dentry *lower_dentry; 509237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 510237fead6SMichael Halcrow 511237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 512237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 513237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 514237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 515237fead6SMichael Halcrow goto out; 516237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 517237fead6SMichael Halcrow if (rc) 518237fead6SMichael Halcrow goto out; 5190cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5200cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 521237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 522237fead6SMichael Halcrow out: 523237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 524237fead6SMichael Halcrow if (!dentry->d_inode) 525237fead6SMichael Halcrow d_drop(dentry); 526237fead6SMichael Halcrow return rc; 527237fead6SMichael Halcrow } 528237fead6SMichael Halcrow 529237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 530237fead6SMichael Halcrow { 531237fead6SMichael Halcrow struct dentry *lower_dentry; 532237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 53345ec4abaSMichael Halcrow int rc; 534237fead6SMichael Halcrow 535237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 53645ec4abaSMichael Halcrow dget(dentry); 537237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 53845ec4abaSMichael Halcrow dget(lower_dentry); 539237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 54045ec4abaSMichael Halcrow dput(lower_dentry); 5410cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 542237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 543237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 544237fead6SMichael Halcrow if (!rc) 545237fead6SMichael Halcrow d_drop(dentry); 54645ec4abaSMichael Halcrow dput(dentry); 547237fead6SMichael Halcrow return rc; 548237fead6SMichael Halcrow } 549237fead6SMichael Halcrow 550237fead6SMichael Halcrow static int 551237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 552237fead6SMichael Halcrow { 553237fead6SMichael Halcrow int rc; 554237fead6SMichael Halcrow struct dentry *lower_dentry; 555237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 556237fead6SMichael Halcrow 557237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 558237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 559237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 560237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 561237fead6SMichael Halcrow goto out; 562391b52f9SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 563237fead6SMichael Halcrow if (rc) 564237fead6SMichael Halcrow goto out; 5650cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5660cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 567237fead6SMichael Halcrow out: 568237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 569237fead6SMichael Halcrow if (!dentry->d_inode) 570237fead6SMichael Halcrow d_drop(dentry); 571237fead6SMichael Halcrow return rc; 572237fead6SMichael Halcrow } 573237fead6SMichael Halcrow 574237fead6SMichael Halcrow static int 575237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 576237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 577237fead6SMichael Halcrow { 578237fead6SMichael Halcrow int rc; 579237fead6SMichael Halcrow struct dentry *lower_old_dentry; 580237fead6SMichael Halcrow struct dentry *lower_new_dentry; 581237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 582237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 5830d132f73SErez Zadok struct dentry *trap = NULL; 584237fead6SMichael Halcrow 585237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 586237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 587237fead6SMichael Halcrow dget(lower_old_dentry); 588237fead6SMichael Halcrow dget(lower_new_dentry); 589237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 590237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 5910d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 5920d132f73SErez Zadok /* source should not be ancestor of target */ 5930d132f73SErez Zadok if (trap == lower_old_dentry) { 5940d132f73SErez Zadok rc = -EINVAL; 5950d132f73SErez Zadok goto out_lock; 5960d132f73SErez Zadok } 5970d132f73SErez Zadok /* target should not be ancestor of source */ 5980d132f73SErez Zadok if (trap == lower_new_dentry) { 5990d132f73SErez Zadok rc = -ENOTEMPTY; 6000d132f73SErez Zadok goto out_lock; 6010d132f73SErez Zadok } 602237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 603237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 604237fead6SMichael Halcrow if (rc) 605237fead6SMichael Halcrow goto out_lock; 6069afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 607237fead6SMichael Halcrow if (new_dir != old_dir) 6089afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 609237fead6SMichael Halcrow out_lock: 610237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 611dd55c898STyler Hicks dput(lower_new_dir_dentry); 612dd55c898STyler Hicks dput(lower_old_dir_dentry); 613237fead6SMichael Halcrow dput(lower_new_dentry); 614237fead6SMichael Halcrow dput(lower_old_dentry); 615237fead6SMichael Halcrow return rc; 616237fead6SMichael Halcrow } 617237fead6SMichael Halcrow 6183a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 6193a60a168STyler Hicks size_t *bufsiz) 620237fead6SMichael Halcrow { 6213a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 622237fead6SMichael Halcrow char *lower_buf; 6233a60a168STyler Hicks size_t lower_bufsiz = PATH_MAX; 624addd65adSMichael Halcrow mm_segment_t old_fs; 625addd65adSMichael Halcrow int rc; 626237fead6SMichael Halcrow 6273a6b42caSTyler Hicks lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); 6283a60a168STyler Hicks if (!lower_buf) { 629237fead6SMichael Halcrow rc = -ENOMEM; 630237fead6SMichael Halcrow goto out; 631237fead6SMichael Halcrow } 632237fead6SMichael Halcrow old_fs = get_fs(); 633237fead6SMichael Halcrow set_fs(get_ds()); 634237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 635237fead6SMichael Halcrow (char __user *)lower_buf, 6363a6b42caSTyler Hicks lower_bufsiz); 637237fead6SMichael Halcrow set_fs(old_fs); 6383a60a168STyler Hicks if (rc < 0) 6393a60a168STyler Hicks goto out; 6403a60a168STyler Hicks lower_bufsiz = rc; 6413a60a168STyler Hicks rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, 6423a60a168STyler Hicks lower_buf, lower_bufsiz); 6433a60a168STyler Hicks out: 644237fead6SMichael Halcrow kfree(lower_buf); 6453a60a168STyler Hicks return rc; 6463a60a168STyler Hicks } 6473a60a168STyler Hicks 6483a60a168STyler Hicks static int 6493a60a168STyler Hicks ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 6503a60a168STyler Hicks { 6513a60a168STyler Hicks char *kbuf; 6523a60a168STyler Hicks size_t kbufsiz, copied; 6533a60a168STyler Hicks int rc; 6543a60a168STyler Hicks 6553a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); 6563a60a168STyler Hicks if (rc) 6573a60a168STyler Hicks goto out; 6583a60a168STyler Hicks copied = min_t(size_t, bufsiz, kbufsiz); 6593a60a168STyler Hicks rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; 6603a60a168STyler Hicks kfree(kbuf); 6613a60a168STyler Hicks fsstack_copy_attr_atime(dentry->d_inode, 6623a60a168STyler Hicks ecryptfs_dentry_to_lower(dentry)->d_inode); 663237fead6SMichael Halcrow out: 664237fead6SMichael Halcrow return rc; 665237fead6SMichael Halcrow } 666237fead6SMichael Halcrow 667237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 668237fead6SMichael Halcrow { 669237fead6SMichael Halcrow char *buf; 670237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 671237fead6SMichael Halcrow mm_segment_t old_fs; 672237fead6SMichael Halcrow 673237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 674237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 675237fead6SMichael Halcrow if (!buf) { 676806892e9SOGAWA Hirofumi buf = ERR_PTR(-ENOMEM); 677237fead6SMichael Halcrow goto out; 678237fead6SMichael Halcrow } 679237fead6SMichael Halcrow old_fs = get_fs(); 680237fead6SMichael Halcrow set_fs(get_ds()); 681237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 682237fead6SMichael Halcrow set_fs(old_fs); 683806892e9SOGAWA Hirofumi if (rc < 0) { 684237fead6SMichael Halcrow kfree(buf); 685806892e9SOGAWA Hirofumi buf = ERR_PTR(rc); 686806892e9SOGAWA Hirofumi } else 687806892e9SOGAWA Hirofumi buf[rc] = '\0'; 688237fead6SMichael Halcrow out: 689806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 690806892e9SOGAWA Hirofumi return NULL; 691237fead6SMichael Halcrow } 692237fead6SMichael Halcrow 693237fead6SMichael Halcrow static void 694237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 695237fead6SMichael Halcrow { 696806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 697806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 698237fead6SMichael Halcrow /* Free the char* */ 699806892e9SOGAWA Hirofumi kfree(buf); 700806892e9SOGAWA Hirofumi } 701237fead6SMichael Halcrow } 702237fead6SMichael Halcrow 703237fead6SMichael Halcrow /** 704237fead6SMichael Halcrow * upper_size_to_lower_size 705237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 706237fead6SMichael Halcrow * @upper_size: Size of the upper file 707237fead6SMichael Halcrow * 708cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 709237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 710237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 711237fead6SMichael Halcrow * 712237fead6SMichael Halcrow * Returns Calculated size of the lower file. 713237fead6SMichael Halcrow */ 714237fead6SMichael Halcrow static loff_t 715237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 716237fead6SMichael Halcrow loff_t upper_size) 717237fead6SMichael Halcrow { 718237fead6SMichael Halcrow loff_t lower_size; 719237fead6SMichael Halcrow 720157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 721237fead6SMichael Halcrow if (upper_size != 0) { 722237fead6SMichael Halcrow loff_t num_extents; 723237fead6SMichael Halcrow 724237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 725237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 726237fead6SMichael Halcrow num_extents++; 727237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 728237fead6SMichael Halcrow } 729237fead6SMichael Halcrow return lower_size; 730237fead6SMichael Halcrow } 731237fead6SMichael Halcrow 732237fead6SMichael Halcrow /** 7335f3ef64fSTyler Hicks * truncate_upper 734237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7355f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7365f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 737237fead6SMichael Halcrow * 738237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 739237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7405f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7415f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7425f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7435f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7445f3ef64fSTyler Hicks * the truncation of the lower inode. 745237fead6SMichael Halcrow * 746237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 747237fead6SMichael Halcrow */ 7485f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7495f3ef64fSTyler Hicks struct iattr *lower_ia) 750237fead6SMichael Halcrow { 751237fead6SMichael Halcrow int rc = 0; 752237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 753237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 754237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 755237fead6SMichael Halcrow loff_t lower_size_before_truncate; 756237fead6SMichael Halcrow loff_t lower_size_after_truncate; 757237fead6SMichael Halcrow 7585f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7595f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 760237fead6SMichael Halcrow goto out; 7615f3ef64fSTyler Hicks } 762237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 763237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7645f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7652ed92554SMichael Halcrow char zero[] = { 0x00 }; 766240e2df5SMichael Halcrow 7675f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7682ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7692ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7702ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7712ed92554SMichael Halcrow * file and the new and of the file */ 77248c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7735f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7745f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7755f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7765f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 7775f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 7782ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 7792ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 7805f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 7812ed92554SMichael Halcrow 7822c27c65eSChristoph Hellwig 7832c27c65eSChristoph Hellwig /* 7842c27c65eSChristoph Hellwig * XXX(truncate) this should really happen at the begginning 7852c27c65eSChristoph Hellwig * of ->setattr. But the code is too messy to that as part 7862c27c65eSChristoph Hellwig * of a larger patch. ecryptfs is also totally missing out 7872c27c65eSChristoph Hellwig * on the inode_change_ok check at the beginning of 7882c27c65eSChristoph Hellwig * ->setattr while would include this. 7892c27c65eSChristoph Hellwig */ 7902c27c65eSChristoph Hellwig rc = inode_newsize_ok(inode, ia->ia_size); 79113a791b4STyler Hicks if (rc) 79248c1e44aSAl Viro goto out; 7932c27c65eSChristoph Hellwig 7942c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7952c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7965f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7975f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 79848c1e44aSAl Viro goto out; 79913a791b4STyler Hicks } 8002ed92554SMichael Halcrow if (num_zeros) { 8012ed92554SMichael Halcrow char *zeros_virt; 8022ed92554SMichael Halcrow 8032ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8042ed92554SMichael Halcrow if (!zeros_virt) { 8052ed92554SMichael Halcrow rc = -ENOMEM; 80648c1e44aSAl Viro goto out; 807240e2df5SMichael Halcrow } 80848c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8095f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8102ed92554SMichael Halcrow kfree(zeros_virt); 8115dda6992SMichael Halcrow if (rc) { 812240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 813240e2df5SMichael Halcrow "the remainder of the end page on " 814240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 81548c1e44aSAl Viro goto out; 816240e2df5SMichael Halcrow } 817240e2df5SMichael Halcrow } 8182c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8190216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 820dd2a3b7aSMichael Halcrow if (rc) { 821dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 822dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 823dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 82448c1e44aSAl Viro goto out; 825dd2a3b7aSMichael Halcrow } 826237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 827237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 828237fead6SMichael Halcrow lower_size_before_truncate = 829237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 830237fead6SMichael Halcrow lower_size_after_truncate = 8315f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8325f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8335f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8345f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8355f3ef64fSTyler Hicks } else 8365f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 837237fead6SMichael Halcrow } 838237fead6SMichael Halcrow out: 839237fead6SMichael Halcrow return rc; 840237fead6SMichael Halcrow } 841237fead6SMichael Halcrow 8425f3ef64fSTyler Hicks /** 8435f3ef64fSTyler Hicks * ecryptfs_truncate 8445f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8455f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8465f3ef64fSTyler Hicks * 8475f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8485f3ef64fSTyler Hicks * its corresponding lower inode. 8495f3ef64fSTyler Hicks * 8505f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8515f3ef64fSTyler Hicks */ 8525f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8535f3ef64fSTyler Hicks { 8545f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8555f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8565f3ef64fSTyler Hicks int rc; 8575f3ef64fSTyler Hicks 8585f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8595f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8605f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8615f3ef64fSTyler Hicks 8625f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 8635f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 8645f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 8655f3ef64fSTyler Hicks } 8665f3ef64fSTyler Hicks return rc; 8675f3ef64fSTyler Hicks } 8685f3ef64fSTyler Hicks 869237fead6SMichael Halcrow static int 870b74c79e9SNick Piggin ecryptfs_permission(struct inode *inode, int mask, unsigned int flags) 871237fead6SMichael Halcrow { 872b74c79e9SNick Piggin if (flags & IPERM_FLAG_RCU) 873b74c79e9SNick Piggin return -ECHILD; 874f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 875237fead6SMichael Halcrow } 876237fead6SMichael Halcrow 877237fead6SMichael Halcrow /** 878237fead6SMichael Halcrow * ecryptfs_setattr 879237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 880237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 881237fead6SMichael Halcrow * 882237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 883237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 884237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 885237fead6SMichael Halcrow * 886237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 887237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 888237fead6SMichael Halcrow */ 889237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 890237fead6SMichael Halcrow { 891237fead6SMichael Halcrow int rc = 0; 892237fead6SMichael Halcrow struct dentry *lower_dentry; 8935f3ef64fSTyler Hicks struct iattr lower_ia; 894237fead6SMichael Halcrow struct inode *inode; 895237fead6SMichael Halcrow struct inode *lower_inode; 896237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 897237fead6SMichael Halcrow 898237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 899e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 900e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 901237fead6SMichael Halcrow inode = dentry->d_inode; 902237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 903e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 904e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 905e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 906e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 90764ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 90864ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 90964ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 910e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 911e10f281bSMichael Halcrow 912e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 913e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 914d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 9155dda6992SMichael Halcrow if (rc) { 916e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 917e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 918e10f281bSMichael Halcrow rc = -EIO; 91925bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 920e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 92125bd8174SMichael Halcrow "or the key could not be retrieved. " 92225bd8174SMichael Halcrow "Plaintext passthrough mode is not " 923e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 924e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 925e10f281bSMichael Halcrow goto out; 926e10f281bSMichael Halcrow } 927e10f281bSMichael Halcrow rc = 0; 928e10f281bSMichael Halcrow crypt_stat->flags &= ~(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