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> 350a688ad7SHarvey Harrison #include <asm/unaligned.h> 36237fead6SMichael Halcrow #include "ecryptfs_kernel.h" 37237fead6SMichael Halcrow 38237fead6SMichael Halcrow static struct dentry *lock_parent(struct dentry *dentry) 39237fead6SMichael Halcrow { 40237fead6SMichael Halcrow struct dentry *dir; 41237fead6SMichael Halcrow 428dc4e373SMiklos Szeredi dir = dget_parent(dentry); 43908e0a8aSPeter Zijlstra mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); 44237fead6SMichael Halcrow return dir; 45237fead6SMichael Halcrow } 46237fead6SMichael Halcrow 47237fead6SMichael Halcrow static void unlock_dir(struct dentry *dir) 48237fead6SMichael Halcrow { 49237fead6SMichael Halcrow mutex_unlock(&dir->d_inode->i_mutex); 50237fead6SMichael Halcrow dput(dir); 51237fead6SMichael Halcrow } 52237fead6SMichael Halcrow 53237fead6SMichael Halcrow /** 54237fead6SMichael Halcrow * ecryptfs_create_underlying_file 55237fead6SMichael Halcrow * @lower_dir_inode: inode of the parent in the lower fs of the new file 56f70f582fSQinghuang Feng * @dentry: New file's dentry 57237fead6SMichael Halcrow * @mode: The mode of the new file 58237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 59237fead6SMichael Halcrow * 60237fead6SMichael Halcrow * Creates the file in the lower file system. 61237fead6SMichael Halcrow * 62237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 63237fead6SMichael Halcrow */ 64237fead6SMichael Halcrow static int 65237fead6SMichael Halcrow ecryptfs_create_underlying_file(struct inode *lower_dir_inode, 66237fead6SMichael Halcrow struct dentry *dentry, int mode, 67237fead6SMichael Halcrow struct nameidata *nd) 68237fead6SMichael Halcrow { 69237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 70237fead6SMichael Halcrow struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); 71237fead6SMichael Halcrow struct dentry *dentry_save; 72237fead6SMichael Halcrow struct vfsmount *vfsmount_save; 73237fead6SMichael Halcrow int rc; 74237fead6SMichael Halcrow 754ac91378SJan Blunck dentry_save = nd->path.dentry; 764ac91378SJan Blunck vfsmount_save = nd->path.mnt; 774ac91378SJan Blunck nd->path.dentry = lower_dentry; 784ac91378SJan Blunck nd->path.mnt = lower_mnt; 79237fead6SMichael Halcrow rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); 804ac91378SJan Blunck nd->path.dentry = dentry_save; 814ac91378SJan Blunck nd->path.mnt = vfsmount_save; 82237fead6SMichael Halcrow return rc; 83237fead6SMichael Halcrow } 84237fead6SMichael Halcrow 85237fead6SMichael Halcrow /** 86237fead6SMichael Halcrow * ecryptfs_do_create 87237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 88237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 89237fead6SMichael Halcrow * @mode: The mode of the new file 90237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 91237fead6SMichael Halcrow * 92237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 93237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 94237fead6SMichael Halcrow * stat of the lower directory inode. 95237fead6SMichael Halcrow * 96237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 97237fead6SMichael Halcrow */ 98237fead6SMichael Halcrow static int 99237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 100237fead6SMichael Halcrow struct dentry *ecryptfs_dentry, int mode, 101237fead6SMichael Halcrow struct nameidata *nd) 102237fead6SMichael Halcrow { 103237fead6SMichael Halcrow int rc; 104237fead6SMichael Halcrow struct dentry *lower_dentry; 105237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 106237fead6SMichael Halcrow 107237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 108237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 109801678c5SHirofumi Nakagawa if (IS_ERR(lower_dir_dentry)) { 110237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error locking directory of " 111237fead6SMichael Halcrow "dentry\n"); 112237fead6SMichael Halcrow rc = PTR_ERR(lower_dir_dentry); 113237fead6SMichael Halcrow goto out; 114237fead6SMichael Halcrow } 115237fead6SMichael Halcrow rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, 116237fead6SMichael Halcrow ecryptfs_dentry, mode, nd); 1174981e081SMichael Halcrow if (rc) { 118caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 11918d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 120237fead6SMichael Halcrow goto out_lock; 121237fead6SMichael Halcrow } 122237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 123237fead6SMichael Halcrow directory_inode->i_sb, 0); 124237fead6SMichael Halcrow if (rc) { 125237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); 126237fead6SMichael Halcrow goto out_lock; 127237fead6SMichael Halcrow } 1280cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); 1290cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); 130237fead6SMichael Halcrow out_lock: 131237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 132237fead6SMichael Halcrow out: 133237fead6SMichael Halcrow return rc; 134237fead6SMichael Halcrow } 135237fead6SMichael Halcrow 136237fead6SMichael Halcrow /** 137237fead6SMichael Halcrow * grow_file 138d7cdc5feSMichael Halcrow * @ecryptfs_dentry: the eCryptfs dentry 139237fead6SMichael Halcrow * 140237fead6SMichael Halcrow * This is the code which will grow the file to its correct size. 141237fead6SMichael Halcrow */ 142d7cdc5feSMichael Halcrow static int grow_file(struct dentry *ecryptfs_dentry) 143237fead6SMichael Halcrow { 144d7cdc5feSMichael Halcrow struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode; 145d7cdc5feSMichael Halcrow char zero_virt[] = { 0x00 }; 146d7cdc5feSMichael Halcrow int rc = 0; 147237fead6SMichael Halcrow 14848c1e44aSAl Viro rc = ecryptfs_write(ecryptfs_inode, zero_virt, 0, 1); 149d7cdc5feSMichael Halcrow i_size_write(ecryptfs_inode, 0); 150d7cdc5feSMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode); 151d7cdc5feSMichael Halcrow ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |= 152d7cdc5feSMichael Halcrow ECRYPTFS_NEW_FILE; 153237fead6SMichael Halcrow return rc; 154237fead6SMichael Halcrow } 155237fead6SMichael Halcrow 156237fead6SMichael Halcrow /** 157237fead6SMichael Halcrow * ecryptfs_initialize_file 158237fead6SMichael Halcrow * 159237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 160237fead6SMichael Halcrow * file with a header and first data page. 161237fead6SMichael Halcrow * 162237fead6SMichael Halcrow * Returns zero on success 163237fead6SMichael Halcrow */ 164237fead6SMichael Halcrow static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) 165237fead6SMichael Halcrow { 166d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 167d7cdc5feSMichael Halcrow &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; 168237fead6SMichael Halcrow int rc = 0; 169237fead6SMichael Halcrow 170237fead6SMichael Halcrow if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { 171237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 172e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 173d7cdc5feSMichael Halcrow goto out; 174237fead6SMichael Halcrow } 175e2bd99ecSMichael Halcrow crypt_stat->flags |= ECRYPTFS_NEW_FILE; 176237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 177237fead6SMichael Halcrow rc = ecryptfs_new_file_context(ecryptfs_dentry); 178237fead6SMichael Halcrow if (rc) { 179d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 180d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 181d7cdc5feSMichael Halcrow goto out; 182237fead6SMichael Halcrow } 183391b52f9SMichael Halcrow if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { 184391b52f9SMichael Halcrow rc = ecryptfs_init_persistent_file(ecryptfs_dentry); 185391b52f9SMichael Halcrow if (rc) { 186391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 187391b52f9SMichael Halcrow "the persistent file for the dentry with name " 188391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 189391b52f9SMichael Halcrow ecryptfs_dentry->d_name.name, rc); 190391b52f9SMichael Halcrow goto out; 191391b52f9SMichael Halcrow } 192391b52f9SMichael Halcrow } 193d7cdc5feSMichael Halcrow rc = ecryptfs_write_metadata(ecryptfs_dentry); 194237fead6SMichael Halcrow if (rc) { 195d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 196d7cdc5feSMichael Halcrow goto out; 197237fead6SMichael Halcrow } 198d7cdc5feSMichael Halcrow rc = grow_file(ecryptfs_dentry); 1995dda6992SMichael Halcrow if (rc) 200d7cdc5feSMichael Halcrow printk(KERN_ERR "Error growing file; rc = [%d]\n", rc); 201237fead6SMichael Halcrow out: 202237fead6SMichael Halcrow return rc; 203237fead6SMichael Halcrow } 204237fead6SMichael Halcrow 205237fead6SMichael Halcrow /** 206237fead6SMichael Halcrow * ecryptfs_create 207237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 208237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 209237fead6SMichael Halcrow * @mode: The mode of the new file. 210237fead6SMichael Halcrow * @nd: nameidata 211237fead6SMichael Halcrow * 212237fead6SMichael Halcrow * Creates a new file. 213237fead6SMichael Halcrow * 214237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 215237fead6SMichael Halcrow */ 216237fead6SMichael Halcrow static int 217237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 218237fead6SMichael Halcrow int mode, struct nameidata *nd) 219237fead6SMichael Halcrow { 220237fead6SMichael Halcrow int rc; 221237fead6SMichael Halcrow 222addd65adSMichael Halcrow /* ecryptfs_do_create() calls ecryptfs_interpose() */ 223237fead6SMichael Halcrow rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); 224237fead6SMichael Halcrow if (unlikely(rc)) { 225237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 226237fead6SMichael Halcrow "lower filesystem\n"); 227237fead6SMichael Halcrow goto out; 228237fead6SMichael Halcrow } 229237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 230237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 231237fead6SMichael Halcrow rc = ecryptfs_initialize_file(ecryptfs_dentry); 232237fead6SMichael Halcrow out: 233237fead6SMichael Halcrow return rc; 234237fead6SMichael Halcrow } 235237fead6SMichael Halcrow 236237fead6SMichael Halcrow /** 237addd65adSMichael Halcrow * ecryptfs_lookup_and_interpose_lower - Perform a lookup 238237fead6SMichael Halcrow */ 239addd65adSMichael Halcrow int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, 240addd65adSMichael Halcrow struct dentry *lower_dentry, 241addd65adSMichael Halcrow struct inode *ecryptfs_dir_inode, 242addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 243237fead6SMichael Halcrow { 244237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 245237fead6SMichael Halcrow struct vfsmount *lower_mnt; 246addd65adSMichael Halcrow struct inode *lower_inode; 247e77a56ddSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 2482aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 249237fead6SMichael Halcrow char *page_virt = NULL; 250237fead6SMichael Halcrow u64 file_size; 251addd65adSMichael Halcrow int rc = 0; 252237fead6SMichael Halcrow 253addd65adSMichael Halcrow lower_dir_dentry = lower_dentry->d_parent; 254addd65adSMichael Halcrow lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( 255addd65adSMichael Halcrow ecryptfs_dentry->d_parent)); 256237fead6SMichael Halcrow lower_inode = lower_dentry->d_inode; 257addd65adSMichael Halcrow fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); 258237fead6SMichael Halcrow BUG_ON(!atomic_read(&lower_dentry->d_count)); 259addd65adSMichael Halcrow ecryptfs_set_dentry_private(ecryptfs_dentry, 260237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_dentry_info_cache, 261e94b1766SChristoph Lameter GFP_KERNEL)); 262addd65adSMichael Halcrow if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { 263237fead6SMichael Halcrow rc = -ENOMEM; 264addd65adSMichael Halcrow printk(KERN_ERR "%s: Out of memory whilst attempting " 265addd65adSMichael Halcrow "to allocate ecryptfs_dentry_info struct\n", 266addd65adSMichael Halcrow __func__); 267237fead6SMichael Halcrow goto out_dput; 268237fead6SMichael Halcrow } 269addd65adSMichael Halcrow ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); 270addd65adSMichael Halcrow ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); 271237fead6SMichael Halcrow if (!lower_dentry->d_inode) { 272237fead6SMichael Halcrow /* We want to add because we couldn't find in lower */ 273addd65adSMichael Halcrow d_add(ecryptfs_dentry, NULL); 274237fead6SMichael Halcrow goto out; 275237fead6SMichael Halcrow } 276addd65adSMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 2773469b573SErez Zadok ecryptfs_dir_inode->i_sb, 2783469b573SErez Zadok ECRYPTFS_INTERPOSE_FLAG_D_ADD); 279237fead6SMichael Halcrow if (rc) { 280addd65adSMichael Halcrow printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", 281addd65adSMichael Halcrow __func__, rc); 282391b52f9SMichael Halcrow goto out; 283237fead6SMichael Halcrow } 284addd65adSMichael Halcrow if (S_ISDIR(lower_inode->i_mode)) 285237fead6SMichael Halcrow goto out; 286addd65adSMichael Halcrow if (S_ISLNK(lower_inode->i_mode)) 287237fead6SMichael Halcrow goto out; 288addd65adSMichael Halcrow if (special_file(lower_inode->i_mode)) 289202a21d6SRyusuke Konishi goto out; 290addd65adSMichael Halcrow if (!ecryptfs_nd) 291237fead6SMichael Halcrow goto out; 292237fead6SMichael Halcrow /* Released in this function */ 293addd65adSMichael Halcrow page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); 294237fead6SMichael Halcrow if (!page_virt) { 295addd65adSMichael Halcrow printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", 296addd65adSMichael Halcrow __func__); 297237fead6SMichael Halcrow rc = -ENOMEM; 298391b52f9SMichael Halcrow goto out; 299237fead6SMichael Halcrow } 300addd65adSMichael Halcrow if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { 301addd65adSMichael Halcrow rc = ecryptfs_init_persistent_file(ecryptfs_dentry); 302391b52f9SMichael Halcrow if (rc) { 303391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 304391b52f9SMichael Halcrow "the persistent file for the dentry with name " 305391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 306addd65adSMichael Halcrow ecryptfs_dentry->d_name.name, rc); 307addd65adSMichael Halcrow goto out_free_kmem; 308391b52f9SMichael Halcrow } 309391b52f9SMichael Halcrow } 3102aac0cf8STyler Hicks crypt_stat = &ecryptfs_inode_to_private( 3112aac0cf8STyler Hicks ecryptfs_dentry->d_inode)->crypt_stat; 3122aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3132aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3142aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 315d7cdc5feSMichael Halcrow rc = ecryptfs_read_and_validate_header_region(page_virt, 316addd65adSMichael Halcrow ecryptfs_dentry->d_inode); 317237fead6SMichael Halcrow if (rc) { 3181984c23fSTyler Hicks memset(page_virt, 0, PAGE_CACHE_SIZE); 319addd65adSMichael Halcrow rc = ecryptfs_read_and_validate_xattr_region(page_virt, 320addd65adSMichael Halcrow ecryptfs_dentry); 321dd2a3b7aSMichael Halcrow if (rc) { 322237fead6SMichael Halcrow rc = 0; 323addd65adSMichael Halcrow goto out_free_kmem; 324237fead6SMichael Halcrow } 325dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 326dd2a3b7aSMichael Halcrow } 327e77a56ddSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 328addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 329e77a56ddSMichael Halcrow if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { 330e77a56ddSMichael Halcrow if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) 331fa3ef1cbSTyler Hicks file_size = (crypt_stat->metadata_size 332e77a56ddSMichael Halcrow + i_size_read(lower_dentry->d_inode)); 333e77a56ddSMichael Halcrow else 334e77a56ddSMichael Halcrow file_size = i_size_read(lower_dentry->d_inode); 335e77a56ddSMichael Halcrow } else { 3360a688ad7SHarvey Harrison file_size = get_unaligned_be64(page_virt); 337e77a56ddSMichael Halcrow } 338addd65adSMichael Halcrow i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size); 339addd65adSMichael Halcrow out_free_kmem: 340237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 341237fead6SMichael Halcrow goto out; 342237fead6SMichael Halcrow out_dput: 343237fead6SMichael Halcrow dput(lower_dentry); 344addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 345237fead6SMichael Halcrow out: 346addd65adSMichael Halcrow return rc; 347addd65adSMichael Halcrow } 348addd65adSMichael Halcrow 349addd65adSMichael Halcrow /** 350addd65adSMichael Halcrow * ecryptfs_lookup 351addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 352addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 353addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 354addd65adSMichael Halcrow * 355addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 356addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 357addd65adSMichael Halcrow */ 358addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 359addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 360addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 361addd65adSMichael Halcrow { 362addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 363a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 364addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 365addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 366addd65adSMichael Halcrow int rc = 0; 367addd65adSMichael Halcrow 368addd65adSMichael Halcrow ecryptfs_dentry->d_op = &ecryptfs_dops; 369addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 370addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 371addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 372addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 373addd65adSMichael Halcrow goto out_d_drop; 374addd65adSMichael Halcrow } 375addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 376ca8e34f2STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 377addd65adSMichael Halcrow lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 378addd65adSMichael Halcrow lower_dir_dentry, 379addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 380ca8e34f2STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 381addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 382addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 3839f37622fSTyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 3849f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 3859f37622fSTyler Hicks encrypted_and_encoded_name); 386addd65adSMichael Halcrow goto out_d_drop; 387addd65adSMichael Halcrow } 388addd65adSMichael Halcrow if (lower_dentry->d_inode) 389addd65adSMichael Halcrow goto lookup_and_interpose; 390addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 391addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 3922aac0cf8STyler Hicks if (!(mount_crypt_stat 3932aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 394addd65adSMichael Halcrow goto lookup_and_interpose; 395addd65adSMichael Halcrow dput(lower_dentry); 396addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 397addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 3982aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 399addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 400addd65adSMichael Halcrow if (rc) { 401addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 402addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 403addd65adSMichael Halcrow goto out_d_drop; 404addd65adSMichael Halcrow } 405ca8e34f2STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 406addd65adSMichael Halcrow lower_dentry = lookup_one_len(encrypted_and_encoded_name, 407addd65adSMichael Halcrow lower_dir_dentry, 408addd65adSMichael Halcrow encrypted_and_encoded_name_size - 1); 409ca8e34f2STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 410addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 411addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4129f37622fSTyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4139f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 414addd65adSMichael Halcrow encrypted_and_encoded_name); 415addd65adSMichael Halcrow goto out_d_drop; 416addd65adSMichael Halcrow } 417addd65adSMichael Halcrow lookup_and_interpose: 418addd65adSMichael Halcrow rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, 4192aac0cf8STyler Hicks ecryptfs_dir_inode, 420addd65adSMichael Halcrow ecryptfs_nd); 421addd65adSMichael Halcrow goto out; 422addd65adSMichael Halcrow out_d_drop: 423addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 424addd65adSMichael Halcrow out: 425addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 426237fead6SMichael Halcrow return ERR_PTR(rc); 427237fead6SMichael Halcrow } 428237fead6SMichael Halcrow 429237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 430237fead6SMichael Halcrow struct dentry *new_dentry) 431237fead6SMichael Halcrow { 432237fead6SMichael Halcrow struct dentry *lower_old_dentry; 433237fead6SMichael Halcrow struct dentry *lower_new_dentry; 434237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 435237fead6SMichael Halcrow u64 file_size_save; 436237fead6SMichael Halcrow int rc; 437237fead6SMichael Halcrow 438237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 439237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 440237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 441237fead6SMichael Halcrow dget(lower_old_dentry); 442237fead6SMichael Halcrow dget(lower_new_dentry); 443237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 444237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 445237fead6SMichael Halcrow lower_new_dentry); 446237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 447237fead6SMichael Halcrow goto out_lock; 448237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); 449237fead6SMichael Halcrow if (rc) 450237fead6SMichael Halcrow goto out_lock; 4513a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4523a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 453237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 454237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 455237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 456237fead6SMichael Halcrow out_lock: 457237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 458237fead6SMichael Halcrow dput(lower_new_dentry); 459237fead6SMichael Halcrow dput(lower_old_dentry); 460237fead6SMichael Halcrow return rc; 461237fead6SMichael Halcrow } 462237fead6SMichael Halcrow 463237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 464237fead6SMichael Halcrow { 465237fead6SMichael Halcrow int rc = 0; 466237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 467237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 4688dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 469237fead6SMichael Halcrow 4709c2d2056STyler Hicks dget(lower_dentry); 4718dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 472237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 473237fead6SMichael Halcrow if (rc) { 474ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 475237fead6SMichael Halcrow goto out_unlock; 476237fead6SMichael Halcrow } 4770cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 478237fead6SMichael Halcrow dentry->d_inode->i_nlink = 479237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 480237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 481caeeeecfSMichael Halcrow d_drop(dentry); 482237fead6SMichael Halcrow out_unlock: 4838dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 4849c2d2056STyler Hicks dput(lower_dentry); 485237fead6SMichael Halcrow return rc; 486237fead6SMichael Halcrow } 487237fead6SMichael Halcrow 488237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 489237fead6SMichael Halcrow const char *symname) 490237fead6SMichael Halcrow { 491237fead6SMichael Halcrow int rc; 492237fead6SMichael Halcrow struct dentry *lower_dentry; 493237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 494237fead6SMichael Halcrow char *encoded_symname; 495addd65adSMichael Halcrow size_t encoded_symlen; 496addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 497237fead6SMichael Halcrow 498237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 499237fead6SMichael Halcrow dget(lower_dentry); 500237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 501addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 502addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 503addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 504addd65adSMichael Halcrow &encoded_symlen, 505addd65adSMichael Halcrow NULL, 506addd65adSMichael Halcrow mount_crypt_stat, symname, 507addd65adSMichael Halcrow strlen(symname)); 508addd65adSMichael Halcrow if (rc) 509237fead6SMichael Halcrow goto out_lock; 510237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 511db2e747bSMiklos Szeredi encoded_symname); 512237fead6SMichael Halcrow kfree(encoded_symname); 513237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 514237fead6SMichael Halcrow goto out_lock; 515237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 516237fead6SMichael Halcrow if (rc) 517237fead6SMichael Halcrow goto out_lock; 5180cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5190cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 520237fead6SMichael Halcrow out_lock: 521237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 522237fead6SMichael Halcrow dput(lower_dentry); 523237fead6SMichael Halcrow if (!dentry->d_inode) 524237fead6SMichael Halcrow d_drop(dentry); 525237fead6SMichael Halcrow return rc; 526237fead6SMichael Halcrow } 527237fead6SMichael Halcrow 528237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 529237fead6SMichael Halcrow { 530237fead6SMichael Halcrow int rc; 531237fead6SMichael Halcrow struct dentry *lower_dentry; 532237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 533237fead6SMichael Halcrow 534237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 535237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 536237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 537237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 538237fead6SMichael Halcrow goto out; 539237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 540237fead6SMichael Halcrow if (rc) 541237fead6SMichael Halcrow goto out; 5420cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5430cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 544237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 545237fead6SMichael Halcrow out: 546237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 547237fead6SMichael Halcrow if (!dentry->d_inode) 548237fead6SMichael Halcrow d_drop(dentry); 549237fead6SMichael Halcrow return rc; 550237fead6SMichael Halcrow } 551237fead6SMichael Halcrow 552237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 553237fead6SMichael Halcrow { 554237fead6SMichael Halcrow struct dentry *lower_dentry; 555237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 55645ec4abaSMichael Halcrow int rc; 557237fead6SMichael Halcrow 558237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 55945ec4abaSMichael Halcrow dget(dentry); 560237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 56145ec4abaSMichael Halcrow dget(lower_dentry); 562237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 56345ec4abaSMichael Halcrow dput(lower_dentry); 56445ec4abaSMichael Halcrow if (!rc) 56545ec4abaSMichael Halcrow d_delete(lower_dentry); 5660cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 567237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 568237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 569237fead6SMichael Halcrow if (!rc) 570237fead6SMichael Halcrow d_drop(dentry); 57145ec4abaSMichael Halcrow dput(dentry); 572237fead6SMichael Halcrow return rc; 573237fead6SMichael Halcrow } 574237fead6SMichael Halcrow 575237fead6SMichael Halcrow static int 576237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 577237fead6SMichael Halcrow { 578237fead6SMichael Halcrow int rc; 579237fead6SMichael Halcrow struct dentry *lower_dentry; 580237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 581237fead6SMichael Halcrow 582237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 583237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 584237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 585237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 586237fead6SMichael Halcrow goto out; 587391b52f9SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 588237fead6SMichael Halcrow if (rc) 589237fead6SMichael Halcrow goto out; 5900cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5910cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 592237fead6SMichael Halcrow out: 593237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 594237fead6SMichael Halcrow if (!dentry->d_inode) 595237fead6SMichael Halcrow d_drop(dentry); 596237fead6SMichael Halcrow return rc; 597237fead6SMichael Halcrow } 598237fead6SMichael Halcrow 599237fead6SMichael Halcrow static int 600237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 601237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 602237fead6SMichael Halcrow { 603237fead6SMichael Halcrow int rc; 604237fead6SMichael Halcrow struct dentry *lower_old_dentry; 605237fead6SMichael Halcrow struct dentry *lower_new_dentry; 606237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 607237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6080d132f73SErez Zadok struct dentry *trap = NULL; 609237fead6SMichael Halcrow 610237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 611237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 612237fead6SMichael Halcrow dget(lower_old_dentry); 613237fead6SMichael Halcrow dget(lower_new_dentry); 614237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 615237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6160d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6170d132f73SErez Zadok /* source should not be ancestor of target */ 6180d132f73SErez Zadok if (trap == lower_old_dentry) { 6190d132f73SErez Zadok rc = -EINVAL; 6200d132f73SErez Zadok goto out_lock; 6210d132f73SErez Zadok } 6220d132f73SErez Zadok /* target should not be ancestor of source */ 6230d132f73SErez Zadok if (trap == lower_new_dentry) { 6240d132f73SErez Zadok rc = -ENOTEMPTY; 6250d132f73SErez Zadok goto out_lock; 6260d132f73SErez Zadok } 627237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 628237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 629237fead6SMichael Halcrow if (rc) 630237fead6SMichael Halcrow goto out_lock; 6319afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 632237fead6SMichael Halcrow if (new_dir != old_dir) 6339afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 634237fead6SMichael Halcrow out_lock: 635237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 636a9083081SMichael Halcrow dput(lower_new_dentry->d_parent); 637a9083081SMichael Halcrow dput(lower_old_dentry->d_parent); 638237fead6SMichael Halcrow dput(lower_new_dentry); 639237fead6SMichael Halcrow dput(lower_old_dentry); 640237fead6SMichael Halcrow return rc; 641237fead6SMichael Halcrow } 642237fead6SMichael Halcrow 6433a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 6443a60a168STyler Hicks size_t *bufsiz) 645237fead6SMichael Halcrow { 6463a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 647237fead6SMichael Halcrow char *lower_buf; 6483a60a168STyler Hicks size_t lower_bufsiz = PATH_MAX; 649addd65adSMichael Halcrow mm_segment_t old_fs; 650addd65adSMichael Halcrow int rc; 651237fead6SMichael Halcrow 6523a6b42caSTyler Hicks lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); 6533a60a168STyler Hicks if (!lower_buf) { 654237fead6SMichael Halcrow rc = -ENOMEM; 655237fead6SMichael Halcrow goto out; 656237fead6SMichael Halcrow } 657237fead6SMichael Halcrow old_fs = get_fs(); 658237fead6SMichael Halcrow set_fs(get_ds()); 659237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 660237fead6SMichael Halcrow (char __user *)lower_buf, 6613a6b42caSTyler Hicks lower_bufsiz); 662237fead6SMichael Halcrow set_fs(old_fs); 6633a60a168STyler Hicks if (rc < 0) 6643a60a168STyler Hicks goto out; 6653a60a168STyler Hicks lower_bufsiz = rc; 6663a60a168STyler Hicks rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, 6673a60a168STyler Hicks lower_buf, lower_bufsiz); 6683a60a168STyler Hicks out: 669237fead6SMichael Halcrow kfree(lower_buf); 6703a60a168STyler Hicks return rc; 6713a60a168STyler Hicks } 6723a60a168STyler Hicks 6733a60a168STyler Hicks static int 6743a60a168STyler Hicks ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 6753a60a168STyler Hicks { 6763a60a168STyler Hicks char *kbuf; 6773a60a168STyler Hicks size_t kbufsiz, copied; 6783a60a168STyler Hicks int rc; 6793a60a168STyler Hicks 6803a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); 6813a60a168STyler Hicks if (rc) 6823a60a168STyler Hicks goto out; 6833a60a168STyler Hicks copied = min_t(size_t, bufsiz, kbufsiz); 6843a60a168STyler Hicks rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; 6853a60a168STyler Hicks kfree(kbuf); 6863a60a168STyler Hicks fsstack_copy_attr_atime(dentry->d_inode, 6873a60a168STyler Hicks ecryptfs_dentry_to_lower(dentry)->d_inode); 688237fead6SMichael Halcrow out: 689237fead6SMichael Halcrow return rc; 690237fead6SMichael Halcrow } 691237fead6SMichael Halcrow 692237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 693237fead6SMichael Halcrow { 694237fead6SMichael Halcrow char *buf; 695237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 696237fead6SMichael Halcrow mm_segment_t old_fs; 697237fead6SMichael Halcrow 698237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 699237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 700237fead6SMichael Halcrow if (!buf) { 701806892e9SOGAWA Hirofumi buf = ERR_PTR(-ENOMEM); 702237fead6SMichael Halcrow goto out; 703237fead6SMichael Halcrow } 704237fead6SMichael Halcrow old_fs = get_fs(); 705237fead6SMichael Halcrow set_fs(get_ds()); 706237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 707237fead6SMichael Halcrow set_fs(old_fs); 708806892e9SOGAWA Hirofumi if (rc < 0) { 709237fead6SMichael Halcrow kfree(buf); 710806892e9SOGAWA Hirofumi buf = ERR_PTR(rc); 711806892e9SOGAWA Hirofumi } else 712806892e9SOGAWA Hirofumi buf[rc] = '\0'; 713237fead6SMichael Halcrow out: 714806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 715806892e9SOGAWA Hirofumi return NULL; 716237fead6SMichael Halcrow } 717237fead6SMichael Halcrow 718237fead6SMichael Halcrow static void 719237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 720237fead6SMichael Halcrow { 721806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 722806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 723237fead6SMichael Halcrow /* Free the char* */ 724806892e9SOGAWA Hirofumi kfree(buf); 725806892e9SOGAWA Hirofumi } 726237fead6SMichael Halcrow } 727237fead6SMichael Halcrow 728237fead6SMichael Halcrow /** 729237fead6SMichael Halcrow * upper_size_to_lower_size 730237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 731237fead6SMichael Halcrow * @upper_size: Size of the upper file 732237fead6SMichael Halcrow * 733cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 734237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 735237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 736237fead6SMichael Halcrow * 737237fead6SMichael Halcrow * Returns Calculated size of the lower file. 738237fead6SMichael Halcrow */ 739237fead6SMichael Halcrow static loff_t 740237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 741237fead6SMichael Halcrow loff_t upper_size) 742237fead6SMichael Halcrow { 743237fead6SMichael Halcrow loff_t lower_size; 744237fead6SMichael Halcrow 745157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 746237fead6SMichael Halcrow if (upper_size != 0) { 747237fead6SMichael Halcrow loff_t num_extents; 748237fead6SMichael Halcrow 749237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 750237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 751237fead6SMichael Halcrow num_extents++; 752237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 753237fead6SMichael Halcrow } 754237fead6SMichael Halcrow return lower_size; 755237fead6SMichael Halcrow } 756237fead6SMichael Halcrow 757237fead6SMichael Halcrow /** 7585f3ef64fSTyler Hicks * truncate_upper 759237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7605f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7615f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 762237fead6SMichael Halcrow * 763237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 764237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7655f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7665f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7675f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7685f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7695f3ef64fSTyler Hicks * the truncation of the lower inode. 770237fead6SMichael Halcrow * 771237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 772237fead6SMichael Halcrow */ 7735f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7745f3ef64fSTyler Hicks struct iattr *lower_ia) 775237fead6SMichael Halcrow { 776237fead6SMichael Halcrow int rc = 0; 777237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 778237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 779237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 780237fead6SMichael Halcrow loff_t lower_size_before_truncate; 781237fead6SMichael Halcrow loff_t lower_size_after_truncate; 782237fead6SMichael Halcrow 7835f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7845f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 785237fead6SMichael Halcrow goto out; 7865f3ef64fSTyler Hicks } 787237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 788237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7895f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7902ed92554SMichael Halcrow char zero[] = { 0x00 }; 791240e2df5SMichael Halcrow 7925f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7932ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7942ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7952ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7962ed92554SMichael Halcrow * file and the new and of the file */ 79748c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7985f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7995f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 8005f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 8015f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 8025f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 8032ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 8042ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 8055f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 8062ed92554SMichael Halcrow 8072c27c65eSChristoph Hellwig 8082c27c65eSChristoph Hellwig /* 8092c27c65eSChristoph Hellwig * XXX(truncate) this should really happen at the begginning 8102c27c65eSChristoph Hellwig * of ->setattr. But the code is too messy to that as part 8112c27c65eSChristoph Hellwig * of a larger patch. ecryptfs is also totally missing out 8122c27c65eSChristoph Hellwig * on the inode_change_ok check at the beginning of 8132c27c65eSChristoph Hellwig * ->setattr while would include this. 8142c27c65eSChristoph Hellwig */ 8152c27c65eSChristoph Hellwig rc = inode_newsize_ok(inode, ia->ia_size); 81613a791b4STyler Hicks if (rc) 81748c1e44aSAl Viro goto out; 8182c27c65eSChristoph Hellwig 8192c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 8202c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8215f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 8225f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 82348c1e44aSAl Viro goto out; 82413a791b4STyler Hicks } 8252ed92554SMichael Halcrow if (num_zeros) { 8262ed92554SMichael Halcrow char *zeros_virt; 8272ed92554SMichael Halcrow 8282ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8292ed92554SMichael Halcrow if (!zeros_virt) { 8302ed92554SMichael Halcrow rc = -ENOMEM; 83148c1e44aSAl Viro goto out; 832240e2df5SMichael Halcrow } 83348c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8345f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8352ed92554SMichael Halcrow kfree(zeros_virt); 8365dda6992SMichael Halcrow if (rc) { 837240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 838240e2df5SMichael Halcrow "the remainder of the end page on " 839240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 84048c1e44aSAl Viro goto out; 841240e2df5SMichael Halcrow } 842240e2df5SMichael Halcrow } 8432c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8440216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 845dd2a3b7aSMichael Halcrow if (rc) { 846dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 847dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 848dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 84948c1e44aSAl Viro goto out; 850dd2a3b7aSMichael Halcrow } 851237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 852237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 853237fead6SMichael Halcrow lower_size_before_truncate = 854237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 855237fead6SMichael Halcrow lower_size_after_truncate = 8565f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8575f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8585f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8595f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8605f3ef64fSTyler Hicks } else 8615f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 862237fead6SMichael Halcrow } 863237fead6SMichael Halcrow out: 864237fead6SMichael Halcrow return rc; 865237fead6SMichael Halcrow } 866237fead6SMichael Halcrow 8675f3ef64fSTyler Hicks /** 8685f3ef64fSTyler Hicks * ecryptfs_truncate 8695f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8705f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8715f3ef64fSTyler Hicks * 8725f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8735f3ef64fSTyler Hicks * its corresponding lower inode. 8745f3ef64fSTyler Hicks * 8755f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8765f3ef64fSTyler Hicks */ 8775f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8785f3ef64fSTyler Hicks { 8795f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8805f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8815f3ef64fSTyler Hicks int rc; 8825f3ef64fSTyler Hicks 8835f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8845f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8855f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8865f3ef64fSTyler Hicks 8875f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 8885f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 8895f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 8905f3ef64fSTyler Hicks } 8915f3ef64fSTyler Hicks return rc; 8925f3ef64fSTyler Hicks } 8935f3ef64fSTyler Hicks 894237fead6SMichael Halcrow static int 895e6305c43SAl Viro ecryptfs_permission(struct inode *inode, int mask) 896237fead6SMichael Halcrow { 897f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 898237fead6SMichael Halcrow } 899237fead6SMichael Halcrow 900237fead6SMichael Halcrow /** 901237fead6SMichael Halcrow * ecryptfs_setattr 902237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 903237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 904237fead6SMichael Halcrow * 905237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 906237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 907237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 908237fead6SMichael Halcrow * 909237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 910237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 911237fead6SMichael Halcrow */ 912237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 913237fead6SMichael Halcrow { 914237fead6SMichael Halcrow int rc = 0; 915237fead6SMichael Halcrow struct dentry *lower_dentry; 9165f3ef64fSTyler Hicks struct iattr lower_ia; 917237fead6SMichael Halcrow struct inode *inode; 918237fead6SMichael Halcrow struct inode *lower_inode; 919237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 920237fead6SMichael Halcrow 921237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 922e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 923e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 924237fead6SMichael Halcrow inode = dentry->d_inode; 925237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 926e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 927e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 928e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 929e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 93064ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 93164ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 93264ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 933e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 934e10f281bSMichael Halcrow 935e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 936e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 937d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 9385dda6992SMichael Halcrow if (rc) { 939e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 940e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 941e10f281bSMichael Halcrow rc = -EIO; 94225bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 943e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 94425bd8174SMichael Halcrow "or the key could not be retrieved. " 94525bd8174SMichael Halcrow "Plaintext passthrough mode is not " 946e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 947e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 948e10f281bSMichael Halcrow goto out; 949e10f281bSMichael Halcrow } 950e10f281bSMichael Halcrow rc = 0; 951e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 952e10f281bSMichael Halcrow } 953e10f281bSMichael Halcrow } 954e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 9555f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9565f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9575f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 958237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9595f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 960237fead6SMichael Halcrow if (rc < 0) 961237fead6SMichael Halcrow goto out; 962237fead6SMichael Halcrow } 9631ac564ecSJeff Layton 9641ac564ecSJeff Layton /* 9651ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9661ac564ecSJeff Layton * to interpret this in its own way. 9671ac564ecSJeff Layton */ 9685f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9695f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9701ac564ecSJeff Layton 9719c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 9725f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9739c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 974237fead6SMichael Halcrow out: 9759afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 976237fead6SMichael Halcrow return rc; 977237fead6SMichael Halcrow } 978237fead6SMichael Halcrow 9793a60a168STyler Hicks int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 9803a60a168STyler Hicks struct kstat *stat) 9813a60a168STyler Hicks { 9823a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9833a60a168STyler Hicks int rc = 0; 9843a60a168STyler Hicks 9853a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9863a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 9873a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 9883a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 9893a60a168STyler Hicks char *target; 9903a60a168STyler Hicks size_t targetsiz; 9913a60a168STyler Hicks 9923a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 9933a60a168STyler Hicks if (!rc) { 9943a60a168STyler Hicks kfree(target); 9953a60a168STyler Hicks stat->size = targetsiz; 9963a60a168STyler Hicks } 9973a60a168STyler Hicks } 9983a60a168STyler Hicks return rc; 9993a60a168STyler Hicks } 10003a60a168STyler Hicks 1001f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1002f8f484d1STyler Hicks struct kstat *stat) 1003f8f484d1STyler Hicks { 1004f8f484d1STyler Hicks struct kstat lower_stat; 1005f8f484d1STyler Hicks int rc; 1006f8f484d1STyler Hicks 1007f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 1008f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 1009f8f484d1STyler Hicks if (!rc) { 1010f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1011f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1012f8f484d1STyler Hicks } 1013f8f484d1STyler Hicks return rc; 1014f8f484d1STyler Hicks } 1015f8f484d1STyler Hicks 1016dd2a3b7aSMichael Halcrow int 1017237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1018237fead6SMichael Halcrow size_t size, int flags) 1019237fead6SMichael Halcrow { 1020237fead6SMichael Halcrow int rc = 0; 1021237fead6SMichael Halcrow struct dentry *lower_dentry; 1022237fead6SMichael Halcrow 1023237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1024237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1025cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1026237fead6SMichael Halcrow goto out; 1027237fead6SMichael Halcrow } 1028237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1029237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, 1030237fead6SMichael Halcrow size, flags); 1031237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1032237fead6SMichael Halcrow out: 1033237fead6SMichael Halcrow return rc; 1034237fead6SMichael Halcrow } 1035237fead6SMichael Halcrow 1036dd2a3b7aSMichael Halcrow ssize_t 1037d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1038d7cdc5feSMichael Halcrow void *value, size_t size) 1039d7cdc5feSMichael Halcrow { 1040d7cdc5feSMichael Halcrow int rc = 0; 1041d7cdc5feSMichael Halcrow 1042d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1043cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1044d7cdc5feSMichael Halcrow goto out; 1045d7cdc5feSMichael Halcrow } 1046d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1047d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1048d7cdc5feSMichael Halcrow size); 1049d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1050d7cdc5feSMichael Halcrow out: 1051d7cdc5feSMichael Halcrow return rc; 1052d7cdc5feSMichael Halcrow } 1053d7cdc5feSMichael Halcrow 10547896b631SAdrian Bunk static ssize_t 1055237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1056237fead6SMichael Halcrow size_t size) 1057237fead6SMichael Halcrow { 10582ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 10592ed92554SMichael Halcrow value, size); 1060237fead6SMichael Halcrow } 1061237fead6SMichael Halcrow 1062237fead6SMichael Halcrow static ssize_t 1063237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1064237fead6SMichael Halcrow { 1065237fead6SMichael Halcrow int rc = 0; 1066237fead6SMichael Halcrow struct dentry *lower_dentry; 1067237fead6SMichael Halcrow 1068237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1069237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1070cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1071237fead6SMichael Halcrow goto out; 1072237fead6SMichael Halcrow } 1073237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1074237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1075237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1076237fead6SMichael Halcrow out: 1077237fead6SMichael Halcrow return rc; 1078237fead6SMichael Halcrow } 1079237fead6SMichael Halcrow 1080237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1081237fead6SMichael Halcrow { 1082237fead6SMichael Halcrow int rc = 0; 1083237fead6SMichael Halcrow struct dentry *lower_dentry; 1084237fead6SMichael Halcrow 1085237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1086237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1087cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1088237fead6SMichael Halcrow goto out; 1089237fead6SMichael Halcrow } 1090237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1091237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1092237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1093237fead6SMichael Halcrow out: 1094237fead6SMichael Halcrow return rc; 1095237fead6SMichael Halcrow } 1096237fead6SMichael Halcrow 1097237fead6SMichael Halcrow int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) 1098237fead6SMichael Halcrow { 1099237fead6SMichael Halcrow if ((ecryptfs_inode_to_lower(inode) 1100237fead6SMichael Halcrow == (struct inode *)candidate_lower_inode)) 1101237fead6SMichael Halcrow return 1; 1102237fead6SMichael Halcrow else 1103237fead6SMichael Halcrow return 0; 1104237fead6SMichael Halcrow } 1105237fead6SMichael Halcrow 1106237fead6SMichael Halcrow int ecryptfs_inode_set(struct inode *inode, void *lower_inode) 1107237fead6SMichael Halcrow { 1108237fead6SMichael Halcrow ecryptfs_init_inode(inode, (struct inode *)lower_inode); 1109237fead6SMichael Halcrow return 0; 1110237fead6SMichael Halcrow } 1111237fead6SMichael Halcrow 1112754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1113237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1114237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1115237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1116237fead6SMichael Halcrow .permission = ecryptfs_permission, 1117237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11183a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1119237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1120237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1121237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1122237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1123237fead6SMichael Halcrow }; 1124237fead6SMichael Halcrow 1125754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1126237fead6SMichael Halcrow .create = ecryptfs_create, 1127237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1128237fead6SMichael Halcrow .link = ecryptfs_link, 1129237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1130237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1131237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1132237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1133237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1134237fead6SMichael Halcrow .rename = ecryptfs_rename, 1135237fead6SMichael Halcrow .permission = ecryptfs_permission, 1136237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1137237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1138237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1139237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1140237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1141237fead6SMichael Halcrow }; 1142237fead6SMichael Halcrow 1143754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1144237fead6SMichael Halcrow .permission = ecryptfs_permission, 1145237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1146f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1147237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1148237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1149237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1150237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1151237fead6SMichael Halcrow }; 1152