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 774ac91378SJan Blunck dentry_save = nd->path.dentry; 784ac91378SJan Blunck vfsmount_save = nd->path.mnt; 792e21b3f1STyler Hicks flags_save = nd->flags; 804ac91378SJan Blunck nd->path.dentry = lower_dentry; 814ac91378SJan Blunck nd->path.mnt = lower_mnt; 822e21b3f1STyler Hicks nd->flags &= ~LOOKUP_OPEN; 83237fead6SMichael Halcrow rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); 844ac91378SJan Blunck nd->path.dentry = dentry_save; 854ac91378SJan Blunck nd->path.mnt = vfsmount_save; 862e21b3f1STyler Hicks nd->flags = flags_save; 87237fead6SMichael Halcrow return rc; 88237fead6SMichael Halcrow } 89237fead6SMichael Halcrow 90237fead6SMichael Halcrow /** 91237fead6SMichael Halcrow * ecryptfs_do_create 92237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 93237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 94237fead6SMichael Halcrow * @mode: The mode of the new file 95237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 96237fead6SMichael Halcrow * 97237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 98237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 99237fead6SMichael Halcrow * stat of the lower directory inode. 100237fead6SMichael Halcrow * 101237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 102237fead6SMichael Halcrow */ 103237fead6SMichael Halcrow static int 104237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 105237fead6SMichael Halcrow struct dentry *ecryptfs_dentry, int mode, 106237fead6SMichael Halcrow struct nameidata *nd) 107237fead6SMichael Halcrow { 108237fead6SMichael Halcrow int rc; 109237fead6SMichael Halcrow struct dentry *lower_dentry; 110237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 111237fead6SMichael Halcrow 112237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 113237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 114801678c5SHirofumi Nakagawa if (IS_ERR(lower_dir_dentry)) { 115237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error locking directory of " 116237fead6SMichael Halcrow "dentry\n"); 117237fead6SMichael Halcrow rc = PTR_ERR(lower_dir_dentry); 118237fead6SMichael Halcrow goto out; 119237fead6SMichael Halcrow } 120237fead6SMichael Halcrow rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, 121237fead6SMichael Halcrow ecryptfs_dentry, mode, nd); 1224981e081SMichael Halcrow if (rc) { 123caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 12418d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 125237fead6SMichael Halcrow goto out_lock; 126237fead6SMichael Halcrow } 127237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 128237fead6SMichael Halcrow directory_inode->i_sb, 0); 129237fead6SMichael Halcrow if (rc) { 130237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); 131237fead6SMichael Halcrow goto out_lock; 132237fead6SMichael Halcrow } 1330cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); 1340cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); 135237fead6SMichael Halcrow out_lock: 136237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 137237fead6SMichael Halcrow out: 138237fead6SMichael Halcrow return rc; 139237fead6SMichael Halcrow } 140237fead6SMichael Halcrow 141237fead6SMichael Halcrow /** 142237fead6SMichael Halcrow * grow_file 143d7cdc5feSMichael Halcrow * @ecryptfs_dentry: the eCryptfs dentry 144237fead6SMichael Halcrow * 145237fead6SMichael Halcrow * This is the code which will grow the file to its correct size. 146237fead6SMichael Halcrow */ 147d7cdc5feSMichael Halcrow static int grow_file(struct dentry *ecryptfs_dentry) 148237fead6SMichael Halcrow { 149d7cdc5feSMichael Halcrow struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode; 150d7cdc5feSMichael Halcrow char zero_virt[] = { 0x00 }; 151d7cdc5feSMichael Halcrow int rc = 0; 152237fead6SMichael Halcrow 15348c1e44aSAl Viro rc = ecryptfs_write(ecryptfs_inode, zero_virt, 0, 1); 154d7cdc5feSMichael Halcrow i_size_write(ecryptfs_inode, 0); 155d7cdc5feSMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode); 156d7cdc5feSMichael Halcrow ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |= 157d7cdc5feSMichael Halcrow ECRYPTFS_NEW_FILE; 158237fead6SMichael Halcrow return rc; 159237fead6SMichael Halcrow } 160237fead6SMichael Halcrow 161237fead6SMichael Halcrow /** 162237fead6SMichael Halcrow * ecryptfs_initialize_file 163237fead6SMichael Halcrow * 164237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 165237fead6SMichael Halcrow * file with a header and first data page. 166237fead6SMichael Halcrow * 167237fead6SMichael Halcrow * Returns zero on success 168237fead6SMichael Halcrow */ 169237fead6SMichael Halcrow static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) 170237fead6SMichael Halcrow { 171d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 172d7cdc5feSMichael Halcrow &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; 173237fead6SMichael Halcrow int rc = 0; 174237fead6SMichael Halcrow 175237fead6SMichael Halcrow if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { 176237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 177e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 178d7cdc5feSMichael Halcrow goto out; 179237fead6SMichael Halcrow } 180e2bd99ecSMichael Halcrow crypt_stat->flags |= ECRYPTFS_NEW_FILE; 181237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 182237fead6SMichael Halcrow rc = ecryptfs_new_file_context(ecryptfs_dentry); 183237fead6SMichael Halcrow if (rc) { 184d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 185d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 186d7cdc5feSMichael Halcrow goto out; 187237fead6SMichael Halcrow } 188391b52f9SMichael Halcrow rc = ecryptfs_init_persistent_file(ecryptfs_dentry); 189391b52f9SMichael Halcrow if (rc) { 190391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 191391b52f9SMichael Halcrow "the persistent file for the dentry with name " 192391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 193391b52f9SMichael Halcrow ecryptfs_dentry->d_name.name, rc); 194391b52f9SMichael Halcrow goto out; 195391b52f9SMichael Halcrow } 196d7cdc5feSMichael Halcrow rc = ecryptfs_write_metadata(ecryptfs_dentry); 197237fead6SMichael Halcrow if (rc) { 198d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 199d7cdc5feSMichael Halcrow goto out; 200237fead6SMichael Halcrow } 201d7cdc5feSMichael Halcrow rc = grow_file(ecryptfs_dentry); 2025dda6992SMichael Halcrow if (rc) 203d7cdc5feSMichael Halcrow printk(KERN_ERR "Error growing file; rc = [%d]\n", rc); 204237fead6SMichael Halcrow out: 205237fead6SMichael Halcrow return rc; 206237fead6SMichael Halcrow } 207237fead6SMichael Halcrow 208237fead6SMichael Halcrow /** 209237fead6SMichael Halcrow * ecryptfs_create 210237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 211237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 212237fead6SMichael Halcrow * @mode: The mode of the new file. 213237fead6SMichael Halcrow * @nd: nameidata 214237fead6SMichael Halcrow * 215237fead6SMichael Halcrow * Creates a new file. 216237fead6SMichael Halcrow * 217237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 218237fead6SMichael Halcrow */ 219237fead6SMichael Halcrow static int 220237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 221237fead6SMichael Halcrow int mode, struct nameidata *nd) 222237fead6SMichael Halcrow { 223237fead6SMichael Halcrow int rc; 224237fead6SMichael Halcrow 225addd65adSMichael Halcrow /* ecryptfs_do_create() calls ecryptfs_interpose() */ 226237fead6SMichael Halcrow rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); 227237fead6SMichael Halcrow if (unlikely(rc)) { 228237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 229237fead6SMichael Halcrow "lower filesystem\n"); 230237fead6SMichael Halcrow goto out; 231237fead6SMichael Halcrow } 232237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 233237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 234237fead6SMichael Halcrow rc = ecryptfs_initialize_file(ecryptfs_dentry); 235237fead6SMichael Halcrow out: 236237fead6SMichael Halcrow return rc; 237237fead6SMichael Halcrow } 238237fead6SMichael Halcrow 239237fead6SMichael Halcrow /** 240addd65adSMichael Halcrow * ecryptfs_lookup_and_interpose_lower - Perform a lookup 241237fead6SMichael Halcrow */ 242addd65adSMichael Halcrow int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, 243addd65adSMichael Halcrow struct dentry *lower_dentry, 244addd65adSMichael Halcrow struct inode *ecryptfs_dir_inode, 245addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 246237fead6SMichael Halcrow { 247237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 248237fead6SMichael Halcrow struct vfsmount *lower_mnt; 249addd65adSMichael Halcrow struct inode *lower_inode; 250e77a56ddSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 2512aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 252237fead6SMichael Halcrow char *page_virt = NULL; 253237fead6SMichael Halcrow u64 file_size; 254addd65adSMichael Halcrow int rc = 0; 255237fead6SMichael Halcrow 256addd65adSMichael Halcrow lower_dir_dentry = lower_dentry->d_parent; 257addd65adSMichael Halcrow lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( 258addd65adSMichael Halcrow ecryptfs_dentry->d_parent)); 259237fead6SMichael Halcrow lower_inode = lower_dentry->d_inode; 260addd65adSMichael Halcrow fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); 261b7ab39f6SNick Piggin BUG_ON(!lower_dentry->d_count); 262addd65adSMichael Halcrow ecryptfs_set_dentry_private(ecryptfs_dentry, 263237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_dentry_info_cache, 264e94b1766SChristoph Lameter GFP_KERNEL)); 265addd65adSMichael Halcrow if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { 266237fead6SMichael Halcrow rc = -ENOMEM; 267addd65adSMichael Halcrow printk(KERN_ERR "%s: Out of memory whilst attempting " 268addd65adSMichael Halcrow "to allocate ecryptfs_dentry_info struct\n", 269addd65adSMichael Halcrow __func__); 27031f73beeSLino Sanfilippo goto out_put; 271237fead6SMichael Halcrow } 272addd65adSMichael Halcrow ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); 273addd65adSMichael Halcrow ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); 274237fead6SMichael Halcrow if (!lower_dentry->d_inode) { 275237fead6SMichael Halcrow /* We want to add because we couldn't find in lower */ 276addd65adSMichael Halcrow d_add(ecryptfs_dentry, NULL); 277237fead6SMichael Halcrow goto out; 278237fead6SMichael Halcrow } 279addd65adSMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 2803469b573SErez Zadok ecryptfs_dir_inode->i_sb, 2813469b573SErez Zadok ECRYPTFS_INTERPOSE_FLAG_D_ADD); 282237fead6SMichael Halcrow if (rc) { 283addd65adSMichael Halcrow printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", 284addd65adSMichael Halcrow __func__, rc); 285391b52f9SMichael Halcrow goto out; 286237fead6SMichael Halcrow } 287addd65adSMichael Halcrow if (S_ISDIR(lower_inode->i_mode)) 288237fead6SMichael Halcrow goto out; 289addd65adSMichael Halcrow if (S_ISLNK(lower_inode->i_mode)) 290237fead6SMichael Halcrow goto out; 291addd65adSMichael Halcrow if (special_file(lower_inode->i_mode)) 292202a21d6SRyusuke Konishi goto out; 293addd65adSMichael Halcrow if (!ecryptfs_nd) 294237fead6SMichael Halcrow goto out; 295237fead6SMichael Halcrow /* Released in this function */ 296addd65adSMichael Halcrow page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); 297237fead6SMichael Halcrow if (!page_virt) { 298addd65adSMichael Halcrow printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", 299addd65adSMichael Halcrow __func__); 300237fead6SMichael Halcrow rc = -ENOMEM; 301391b52f9SMichael Halcrow goto out; 302237fead6SMichael Halcrow } 303addd65adSMichael Halcrow rc = ecryptfs_init_persistent_file(ecryptfs_dentry); 304391b52f9SMichael Halcrow if (rc) { 305391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 306391b52f9SMichael Halcrow "the persistent file for the dentry with name " 307391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 308addd65adSMichael Halcrow ecryptfs_dentry->d_name.name, rc); 309addd65adSMichael Halcrow goto out_free_kmem; 310391b52f9SMichael Halcrow } 3112aac0cf8STyler Hicks crypt_stat = &ecryptfs_inode_to_private( 3122aac0cf8STyler Hicks ecryptfs_dentry->d_inode)->crypt_stat; 3132aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3142aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3152aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 316d7cdc5feSMichael Halcrow rc = ecryptfs_read_and_validate_header_region(page_virt, 317addd65adSMichael Halcrow ecryptfs_dentry->d_inode); 318237fead6SMichael Halcrow if (rc) { 3191984c23fSTyler Hicks memset(page_virt, 0, PAGE_CACHE_SIZE); 320addd65adSMichael Halcrow rc = ecryptfs_read_and_validate_xattr_region(page_virt, 321addd65adSMichael Halcrow ecryptfs_dentry); 322dd2a3b7aSMichael Halcrow if (rc) { 323237fead6SMichael Halcrow rc = 0; 324addd65adSMichael Halcrow goto out_free_kmem; 325237fead6SMichael Halcrow } 326dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 327dd2a3b7aSMichael Halcrow } 328e77a56ddSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 329addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 330e77a56ddSMichael Halcrow if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { 331e77a56ddSMichael Halcrow if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) 332fa3ef1cbSTyler Hicks file_size = (crypt_stat->metadata_size 333e77a56ddSMichael Halcrow + i_size_read(lower_dentry->d_inode)); 334e77a56ddSMichael Halcrow else 335e77a56ddSMichael Halcrow file_size = i_size_read(lower_dentry->d_inode); 336e77a56ddSMichael Halcrow } else { 3370a688ad7SHarvey Harrison file_size = get_unaligned_be64(page_virt); 338e77a56ddSMichael Halcrow } 339addd65adSMichael Halcrow i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size); 340addd65adSMichael Halcrow out_free_kmem: 341237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 342237fead6SMichael Halcrow goto out; 34331f73beeSLino Sanfilippo out_put: 344237fead6SMichael Halcrow dput(lower_dentry); 34531f73beeSLino Sanfilippo mntput(lower_mnt); 346addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 347237fead6SMichael Halcrow out: 348addd65adSMichael Halcrow return rc; 349addd65adSMichael Halcrow } 350addd65adSMichael Halcrow 351addd65adSMichael Halcrow /** 352addd65adSMichael Halcrow * ecryptfs_lookup 353addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 354addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 355addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 356addd65adSMichael Halcrow * 357addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 358addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 359addd65adSMichael Halcrow */ 360addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 361addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 362addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 363addd65adSMichael Halcrow { 364addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 365a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 366addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 367addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 368addd65adSMichael Halcrow int rc = 0; 369addd65adSMichael Halcrow 370addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 371addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 372addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 373addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 374addd65adSMichael Halcrow goto out_d_drop; 375addd65adSMichael Halcrow } 376addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 3778787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 3788787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 3798787c7a3STyler Hicks lower_dir_dentry, 3808787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 3818787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 382addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 383addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 3848787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 3859f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 3869f37622fSTyler Hicks encrypted_and_encoded_name); 387addd65adSMichael Halcrow goto out_d_drop; 388addd65adSMichael Halcrow } 389addd65adSMichael Halcrow if (lower_dentry->d_inode) 390addd65adSMichael Halcrow goto lookup_and_interpose; 391addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 392addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 3932aac0cf8STyler Hicks if (!(mount_crypt_stat 3942aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 395addd65adSMichael Halcrow goto lookup_and_interpose; 396addd65adSMichael Halcrow dput(lower_dentry); 397addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 398addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 3992aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 400addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 401addd65adSMichael Halcrow if (rc) { 402addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 403addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 404addd65adSMichael Halcrow goto out_d_drop; 405addd65adSMichael Halcrow } 4068787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4078787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 4088787c7a3STyler Hicks lower_dir_dentry, 4098787c7a3STyler Hicks encrypted_and_encoded_name_size); 4108787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 411addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 412addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4138787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4149f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 415addd65adSMichael Halcrow encrypted_and_encoded_name); 416addd65adSMichael Halcrow goto out_d_drop; 417addd65adSMichael Halcrow } 418addd65adSMichael Halcrow lookup_and_interpose: 419addd65adSMichael Halcrow rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, 4202aac0cf8STyler Hicks ecryptfs_dir_inode, 421addd65adSMichael Halcrow ecryptfs_nd); 422addd65adSMichael Halcrow goto out; 423addd65adSMichael Halcrow out_d_drop: 424addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 425addd65adSMichael Halcrow out: 426addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 427237fead6SMichael Halcrow return ERR_PTR(rc); 428237fead6SMichael Halcrow } 429237fead6SMichael Halcrow 430237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 431237fead6SMichael Halcrow struct dentry *new_dentry) 432237fead6SMichael Halcrow { 433237fead6SMichael Halcrow struct dentry *lower_old_dentry; 434237fead6SMichael Halcrow struct dentry *lower_new_dentry; 435237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 436237fead6SMichael Halcrow u64 file_size_save; 437237fead6SMichael Halcrow int rc; 438237fead6SMichael Halcrow 439237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 440237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 441237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 442237fead6SMichael Halcrow dget(lower_old_dentry); 443237fead6SMichael Halcrow dget(lower_new_dentry); 444237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 445237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 446237fead6SMichael Halcrow lower_new_dentry); 447237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 448237fead6SMichael Halcrow goto out_lock; 449237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); 450237fead6SMichael Halcrow if (rc) 451237fead6SMichael Halcrow goto out_lock; 4523a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4533a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 454237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 455237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 456237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 457237fead6SMichael Halcrow out_lock: 458237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 459237fead6SMichael Halcrow dput(lower_new_dentry); 460237fead6SMichael Halcrow dput(lower_old_dentry); 461237fead6SMichael Halcrow return rc; 462237fead6SMichael Halcrow } 463237fead6SMichael Halcrow 464237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 465237fead6SMichael Halcrow { 466237fead6SMichael Halcrow int rc = 0; 467237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 468237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 4698dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 470237fead6SMichael Halcrow 4719c2d2056STyler Hicks dget(lower_dentry); 4728dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 473237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 474237fead6SMichael Halcrow if (rc) { 475ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 476237fead6SMichael Halcrow goto out_unlock; 477237fead6SMichael Halcrow } 4780cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 479237fead6SMichael Halcrow dentry->d_inode->i_nlink = 480237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 481237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 482caeeeecfSMichael Halcrow d_drop(dentry); 483237fead6SMichael Halcrow out_unlock: 4848dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 4859c2d2056STyler Hicks dput(lower_dentry); 486237fead6SMichael Halcrow return rc; 487237fead6SMichael Halcrow } 488237fead6SMichael Halcrow 489237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 490237fead6SMichael Halcrow const char *symname) 491237fead6SMichael Halcrow { 492237fead6SMichael Halcrow int rc; 493237fead6SMichael Halcrow struct dentry *lower_dentry; 494237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 495237fead6SMichael Halcrow char *encoded_symname; 496addd65adSMichael Halcrow size_t encoded_symlen; 497addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 498237fead6SMichael Halcrow 499237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 500237fead6SMichael Halcrow dget(lower_dentry); 501237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 502addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 503addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 504addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 505addd65adSMichael Halcrow &encoded_symlen, 506addd65adSMichael Halcrow NULL, 507addd65adSMichael Halcrow mount_crypt_stat, symname, 508addd65adSMichael Halcrow strlen(symname)); 509addd65adSMichael Halcrow if (rc) 510237fead6SMichael Halcrow goto out_lock; 511237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 512db2e747bSMiklos Szeredi encoded_symname); 513237fead6SMichael Halcrow kfree(encoded_symname); 514237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 515237fead6SMichael Halcrow goto out_lock; 516237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 517237fead6SMichael Halcrow if (rc) 518237fead6SMichael Halcrow goto out_lock; 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 out_lock: 522237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 523237fead6SMichael Halcrow dput(lower_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_mkdir(struct inode *dir, struct dentry *dentry, int mode) 530237fead6SMichael Halcrow { 531237fead6SMichael Halcrow int rc; 532237fead6SMichael Halcrow struct dentry *lower_dentry; 533237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 534237fead6SMichael Halcrow 535237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 536237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 537237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 538237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 539237fead6SMichael Halcrow goto out; 540237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 541237fead6SMichael Halcrow if (rc) 542237fead6SMichael Halcrow goto out; 5430cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5440cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 545237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 546237fead6SMichael Halcrow out: 547237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 548237fead6SMichael Halcrow if (!dentry->d_inode) 549237fead6SMichael Halcrow d_drop(dentry); 550237fead6SMichael Halcrow return rc; 551237fead6SMichael Halcrow } 552237fead6SMichael Halcrow 553237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 554237fead6SMichael Halcrow { 555237fead6SMichael Halcrow struct dentry *lower_dentry; 556237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 55745ec4abaSMichael Halcrow int rc; 558237fead6SMichael Halcrow 559237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 56045ec4abaSMichael Halcrow dget(dentry); 561237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 56245ec4abaSMichael Halcrow dget(lower_dentry); 563237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 56445ec4abaSMichael Halcrow dput(lower_dentry); 56545ec4abaSMichael Halcrow if (!rc) 56645ec4abaSMichael Halcrow d_delete(lower_dentry); 5670cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 568237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 569237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 570237fead6SMichael Halcrow if (!rc) 571237fead6SMichael Halcrow d_drop(dentry); 57245ec4abaSMichael Halcrow dput(dentry); 573237fead6SMichael Halcrow return rc; 574237fead6SMichael Halcrow } 575237fead6SMichael Halcrow 576237fead6SMichael Halcrow static int 577237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 578237fead6SMichael Halcrow { 579237fead6SMichael Halcrow int rc; 580237fead6SMichael Halcrow struct dentry *lower_dentry; 581237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 582237fead6SMichael Halcrow 583237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 584237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 585237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 586237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 587237fead6SMichael Halcrow goto out; 588391b52f9SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 589237fead6SMichael Halcrow if (rc) 590237fead6SMichael Halcrow goto out; 5910cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5920cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 593237fead6SMichael Halcrow out: 594237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 595237fead6SMichael Halcrow if (!dentry->d_inode) 596237fead6SMichael Halcrow d_drop(dentry); 597237fead6SMichael Halcrow return rc; 598237fead6SMichael Halcrow } 599237fead6SMichael Halcrow 600237fead6SMichael Halcrow static int 601237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 602237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 603237fead6SMichael Halcrow { 604237fead6SMichael Halcrow int rc; 605237fead6SMichael Halcrow struct dentry *lower_old_dentry; 606237fead6SMichael Halcrow struct dentry *lower_new_dentry; 607237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 608237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6090d132f73SErez Zadok struct dentry *trap = NULL; 610237fead6SMichael Halcrow 611237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 612237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 613237fead6SMichael Halcrow dget(lower_old_dentry); 614237fead6SMichael Halcrow dget(lower_new_dentry); 615237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 616237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6170d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6180d132f73SErez Zadok /* source should not be ancestor of target */ 6190d132f73SErez Zadok if (trap == lower_old_dentry) { 6200d132f73SErez Zadok rc = -EINVAL; 6210d132f73SErez Zadok goto out_lock; 6220d132f73SErez Zadok } 6230d132f73SErez Zadok /* target should not be ancestor of source */ 6240d132f73SErez Zadok if (trap == lower_new_dentry) { 6250d132f73SErez Zadok rc = -ENOTEMPTY; 6260d132f73SErez Zadok goto out_lock; 6270d132f73SErez Zadok } 628237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 629237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 630237fead6SMichael Halcrow if (rc) 631237fead6SMichael Halcrow goto out_lock; 6329afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 633237fead6SMichael Halcrow if (new_dir != old_dir) 6349afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 635237fead6SMichael Halcrow out_lock: 636237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 637a9083081SMichael Halcrow dput(lower_new_dentry->d_parent); 638a9083081SMichael Halcrow dput(lower_old_dentry->d_parent); 639237fead6SMichael Halcrow dput(lower_new_dentry); 640237fead6SMichael Halcrow dput(lower_old_dentry); 641237fead6SMichael Halcrow return rc; 642237fead6SMichael Halcrow } 643237fead6SMichael Halcrow 6443a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 6453a60a168STyler Hicks size_t *bufsiz) 646237fead6SMichael Halcrow { 6473a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 648237fead6SMichael Halcrow char *lower_buf; 6493a60a168STyler Hicks size_t lower_bufsiz = PATH_MAX; 650addd65adSMichael Halcrow mm_segment_t old_fs; 651addd65adSMichael Halcrow int rc; 652237fead6SMichael Halcrow 6533a6b42caSTyler Hicks lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); 6543a60a168STyler Hicks if (!lower_buf) { 655237fead6SMichael Halcrow rc = -ENOMEM; 656237fead6SMichael Halcrow goto out; 657237fead6SMichael Halcrow } 658237fead6SMichael Halcrow old_fs = get_fs(); 659237fead6SMichael Halcrow set_fs(get_ds()); 660237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 661237fead6SMichael Halcrow (char __user *)lower_buf, 6623a6b42caSTyler Hicks lower_bufsiz); 663237fead6SMichael Halcrow set_fs(old_fs); 6643a60a168STyler Hicks if (rc < 0) 6653a60a168STyler Hicks goto out; 6663a60a168STyler Hicks lower_bufsiz = rc; 6673a60a168STyler Hicks rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, 6683a60a168STyler Hicks lower_buf, lower_bufsiz); 6693a60a168STyler Hicks out: 670237fead6SMichael Halcrow kfree(lower_buf); 6713a60a168STyler Hicks return rc; 6723a60a168STyler Hicks } 6733a60a168STyler Hicks 6743a60a168STyler Hicks static int 6753a60a168STyler Hicks ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 6763a60a168STyler Hicks { 6773a60a168STyler Hicks char *kbuf; 6783a60a168STyler Hicks size_t kbufsiz, copied; 6793a60a168STyler Hicks int rc; 6803a60a168STyler Hicks 6813a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); 6823a60a168STyler Hicks if (rc) 6833a60a168STyler Hicks goto out; 6843a60a168STyler Hicks copied = min_t(size_t, bufsiz, kbufsiz); 6853a60a168STyler Hicks rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; 6863a60a168STyler Hicks kfree(kbuf); 6873a60a168STyler Hicks fsstack_copy_attr_atime(dentry->d_inode, 6883a60a168STyler Hicks ecryptfs_dentry_to_lower(dentry)->d_inode); 689237fead6SMichael Halcrow out: 690237fead6SMichael Halcrow return rc; 691237fead6SMichael Halcrow } 692237fead6SMichael Halcrow 693237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 694237fead6SMichael Halcrow { 695237fead6SMichael Halcrow char *buf; 696237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 697237fead6SMichael Halcrow mm_segment_t old_fs; 698237fead6SMichael Halcrow 699237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 700237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 701237fead6SMichael Halcrow if (!buf) { 702806892e9SOGAWA Hirofumi buf = ERR_PTR(-ENOMEM); 703237fead6SMichael Halcrow goto out; 704237fead6SMichael Halcrow } 705237fead6SMichael Halcrow old_fs = get_fs(); 706237fead6SMichael Halcrow set_fs(get_ds()); 707237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 708237fead6SMichael Halcrow set_fs(old_fs); 709806892e9SOGAWA Hirofumi if (rc < 0) { 710237fead6SMichael Halcrow kfree(buf); 711806892e9SOGAWA Hirofumi buf = ERR_PTR(rc); 712806892e9SOGAWA Hirofumi } else 713806892e9SOGAWA Hirofumi buf[rc] = '\0'; 714237fead6SMichael Halcrow out: 715806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 716806892e9SOGAWA Hirofumi return NULL; 717237fead6SMichael Halcrow } 718237fead6SMichael Halcrow 719237fead6SMichael Halcrow static void 720237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 721237fead6SMichael Halcrow { 722806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 723806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 724237fead6SMichael Halcrow /* Free the char* */ 725806892e9SOGAWA Hirofumi kfree(buf); 726806892e9SOGAWA Hirofumi } 727237fead6SMichael Halcrow } 728237fead6SMichael Halcrow 729237fead6SMichael Halcrow /** 730237fead6SMichael Halcrow * upper_size_to_lower_size 731237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 732237fead6SMichael Halcrow * @upper_size: Size of the upper file 733237fead6SMichael Halcrow * 734cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 735237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 736237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 737237fead6SMichael Halcrow * 738237fead6SMichael Halcrow * Returns Calculated size of the lower file. 739237fead6SMichael Halcrow */ 740237fead6SMichael Halcrow static loff_t 741237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 742237fead6SMichael Halcrow loff_t upper_size) 743237fead6SMichael Halcrow { 744237fead6SMichael Halcrow loff_t lower_size; 745237fead6SMichael Halcrow 746157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 747237fead6SMichael Halcrow if (upper_size != 0) { 748237fead6SMichael Halcrow loff_t num_extents; 749237fead6SMichael Halcrow 750237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 751237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 752237fead6SMichael Halcrow num_extents++; 753237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 754237fead6SMichael Halcrow } 755237fead6SMichael Halcrow return lower_size; 756237fead6SMichael Halcrow } 757237fead6SMichael Halcrow 758237fead6SMichael Halcrow /** 7595f3ef64fSTyler Hicks * truncate_upper 760237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7615f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7625f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 763237fead6SMichael Halcrow * 764237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 765237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7665f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7675f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7685f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7695f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7705f3ef64fSTyler Hicks * the truncation of the lower inode. 771237fead6SMichael Halcrow * 772237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 773237fead6SMichael Halcrow */ 7745f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7755f3ef64fSTyler Hicks struct iattr *lower_ia) 776237fead6SMichael Halcrow { 777237fead6SMichael Halcrow int rc = 0; 778237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 779237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 780237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 781237fead6SMichael Halcrow loff_t lower_size_before_truncate; 782237fead6SMichael Halcrow loff_t lower_size_after_truncate; 783237fead6SMichael Halcrow 7845f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7855f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 786237fead6SMichael Halcrow goto out; 7875f3ef64fSTyler Hicks } 788237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 789237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7905f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7912ed92554SMichael Halcrow char zero[] = { 0x00 }; 792240e2df5SMichael Halcrow 7935f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7942ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7952ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7962ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7972ed92554SMichael Halcrow * file and the new and of the file */ 79848c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7995f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 8005f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 8015f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 8025f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 8035f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 8042ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 8052ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 8065f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 8072ed92554SMichael Halcrow 8082c27c65eSChristoph Hellwig 8092c27c65eSChristoph Hellwig /* 8102c27c65eSChristoph Hellwig * XXX(truncate) this should really happen at the begginning 8112c27c65eSChristoph Hellwig * of ->setattr. But the code is too messy to that as part 8122c27c65eSChristoph Hellwig * of a larger patch. ecryptfs is also totally missing out 8132c27c65eSChristoph Hellwig * on the inode_change_ok check at the beginning of 8142c27c65eSChristoph Hellwig * ->setattr while would include this. 8152c27c65eSChristoph Hellwig */ 8162c27c65eSChristoph Hellwig rc = inode_newsize_ok(inode, ia->ia_size); 81713a791b4STyler Hicks if (rc) 81848c1e44aSAl Viro goto out; 8192c27c65eSChristoph Hellwig 8202c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 8212c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8225f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 8235f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 82448c1e44aSAl Viro goto out; 82513a791b4STyler Hicks } 8262ed92554SMichael Halcrow if (num_zeros) { 8272ed92554SMichael Halcrow char *zeros_virt; 8282ed92554SMichael Halcrow 8292ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8302ed92554SMichael Halcrow if (!zeros_virt) { 8312ed92554SMichael Halcrow rc = -ENOMEM; 83248c1e44aSAl Viro goto out; 833240e2df5SMichael Halcrow } 83448c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8355f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8362ed92554SMichael Halcrow kfree(zeros_virt); 8375dda6992SMichael Halcrow if (rc) { 838240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 839240e2df5SMichael Halcrow "the remainder of the end page on " 840240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 84148c1e44aSAl Viro goto out; 842240e2df5SMichael Halcrow } 843240e2df5SMichael Halcrow } 8442c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8450216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 846dd2a3b7aSMichael Halcrow if (rc) { 847dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 848dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 849dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 85048c1e44aSAl Viro goto out; 851dd2a3b7aSMichael Halcrow } 852237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 853237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 854237fead6SMichael Halcrow lower_size_before_truncate = 855237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 856237fead6SMichael Halcrow lower_size_after_truncate = 8575f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8585f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8595f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8605f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8615f3ef64fSTyler Hicks } else 8625f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 863237fead6SMichael Halcrow } 864237fead6SMichael Halcrow out: 865237fead6SMichael Halcrow return rc; 866237fead6SMichael Halcrow } 867237fead6SMichael Halcrow 8685f3ef64fSTyler Hicks /** 8695f3ef64fSTyler Hicks * ecryptfs_truncate 8705f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8715f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8725f3ef64fSTyler Hicks * 8735f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8745f3ef64fSTyler Hicks * its corresponding lower inode. 8755f3ef64fSTyler Hicks * 8765f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8775f3ef64fSTyler Hicks */ 8785f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8795f3ef64fSTyler Hicks { 8805f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8815f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8825f3ef64fSTyler Hicks int rc; 8835f3ef64fSTyler Hicks 8845f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8855f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8865f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8875f3ef64fSTyler Hicks 8885f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 8895f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 8905f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 8915f3ef64fSTyler Hicks } 8925f3ef64fSTyler Hicks return rc; 8935f3ef64fSTyler Hicks } 8945f3ef64fSTyler Hicks 895237fead6SMichael Halcrow static int 896b74c79e9SNick Piggin ecryptfs_permission(struct inode *inode, int mask, unsigned int flags) 897237fead6SMichael Halcrow { 898b74c79e9SNick Piggin if (flags & IPERM_FLAG_RCU) 899b74c79e9SNick Piggin return -ECHILD; 900f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 901237fead6SMichael Halcrow } 902237fead6SMichael Halcrow 903237fead6SMichael Halcrow /** 904237fead6SMichael Halcrow * ecryptfs_setattr 905237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 906237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 907237fead6SMichael Halcrow * 908237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 909237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 910237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 911237fead6SMichael Halcrow * 912237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 913237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 914237fead6SMichael Halcrow */ 915237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 916237fead6SMichael Halcrow { 917237fead6SMichael Halcrow int rc = 0; 918237fead6SMichael Halcrow struct dentry *lower_dentry; 9195f3ef64fSTyler Hicks struct iattr lower_ia; 920237fead6SMichael Halcrow struct inode *inode; 921237fead6SMichael Halcrow struct inode *lower_inode; 922237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 923237fead6SMichael Halcrow 924237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 925e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 926e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 927237fead6SMichael Halcrow inode = dentry->d_inode; 928237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 929e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 930e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 931e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 932e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 93364ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 93464ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 93564ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 936e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 937e10f281bSMichael Halcrow 938e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 939e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 940d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 9415dda6992SMichael Halcrow if (rc) { 942e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 943e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 944e10f281bSMichael Halcrow rc = -EIO; 94525bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 946e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 94725bd8174SMichael Halcrow "or the key could not be retrieved. " 94825bd8174SMichael Halcrow "Plaintext passthrough mode is not " 949e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 950e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 951e10f281bSMichael Halcrow goto out; 952e10f281bSMichael Halcrow } 953e10f281bSMichael Halcrow rc = 0; 954e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 955e10f281bSMichael Halcrow } 956e10f281bSMichael Halcrow } 957e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 9585f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9595f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9605f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 961237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9625f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 963237fead6SMichael Halcrow if (rc < 0) 964237fead6SMichael Halcrow goto out; 965237fead6SMichael Halcrow } 9661ac564ecSJeff Layton 9671ac564ecSJeff Layton /* 9681ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9691ac564ecSJeff Layton * to interpret this in its own way. 9701ac564ecSJeff Layton */ 9715f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9725f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9731ac564ecSJeff Layton 9749c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 9755f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9769c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 977237fead6SMichael Halcrow out: 9789afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 979237fead6SMichael Halcrow return rc; 980237fead6SMichael Halcrow } 981237fead6SMichael Halcrow 9823a60a168STyler Hicks int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 9833a60a168STyler Hicks struct kstat *stat) 9843a60a168STyler Hicks { 9853a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9863a60a168STyler Hicks int rc = 0; 9873a60a168STyler Hicks 9883a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9893a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 9903a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 9913a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 9923a60a168STyler Hicks char *target; 9933a60a168STyler Hicks size_t targetsiz; 9943a60a168STyler Hicks 9953a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 9963a60a168STyler Hicks if (!rc) { 9973a60a168STyler Hicks kfree(target); 9983a60a168STyler Hicks stat->size = targetsiz; 9993a60a168STyler Hicks } 10003a60a168STyler Hicks } 10013a60a168STyler Hicks return rc; 10023a60a168STyler Hicks } 10033a60a168STyler Hicks 1004f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1005f8f484d1STyler Hicks struct kstat *stat) 1006f8f484d1STyler Hicks { 1007f8f484d1STyler Hicks struct kstat lower_stat; 1008f8f484d1STyler Hicks int rc; 1009f8f484d1STyler Hicks 1010f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 1011f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 1012f8f484d1STyler Hicks if (!rc) { 1013f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1014f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1015f8f484d1STyler Hicks } 1016f8f484d1STyler Hicks return rc; 1017f8f484d1STyler Hicks } 1018f8f484d1STyler Hicks 1019dd2a3b7aSMichael Halcrow int 1020237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1021237fead6SMichael Halcrow size_t size, int flags) 1022237fead6SMichael Halcrow { 1023237fead6SMichael Halcrow int rc = 0; 1024237fead6SMichael Halcrow struct dentry *lower_dentry; 1025237fead6SMichael Halcrow 1026237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1027237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1028cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1029237fead6SMichael Halcrow goto out; 1030237fead6SMichael Halcrow } 103148b512e6SRoberto Sassu 103248b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 1033237fead6SMichael Halcrow out: 1034237fead6SMichael Halcrow return rc; 1035237fead6SMichael Halcrow } 1036237fead6SMichael Halcrow 1037dd2a3b7aSMichael Halcrow ssize_t 1038d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1039d7cdc5feSMichael Halcrow void *value, size_t size) 1040d7cdc5feSMichael Halcrow { 1041d7cdc5feSMichael Halcrow int rc = 0; 1042d7cdc5feSMichael Halcrow 1043d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1044cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1045d7cdc5feSMichael Halcrow goto out; 1046d7cdc5feSMichael Halcrow } 1047d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1048d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1049d7cdc5feSMichael Halcrow size); 1050d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1051d7cdc5feSMichael Halcrow out: 1052d7cdc5feSMichael Halcrow return rc; 1053d7cdc5feSMichael Halcrow } 1054d7cdc5feSMichael Halcrow 10557896b631SAdrian Bunk static ssize_t 1056237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1057237fead6SMichael Halcrow size_t size) 1058237fead6SMichael Halcrow { 10592ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 10602ed92554SMichael Halcrow value, size); 1061237fead6SMichael Halcrow } 1062237fead6SMichael Halcrow 1063237fead6SMichael Halcrow static ssize_t 1064237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1065237fead6SMichael Halcrow { 1066237fead6SMichael Halcrow int rc = 0; 1067237fead6SMichael Halcrow struct dentry *lower_dentry; 1068237fead6SMichael Halcrow 1069237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1070237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1071cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1072237fead6SMichael Halcrow goto out; 1073237fead6SMichael Halcrow } 1074237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1075237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1076237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1077237fead6SMichael Halcrow out: 1078237fead6SMichael Halcrow return rc; 1079237fead6SMichael Halcrow } 1080237fead6SMichael Halcrow 1081237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1082237fead6SMichael Halcrow { 1083237fead6SMichael Halcrow int rc = 0; 1084237fead6SMichael Halcrow struct dentry *lower_dentry; 1085237fead6SMichael Halcrow 1086237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1087237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1088cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1089237fead6SMichael Halcrow goto out; 1090237fead6SMichael Halcrow } 1091237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1092237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1093237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1094237fead6SMichael Halcrow out: 1095237fead6SMichael Halcrow return rc; 1096237fead6SMichael Halcrow } 1097237fead6SMichael Halcrow 1098237fead6SMichael Halcrow int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) 1099237fead6SMichael Halcrow { 1100237fead6SMichael Halcrow if ((ecryptfs_inode_to_lower(inode) 1101237fead6SMichael Halcrow == (struct inode *)candidate_lower_inode)) 1102237fead6SMichael Halcrow return 1; 1103237fead6SMichael Halcrow else 1104237fead6SMichael Halcrow return 0; 1105237fead6SMichael Halcrow } 1106237fead6SMichael Halcrow 1107237fead6SMichael Halcrow int ecryptfs_inode_set(struct inode *inode, void *lower_inode) 1108237fead6SMichael Halcrow { 1109237fead6SMichael Halcrow ecryptfs_init_inode(inode, (struct inode *)lower_inode); 1110237fead6SMichael Halcrow return 0; 1111237fead6SMichael Halcrow } 1112237fead6SMichael Halcrow 1113754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1114237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1115237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1116237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1117237fead6SMichael Halcrow .permission = ecryptfs_permission, 1118237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11193a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1120237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1121237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1122237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1123237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1124237fead6SMichael Halcrow }; 1125237fead6SMichael Halcrow 1126754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1127237fead6SMichael Halcrow .create = ecryptfs_create, 1128237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1129237fead6SMichael Halcrow .link = ecryptfs_link, 1130237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1131237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1132237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1133237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1134237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1135237fead6SMichael Halcrow .rename = ecryptfs_rename, 1136237fead6SMichael Halcrow .permission = ecryptfs_permission, 1137237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1138237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1139237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1140237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1141237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1142237fead6SMichael Halcrow }; 1143237fead6SMichael Halcrow 1144754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1145237fead6SMichael Halcrow .permission = ecryptfs_permission, 1146237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1147f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1148237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1149237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1150237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1151237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1152237fead6SMichael Halcrow }; 1153