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 if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { 189391b52f9SMichael Halcrow rc = ecryptfs_init_persistent_file(ecryptfs_dentry); 190391b52f9SMichael Halcrow if (rc) { 191391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 192391b52f9SMichael Halcrow "the persistent file for the dentry with name " 193391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 194391b52f9SMichael Halcrow ecryptfs_dentry->d_name.name, rc); 195391b52f9SMichael Halcrow goto out; 196391b52f9SMichael Halcrow } 197391b52f9SMichael Halcrow } 198d7cdc5feSMichael Halcrow rc = ecryptfs_write_metadata(ecryptfs_dentry); 199237fead6SMichael Halcrow if (rc) { 200d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 201d7cdc5feSMichael Halcrow goto out; 202237fead6SMichael Halcrow } 203d7cdc5feSMichael Halcrow rc = grow_file(ecryptfs_dentry); 2045dda6992SMichael Halcrow if (rc) 205d7cdc5feSMichael Halcrow printk(KERN_ERR "Error growing file; rc = [%d]\n", rc); 206237fead6SMichael Halcrow out: 207237fead6SMichael Halcrow return rc; 208237fead6SMichael Halcrow } 209237fead6SMichael Halcrow 210237fead6SMichael Halcrow /** 211237fead6SMichael Halcrow * ecryptfs_create 212237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 213237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 214237fead6SMichael Halcrow * @mode: The mode of the new file. 215237fead6SMichael Halcrow * @nd: nameidata 216237fead6SMichael Halcrow * 217237fead6SMichael Halcrow * Creates a new file. 218237fead6SMichael Halcrow * 219237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 220237fead6SMichael Halcrow */ 221237fead6SMichael Halcrow static int 222237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 223237fead6SMichael Halcrow int mode, struct nameidata *nd) 224237fead6SMichael Halcrow { 225237fead6SMichael Halcrow int rc; 226237fead6SMichael Halcrow 227addd65adSMichael Halcrow /* ecryptfs_do_create() calls ecryptfs_interpose() */ 228237fead6SMichael Halcrow rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); 229237fead6SMichael Halcrow if (unlikely(rc)) { 230237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 231237fead6SMichael Halcrow "lower filesystem\n"); 232237fead6SMichael Halcrow goto out; 233237fead6SMichael Halcrow } 234237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 235237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 236237fead6SMichael Halcrow rc = ecryptfs_initialize_file(ecryptfs_dentry); 237237fead6SMichael Halcrow out: 238237fead6SMichael Halcrow return rc; 239237fead6SMichael Halcrow } 240237fead6SMichael Halcrow 241237fead6SMichael Halcrow /** 242addd65adSMichael Halcrow * ecryptfs_lookup_and_interpose_lower - Perform a lookup 243237fead6SMichael Halcrow */ 244addd65adSMichael Halcrow int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, 245addd65adSMichael Halcrow struct dentry *lower_dentry, 246addd65adSMichael Halcrow struct inode *ecryptfs_dir_inode, 247addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 248237fead6SMichael Halcrow { 249237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 250237fead6SMichael Halcrow struct vfsmount *lower_mnt; 251addd65adSMichael Halcrow struct inode *lower_inode; 252e77a56ddSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 2532aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 254237fead6SMichael Halcrow char *page_virt = NULL; 255237fead6SMichael Halcrow u64 file_size; 256addd65adSMichael Halcrow int rc = 0; 257237fead6SMichael Halcrow 258addd65adSMichael Halcrow lower_dir_dentry = lower_dentry->d_parent; 259addd65adSMichael Halcrow lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( 260addd65adSMichael Halcrow ecryptfs_dentry->d_parent)); 261237fead6SMichael Halcrow lower_inode = lower_dentry->d_inode; 262addd65adSMichael Halcrow fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); 263237fead6SMichael Halcrow BUG_ON(!atomic_read(&lower_dentry->d_count)); 264addd65adSMichael Halcrow ecryptfs_set_dentry_private(ecryptfs_dentry, 265237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_dentry_info_cache, 266e94b1766SChristoph Lameter GFP_KERNEL)); 267addd65adSMichael Halcrow if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { 268237fead6SMichael Halcrow rc = -ENOMEM; 269addd65adSMichael Halcrow printk(KERN_ERR "%s: Out of memory whilst attempting " 270addd65adSMichael Halcrow "to allocate ecryptfs_dentry_info struct\n", 271addd65adSMichael Halcrow __func__); 27231f73beeSLino Sanfilippo goto out_put; 273237fead6SMichael Halcrow } 274addd65adSMichael Halcrow ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); 275addd65adSMichael Halcrow ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); 276237fead6SMichael Halcrow if (!lower_dentry->d_inode) { 277237fead6SMichael Halcrow /* We want to add because we couldn't find in lower */ 278addd65adSMichael Halcrow d_add(ecryptfs_dentry, NULL); 279237fead6SMichael Halcrow goto out; 280237fead6SMichael Halcrow } 281addd65adSMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 2823469b573SErez Zadok ecryptfs_dir_inode->i_sb, 2833469b573SErez Zadok ECRYPTFS_INTERPOSE_FLAG_D_ADD); 284237fead6SMichael Halcrow if (rc) { 285addd65adSMichael Halcrow printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", 286addd65adSMichael Halcrow __func__, rc); 287391b52f9SMichael Halcrow goto out; 288237fead6SMichael Halcrow } 289addd65adSMichael Halcrow if (S_ISDIR(lower_inode->i_mode)) 290237fead6SMichael Halcrow goto out; 291addd65adSMichael Halcrow if (S_ISLNK(lower_inode->i_mode)) 292237fead6SMichael Halcrow goto out; 293addd65adSMichael Halcrow if (special_file(lower_inode->i_mode)) 294202a21d6SRyusuke Konishi goto out; 295addd65adSMichael Halcrow if (!ecryptfs_nd) 296237fead6SMichael Halcrow goto out; 297237fead6SMichael Halcrow /* Released in this function */ 298addd65adSMichael Halcrow page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); 299237fead6SMichael Halcrow if (!page_virt) { 300addd65adSMichael Halcrow printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", 301addd65adSMichael Halcrow __func__); 302237fead6SMichael Halcrow rc = -ENOMEM; 303391b52f9SMichael Halcrow goto out; 304237fead6SMichael Halcrow } 305addd65adSMichael Halcrow if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { 306addd65adSMichael Halcrow rc = ecryptfs_init_persistent_file(ecryptfs_dentry); 307391b52f9SMichael Halcrow if (rc) { 308391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 309391b52f9SMichael Halcrow "the persistent file for the dentry with name " 310391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 311addd65adSMichael Halcrow ecryptfs_dentry->d_name.name, rc); 312addd65adSMichael Halcrow goto out_free_kmem; 313391b52f9SMichael Halcrow } 314391b52f9SMichael Halcrow } 3152aac0cf8STyler Hicks crypt_stat = &ecryptfs_inode_to_private( 3162aac0cf8STyler Hicks ecryptfs_dentry->d_inode)->crypt_stat; 3172aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3182aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3192aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 320d7cdc5feSMichael Halcrow rc = ecryptfs_read_and_validate_header_region(page_virt, 321addd65adSMichael Halcrow ecryptfs_dentry->d_inode); 322237fead6SMichael Halcrow if (rc) { 3231984c23fSTyler Hicks memset(page_virt, 0, PAGE_CACHE_SIZE); 324addd65adSMichael Halcrow rc = ecryptfs_read_and_validate_xattr_region(page_virt, 325addd65adSMichael Halcrow ecryptfs_dentry); 326dd2a3b7aSMichael Halcrow if (rc) { 327237fead6SMichael Halcrow rc = 0; 328addd65adSMichael Halcrow goto out_free_kmem; 329237fead6SMichael Halcrow } 330dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 331dd2a3b7aSMichael Halcrow } 332e77a56ddSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 333addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 334e77a56ddSMichael Halcrow if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { 335e77a56ddSMichael Halcrow if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) 336fa3ef1cbSTyler Hicks file_size = (crypt_stat->metadata_size 337e77a56ddSMichael Halcrow + i_size_read(lower_dentry->d_inode)); 338e77a56ddSMichael Halcrow else 339e77a56ddSMichael Halcrow file_size = i_size_read(lower_dentry->d_inode); 340e77a56ddSMichael Halcrow } else { 3410a688ad7SHarvey Harrison file_size = get_unaligned_be64(page_virt); 342e77a56ddSMichael Halcrow } 343addd65adSMichael Halcrow i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size); 344addd65adSMichael Halcrow out_free_kmem: 345237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 346237fead6SMichael Halcrow goto out; 34731f73beeSLino Sanfilippo out_put: 348237fead6SMichael Halcrow dput(lower_dentry); 34931f73beeSLino Sanfilippo mntput(lower_mnt); 350addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 351237fead6SMichael Halcrow out: 352addd65adSMichael Halcrow return rc; 353addd65adSMichael Halcrow } 354addd65adSMichael Halcrow 355addd65adSMichael Halcrow /** 35621edad32SLino Sanfilippo * ecryptfs_new_lower_dentry 35793c3fe40STyler Hicks * @name: The name of the new dentry. 35821edad32SLino Sanfilippo * @lower_dir_dentry: Parent directory of the new dentry. 35921edad32SLino Sanfilippo * @nd: nameidata from last lookup. 36021edad32SLino Sanfilippo * 36121edad32SLino Sanfilippo * Create a new dentry or get it from lower parent dir. 36221edad32SLino Sanfilippo */ 36321edad32SLino Sanfilippo static struct dentry * 36421edad32SLino Sanfilippo ecryptfs_new_lower_dentry(struct qstr *name, struct dentry *lower_dir_dentry, 36521edad32SLino Sanfilippo struct nameidata *nd) 36621edad32SLino Sanfilippo { 36721edad32SLino Sanfilippo struct dentry *new_dentry; 36821edad32SLino Sanfilippo struct dentry *tmp; 36921edad32SLino Sanfilippo struct inode *lower_dir_inode; 37021edad32SLino Sanfilippo 37121edad32SLino Sanfilippo lower_dir_inode = lower_dir_dentry->d_inode; 37221edad32SLino Sanfilippo 37321edad32SLino Sanfilippo tmp = d_alloc(lower_dir_dentry, name); 37421edad32SLino Sanfilippo if (!tmp) 37521edad32SLino Sanfilippo return ERR_PTR(-ENOMEM); 37621edad32SLino Sanfilippo 37721edad32SLino Sanfilippo mutex_lock(&lower_dir_inode->i_mutex); 37821edad32SLino Sanfilippo new_dentry = lower_dir_inode->i_op->lookup(lower_dir_inode, tmp, nd); 37921edad32SLino Sanfilippo mutex_unlock(&lower_dir_inode->i_mutex); 38021edad32SLino Sanfilippo 38121edad32SLino Sanfilippo if (!new_dentry) 38221edad32SLino Sanfilippo new_dentry = tmp; 38321edad32SLino Sanfilippo else 38421edad32SLino Sanfilippo dput(tmp); 38521edad32SLino Sanfilippo 38621edad32SLino Sanfilippo return new_dentry; 38721edad32SLino Sanfilippo } 38821edad32SLino Sanfilippo 38921edad32SLino Sanfilippo 39021edad32SLino Sanfilippo /** 39121edad32SLino Sanfilippo * ecryptfs_lookup_one_lower 39221edad32SLino Sanfilippo * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 39321edad32SLino Sanfilippo * @lower_dir_dentry: lower parent directory 39493c3fe40STyler Hicks * @name: lower file name 39521edad32SLino Sanfilippo * 39621edad32SLino Sanfilippo * Get the lower dentry from vfs. If lower dentry does not exist yet, 39721edad32SLino Sanfilippo * create it. 39821edad32SLino Sanfilippo */ 39921edad32SLino Sanfilippo static struct dentry * 40021edad32SLino Sanfilippo ecryptfs_lookup_one_lower(struct dentry *ecryptfs_dentry, 40193c3fe40STyler Hicks struct dentry *lower_dir_dentry, struct qstr *name) 40221edad32SLino Sanfilippo { 40321edad32SLino Sanfilippo struct nameidata nd; 40421edad32SLino Sanfilippo struct vfsmount *lower_mnt; 40521edad32SLino Sanfilippo int err; 40621edad32SLino Sanfilippo 40721edad32SLino Sanfilippo lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( 40821edad32SLino Sanfilippo ecryptfs_dentry->d_parent)); 40921edad32SLino Sanfilippo err = vfs_path_lookup(lower_dir_dentry, lower_mnt, name->name , 0, &nd); 41021edad32SLino Sanfilippo mntput(lower_mnt); 41121edad32SLino Sanfilippo 41221edad32SLino Sanfilippo if (!err) { 41321edad32SLino Sanfilippo /* we dont need the mount */ 41421edad32SLino Sanfilippo mntput(nd.path.mnt); 41521edad32SLino Sanfilippo return nd.path.dentry; 41621edad32SLino Sanfilippo } 41721edad32SLino Sanfilippo if (err != -ENOENT) 41821edad32SLino Sanfilippo return ERR_PTR(err); 41921edad32SLino Sanfilippo 42021edad32SLino Sanfilippo /* create a new lower dentry */ 42121edad32SLino Sanfilippo return ecryptfs_new_lower_dentry(name, lower_dir_dentry, &nd); 42221edad32SLino Sanfilippo } 42321edad32SLino Sanfilippo 42421edad32SLino Sanfilippo /** 425addd65adSMichael Halcrow * ecryptfs_lookup 426addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 427addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 428addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 429addd65adSMichael Halcrow * 430addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 431addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 432addd65adSMichael Halcrow */ 433addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 434addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 435addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 436addd65adSMichael Halcrow { 437addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 438a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 439addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 440addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 44193c3fe40STyler Hicks struct qstr lower_name; 442addd65adSMichael Halcrow int rc = 0; 443addd65adSMichael Halcrow 444addd65adSMichael Halcrow ecryptfs_dentry->d_op = &ecryptfs_dops; 445addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 446addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 447addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 448addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 449addd65adSMichael Halcrow goto out_d_drop; 450addd65adSMichael Halcrow } 451addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 45293c3fe40STyler Hicks lower_name.name = ecryptfs_dentry->d_name.name; 45393c3fe40STyler Hicks lower_name.len = ecryptfs_dentry->d_name.len; 45493c3fe40STyler Hicks lower_name.hash = ecryptfs_dentry->d_name.hash; 45593c3fe40STyler Hicks if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) { 45693c3fe40STyler Hicks rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry, 45793c3fe40STyler Hicks &lower_name); 45893c3fe40STyler Hicks if (rc < 0) 45993c3fe40STyler Hicks goto out_d_drop; 46093c3fe40STyler Hicks } 46121edad32SLino Sanfilippo lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry, 46293c3fe40STyler Hicks lower_dir_dentry, &lower_name); 463addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 464addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 46521edad32SLino Sanfilippo ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned " 4669f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 4679f37622fSTyler Hicks encrypted_and_encoded_name); 468addd65adSMichael Halcrow goto out_d_drop; 469addd65adSMichael Halcrow } 470addd65adSMichael Halcrow if (lower_dentry->d_inode) 471addd65adSMichael Halcrow goto lookup_and_interpose; 472addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 473addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 4742aac0cf8STyler Hicks if (!(mount_crypt_stat 4752aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 476addd65adSMichael Halcrow goto lookup_and_interpose; 477addd65adSMichael Halcrow dput(lower_dentry); 478addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 479addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 4802aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 481addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 482addd65adSMichael Halcrow if (rc) { 483addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 484addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 485addd65adSMichael Halcrow goto out_d_drop; 486addd65adSMichael Halcrow } 48793c3fe40STyler Hicks lower_name.name = encrypted_and_encoded_name; 48893c3fe40STyler Hicks lower_name.len = encrypted_and_encoded_name_size; 48993c3fe40STyler Hicks lower_name.hash = full_name_hash(lower_name.name, lower_name.len); 49093c3fe40STyler Hicks if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) { 49193c3fe40STyler Hicks rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry, 49293c3fe40STyler Hicks &lower_name); 49393c3fe40STyler Hicks if (rc < 0) 49493c3fe40STyler Hicks goto out_d_drop; 49593c3fe40STyler Hicks } 49621edad32SLino Sanfilippo lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry, 49793c3fe40STyler Hicks lower_dir_dentry, &lower_name); 498addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 499addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 50021edad32SLino Sanfilippo ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned " 5019f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 502addd65adSMichael Halcrow encrypted_and_encoded_name); 503addd65adSMichael Halcrow goto out_d_drop; 504addd65adSMichael Halcrow } 505addd65adSMichael Halcrow lookup_and_interpose: 506addd65adSMichael Halcrow rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, 5072aac0cf8STyler Hicks ecryptfs_dir_inode, 508addd65adSMichael Halcrow ecryptfs_nd); 509addd65adSMichael Halcrow goto out; 510addd65adSMichael Halcrow out_d_drop: 511addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 512addd65adSMichael Halcrow out: 513addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 514237fead6SMichael Halcrow return ERR_PTR(rc); 515237fead6SMichael Halcrow } 516237fead6SMichael Halcrow 517237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 518237fead6SMichael Halcrow struct dentry *new_dentry) 519237fead6SMichael Halcrow { 520237fead6SMichael Halcrow struct dentry *lower_old_dentry; 521237fead6SMichael Halcrow struct dentry *lower_new_dentry; 522237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 523237fead6SMichael Halcrow u64 file_size_save; 524237fead6SMichael Halcrow int rc; 525237fead6SMichael Halcrow 526237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 527237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 528237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 529237fead6SMichael Halcrow dget(lower_old_dentry); 530237fead6SMichael Halcrow dget(lower_new_dentry); 531237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 532237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 533237fead6SMichael Halcrow lower_new_dentry); 534237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 535237fead6SMichael Halcrow goto out_lock; 536237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); 537237fead6SMichael Halcrow if (rc) 538237fead6SMichael Halcrow goto out_lock; 5393a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5403a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 541237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 542237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 543237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 544237fead6SMichael Halcrow out_lock: 545237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 546237fead6SMichael Halcrow dput(lower_new_dentry); 547237fead6SMichael Halcrow dput(lower_old_dentry); 548237fead6SMichael Halcrow return rc; 549237fead6SMichael Halcrow } 550237fead6SMichael Halcrow 551237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 552237fead6SMichael Halcrow { 553237fead6SMichael Halcrow int rc = 0; 554237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 555237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 5568dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 557237fead6SMichael Halcrow 5589c2d2056STyler Hicks dget(lower_dentry); 5598dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 560237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 561237fead6SMichael Halcrow if (rc) { 562ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 563237fead6SMichael Halcrow goto out_unlock; 564237fead6SMichael Halcrow } 5650cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 566237fead6SMichael Halcrow dentry->d_inode->i_nlink = 567237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 568237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 569caeeeecfSMichael Halcrow d_drop(dentry); 570237fead6SMichael Halcrow out_unlock: 5718dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 5729c2d2056STyler Hicks dput(lower_dentry); 573237fead6SMichael Halcrow return rc; 574237fead6SMichael Halcrow } 575237fead6SMichael Halcrow 576237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 577237fead6SMichael Halcrow const char *symname) 578237fead6SMichael Halcrow { 579237fead6SMichael Halcrow int rc; 580237fead6SMichael Halcrow struct dentry *lower_dentry; 581237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 582237fead6SMichael Halcrow char *encoded_symname; 583addd65adSMichael Halcrow size_t encoded_symlen; 584addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 585237fead6SMichael Halcrow 586237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 587237fead6SMichael Halcrow dget(lower_dentry); 588237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 589addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 590addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 591addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 592addd65adSMichael Halcrow &encoded_symlen, 593addd65adSMichael Halcrow NULL, 594addd65adSMichael Halcrow mount_crypt_stat, symname, 595addd65adSMichael Halcrow strlen(symname)); 596addd65adSMichael Halcrow if (rc) 597237fead6SMichael Halcrow goto out_lock; 598237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 599db2e747bSMiklos Szeredi encoded_symname); 600237fead6SMichael Halcrow kfree(encoded_symname); 601237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 602237fead6SMichael Halcrow goto out_lock; 603237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 604237fead6SMichael Halcrow if (rc) 605237fead6SMichael Halcrow goto out_lock; 6060cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 6070cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 608237fead6SMichael Halcrow out_lock: 609237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 610237fead6SMichael Halcrow dput(lower_dentry); 611237fead6SMichael Halcrow if (!dentry->d_inode) 612237fead6SMichael Halcrow d_drop(dentry); 613237fead6SMichael Halcrow return rc; 614237fead6SMichael Halcrow } 615237fead6SMichael Halcrow 616237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 617237fead6SMichael Halcrow { 618237fead6SMichael Halcrow int rc; 619237fead6SMichael Halcrow struct dentry *lower_dentry; 620237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 621237fead6SMichael Halcrow 622237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 623237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 624237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 625237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 626237fead6SMichael Halcrow goto out; 627237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 628237fead6SMichael Halcrow if (rc) 629237fead6SMichael Halcrow goto out; 6300cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 6310cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 632237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 633237fead6SMichael Halcrow out: 634237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 635237fead6SMichael Halcrow if (!dentry->d_inode) 636237fead6SMichael Halcrow d_drop(dentry); 637237fead6SMichael Halcrow return rc; 638237fead6SMichael Halcrow } 639237fead6SMichael Halcrow 640237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 641237fead6SMichael Halcrow { 642237fead6SMichael Halcrow struct dentry *lower_dentry; 643237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 64445ec4abaSMichael Halcrow int rc; 645237fead6SMichael Halcrow 646237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 64745ec4abaSMichael Halcrow dget(dentry); 648237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 64945ec4abaSMichael Halcrow dget(lower_dentry); 650237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 65145ec4abaSMichael Halcrow dput(lower_dentry); 65245ec4abaSMichael Halcrow if (!rc) 65345ec4abaSMichael Halcrow d_delete(lower_dentry); 6540cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 655237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 656237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 657237fead6SMichael Halcrow if (!rc) 658237fead6SMichael Halcrow d_drop(dentry); 65945ec4abaSMichael Halcrow dput(dentry); 660237fead6SMichael Halcrow return rc; 661237fead6SMichael Halcrow } 662237fead6SMichael Halcrow 663237fead6SMichael Halcrow static int 664237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 665237fead6SMichael Halcrow { 666237fead6SMichael Halcrow int rc; 667237fead6SMichael Halcrow struct dentry *lower_dentry; 668237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 669237fead6SMichael Halcrow 670237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 671237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 672237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 673237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 674237fead6SMichael Halcrow goto out; 675391b52f9SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 676237fead6SMichael Halcrow if (rc) 677237fead6SMichael Halcrow goto out; 6780cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 6790cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 680237fead6SMichael Halcrow out: 681237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 682237fead6SMichael Halcrow if (!dentry->d_inode) 683237fead6SMichael Halcrow d_drop(dentry); 684237fead6SMichael Halcrow return rc; 685237fead6SMichael Halcrow } 686237fead6SMichael Halcrow 687237fead6SMichael Halcrow static int 688237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 689237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 690237fead6SMichael Halcrow { 691237fead6SMichael Halcrow int rc; 692237fead6SMichael Halcrow struct dentry *lower_old_dentry; 693237fead6SMichael Halcrow struct dentry *lower_new_dentry; 694237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 695237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6960d132f73SErez Zadok struct dentry *trap = NULL; 697237fead6SMichael Halcrow 698237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 699237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 700237fead6SMichael Halcrow dget(lower_old_dentry); 701237fead6SMichael Halcrow dget(lower_new_dentry); 702237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 703237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 7040d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 7050d132f73SErez Zadok /* source should not be ancestor of target */ 7060d132f73SErez Zadok if (trap == lower_old_dentry) { 7070d132f73SErez Zadok rc = -EINVAL; 7080d132f73SErez Zadok goto out_lock; 7090d132f73SErez Zadok } 7100d132f73SErez Zadok /* target should not be ancestor of source */ 7110d132f73SErez Zadok if (trap == lower_new_dentry) { 7120d132f73SErez Zadok rc = -ENOTEMPTY; 7130d132f73SErez Zadok goto out_lock; 7140d132f73SErez Zadok } 715237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 716237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 717237fead6SMichael Halcrow if (rc) 718237fead6SMichael Halcrow goto out_lock; 7199afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 720237fead6SMichael Halcrow if (new_dir != old_dir) 7219afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 722237fead6SMichael Halcrow out_lock: 723237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 724a9083081SMichael Halcrow dput(lower_new_dentry->d_parent); 725a9083081SMichael Halcrow dput(lower_old_dentry->d_parent); 726237fead6SMichael Halcrow dput(lower_new_dentry); 727237fead6SMichael Halcrow dput(lower_old_dentry); 728237fead6SMichael Halcrow return rc; 729237fead6SMichael Halcrow } 730237fead6SMichael Halcrow 7313a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 7323a60a168STyler Hicks size_t *bufsiz) 733237fead6SMichael Halcrow { 7343a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 735237fead6SMichael Halcrow char *lower_buf; 7363a60a168STyler Hicks size_t lower_bufsiz = PATH_MAX; 737addd65adSMichael Halcrow mm_segment_t old_fs; 738addd65adSMichael Halcrow int rc; 739237fead6SMichael Halcrow 7403a6b42caSTyler Hicks lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); 7413a60a168STyler Hicks if (!lower_buf) { 742237fead6SMichael Halcrow rc = -ENOMEM; 743237fead6SMichael Halcrow goto out; 744237fead6SMichael Halcrow } 745237fead6SMichael Halcrow old_fs = get_fs(); 746237fead6SMichael Halcrow set_fs(get_ds()); 747237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 748237fead6SMichael Halcrow (char __user *)lower_buf, 7493a6b42caSTyler Hicks lower_bufsiz); 750237fead6SMichael Halcrow set_fs(old_fs); 7513a60a168STyler Hicks if (rc < 0) 7523a60a168STyler Hicks goto out; 7533a60a168STyler Hicks lower_bufsiz = rc; 7543a60a168STyler Hicks rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, 7553a60a168STyler Hicks lower_buf, lower_bufsiz); 7563a60a168STyler Hicks out: 757237fead6SMichael Halcrow kfree(lower_buf); 7583a60a168STyler Hicks return rc; 7593a60a168STyler Hicks } 7603a60a168STyler Hicks 7613a60a168STyler Hicks static int 7623a60a168STyler Hicks ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 7633a60a168STyler Hicks { 7643a60a168STyler Hicks char *kbuf; 7653a60a168STyler Hicks size_t kbufsiz, copied; 7663a60a168STyler Hicks int rc; 7673a60a168STyler Hicks 7683a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); 7693a60a168STyler Hicks if (rc) 7703a60a168STyler Hicks goto out; 7713a60a168STyler Hicks copied = min_t(size_t, bufsiz, kbufsiz); 7723a60a168STyler Hicks rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; 7733a60a168STyler Hicks kfree(kbuf); 7743a60a168STyler Hicks fsstack_copy_attr_atime(dentry->d_inode, 7753a60a168STyler Hicks ecryptfs_dentry_to_lower(dentry)->d_inode); 776237fead6SMichael Halcrow out: 777237fead6SMichael Halcrow return rc; 778237fead6SMichael Halcrow } 779237fead6SMichael Halcrow 780237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 781237fead6SMichael Halcrow { 782237fead6SMichael Halcrow char *buf; 783237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 784237fead6SMichael Halcrow mm_segment_t old_fs; 785237fead6SMichael Halcrow 786237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 787237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 788237fead6SMichael Halcrow if (!buf) { 789806892e9SOGAWA Hirofumi buf = ERR_PTR(-ENOMEM); 790237fead6SMichael Halcrow goto out; 791237fead6SMichael Halcrow } 792237fead6SMichael Halcrow old_fs = get_fs(); 793237fead6SMichael Halcrow set_fs(get_ds()); 794237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 795237fead6SMichael Halcrow set_fs(old_fs); 796806892e9SOGAWA Hirofumi if (rc < 0) { 797237fead6SMichael Halcrow kfree(buf); 798806892e9SOGAWA Hirofumi buf = ERR_PTR(rc); 799806892e9SOGAWA Hirofumi } else 800806892e9SOGAWA Hirofumi buf[rc] = '\0'; 801237fead6SMichael Halcrow out: 802806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 803806892e9SOGAWA Hirofumi return NULL; 804237fead6SMichael Halcrow } 805237fead6SMichael Halcrow 806237fead6SMichael Halcrow static void 807237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 808237fead6SMichael Halcrow { 809806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 810806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 811237fead6SMichael Halcrow /* Free the char* */ 812806892e9SOGAWA Hirofumi kfree(buf); 813806892e9SOGAWA Hirofumi } 814237fead6SMichael Halcrow } 815237fead6SMichael Halcrow 816237fead6SMichael Halcrow /** 817237fead6SMichael Halcrow * upper_size_to_lower_size 818237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 819237fead6SMichael Halcrow * @upper_size: Size of the upper file 820237fead6SMichael Halcrow * 821cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 822237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 823237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 824237fead6SMichael Halcrow * 825237fead6SMichael Halcrow * Returns Calculated size of the lower file. 826237fead6SMichael Halcrow */ 827237fead6SMichael Halcrow static loff_t 828237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 829237fead6SMichael Halcrow loff_t upper_size) 830237fead6SMichael Halcrow { 831237fead6SMichael Halcrow loff_t lower_size; 832237fead6SMichael Halcrow 833157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 834237fead6SMichael Halcrow if (upper_size != 0) { 835237fead6SMichael Halcrow loff_t num_extents; 836237fead6SMichael Halcrow 837237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 838237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 839237fead6SMichael Halcrow num_extents++; 840237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 841237fead6SMichael Halcrow } 842237fead6SMichael Halcrow return lower_size; 843237fead6SMichael Halcrow } 844237fead6SMichael Halcrow 845237fead6SMichael Halcrow /** 8465f3ef64fSTyler Hicks * truncate_upper 847237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 8485f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 8495f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 850237fead6SMichael Halcrow * 851237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 852237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 8535f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 8545f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 8555f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 8565f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 8575f3ef64fSTyler Hicks * the truncation of the lower inode. 858237fead6SMichael Halcrow * 859237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 860237fead6SMichael Halcrow */ 8615f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 8625f3ef64fSTyler Hicks struct iattr *lower_ia) 863237fead6SMichael Halcrow { 864237fead6SMichael Halcrow int rc = 0; 865237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 866237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 867237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 868237fead6SMichael Halcrow loff_t lower_size_before_truncate; 869237fead6SMichael Halcrow loff_t lower_size_after_truncate; 870237fead6SMichael Halcrow 8715f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 8725f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 873237fead6SMichael Halcrow goto out; 8745f3ef64fSTyler Hicks } 875237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 876237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 8775f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 8782ed92554SMichael Halcrow char zero[] = { 0x00 }; 879240e2df5SMichael Halcrow 8805f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 8812ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 8822ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 8832ed92554SMichael Halcrow * the intermediate portion of the previous end of the 8842ed92554SMichael Halcrow * file and the new and of the file */ 88548c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 8865f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 8875f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 8885f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 8895f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 8905f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 8912ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 8922ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 8935f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 8942ed92554SMichael Halcrow 8952c27c65eSChristoph Hellwig 8962c27c65eSChristoph Hellwig /* 8972c27c65eSChristoph Hellwig * XXX(truncate) this should really happen at the begginning 8982c27c65eSChristoph Hellwig * of ->setattr. But the code is too messy to that as part 8992c27c65eSChristoph Hellwig * of a larger patch. ecryptfs is also totally missing out 9002c27c65eSChristoph Hellwig * on the inode_change_ok check at the beginning of 9012c27c65eSChristoph Hellwig * ->setattr while would include this. 9022c27c65eSChristoph Hellwig */ 9032c27c65eSChristoph Hellwig rc = inode_newsize_ok(inode, ia->ia_size); 90413a791b4STyler Hicks if (rc) 90548c1e44aSAl Viro goto out; 9062c27c65eSChristoph Hellwig 9072c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 9082c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 9095f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 9105f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 91148c1e44aSAl Viro goto out; 91213a791b4STyler Hicks } 9132ed92554SMichael Halcrow if (num_zeros) { 9142ed92554SMichael Halcrow char *zeros_virt; 9152ed92554SMichael Halcrow 9162ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 9172ed92554SMichael Halcrow if (!zeros_virt) { 9182ed92554SMichael Halcrow rc = -ENOMEM; 91948c1e44aSAl Viro goto out; 920240e2df5SMichael Halcrow } 92148c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 9225f3ef64fSTyler Hicks ia->ia_size, num_zeros); 9232ed92554SMichael Halcrow kfree(zeros_virt); 9245dda6992SMichael Halcrow if (rc) { 925240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 926240e2df5SMichael Halcrow "the remainder of the end page on " 927240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 92848c1e44aSAl Viro goto out; 929240e2df5SMichael Halcrow } 930240e2df5SMichael Halcrow } 9312c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 9320216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 933dd2a3b7aSMichael Halcrow if (rc) { 934dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 935dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 936dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 93748c1e44aSAl Viro goto out; 938dd2a3b7aSMichael Halcrow } 939237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 940237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 941237fead6SMichael Halcrow lower_size_before_truncate = 942237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 943237fead6SMichael Halcrow lower_size_after_truncate = 9445f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 9455f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 9465f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 9475f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 9485f3ef64fSTyler Hicks } else 9495f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 950237fead6SMichael Halcrow } 951237fead6SMichael Halcrow out: 952237fead6SMichael Halcrow return rc; 953237fead6SMichael Halcrow } 954237fead6SMichael Halcrow 9555f3ef64fSTyler Hicks /** 9565f3ef64fSTyler Hicks * ecryptfs_truncate 9575f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 9585f3ef64fSTyler Hicks * @new_length: The length to expand the file to 9595f3ef64fSTyler Hicks * 9605f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 9615f3ef64fSTyler Hicks * its corresponding lower inode. 9625f3ef64fSTyler Hicks * 9635f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 9645f3ef64fSTyler Hicks */ 9655f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 9665f3ef64fSTyler Hicks { 9675f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 9685f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 9695f3ef64fSTyler Hicks int rc; 9705f3ef64fSTyler Hicks 9715f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 9725f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 9735f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 9745f3ef64fSTyler Hicks 9755f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 9765f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9775f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 9785f3ef64fSTyler Hicks } 9795f3ef64fSTyler Hicks return rc; 9805f3ef64fSTyler Hicks } 9815f3ef64fSTyler Hicks 982237fead6SMichael Halcrow static int 983e6305c43SAl Viro ecryptfs_permission(struct inode *inode, int mask) 984237fead6SMichael Halcrow { 985f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 986237fead6SMichael Halcrow } 987237fead6SMichael Halcrow 988237fead6SMichael Halcrow /** 989237fead6SMichael Halcrow * ecryptfs_setattr 990237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 991237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 992237fead6SMichael Halcrow * 993237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 994237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 995237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 996237fead6SMichael Halcrow * 997237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 998237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 999237fead6SMichael Halcrow */ 1000237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 1001237fead6SMichael Halcrow { 1002237fead6SMichael Halcrow int rc = 0; 1003237fead6SMichael Halcrow struct dentry *lower_dentry; 10045f3ef64fSTyler Hicks struct iattr lower_ia; 1005237fead6SMichael Halcrow struct inode *inode; 1006237fead6SMichael Halcrow struct inode *lower_inode; 1007237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 1008237fead6SMichael Halcrow 1009237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 1010e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 1011e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 1012237fead6SMichael Halcrow inode = dentry->d_inode; 1013237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 1014e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1015e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 1016e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 1017e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 101864ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 101964ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 102064ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 1021e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 1022e10f281bSMichael Halcrow 1023e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 1024e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 1025d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 10265dda6992SMichael Halcrow if (rc) { 1027e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 1028e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 1029e10f281bSMichael Halcrow rc = -EIO; 103025bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 1031e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 103225bd8174SMichael Halcrow "or the key could not be retrieved. " 103325bd8174SMichael Halcrow "Plaintext passthrough mode is not " 1034e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 1035e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 1036e10f281bSMichael Halcrow goto out; 1037e10f281bSMichael Halcrow } 1038e10f281bSMichael Halcrow rc = 0; 1039e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 1040e10f281bSMichael Halcrow } 1041e10f281bSMichael Halcrow } 1042e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 10435f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 10445f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 10455f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 1046237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 10475f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 1048237fead6SMichael Halcrow if (rc < 0) 1049237fead6SMichael Halcrow goto out; 1050237fead6SMichael Halcrow } 10511ac564ecSJeff Layton 10521ac564ecSJeff Layton /* 10531ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 10541ac564ecSJeff Layton * to interpret this in its own way. 10551ac564ecSJeff Layton */ 10565f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 10575f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 10581ac564ecSJeff Layton 10599c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 10605f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 10619c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 1062237fead6SMichael Halcrow out: 10639afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 1064237fead6SMichael Halcrow return rc; 1065237fead6SMichael Halcrow } 1066237fead6SMichael Halcrow 10673a60a168STyler Hicks int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 10683a60a168STyler Hicks struct kstat *stat) 10693a60a168STyler Hicks { 10703a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 10713a60a168STyler Hicks int rc = 0; 10723a60a168STyler Hicks 10733a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 10743a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 10753a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 10763a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 10773a60a168STyler Hicks char *target; 10783a60a168STyler Hicks size_t targetsiz; 10793a60a168STyler Hicks 10803a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 10813a60a168STyler Hicks if (!rc) { 10823a60a168STyler Hicks kfree(target); 10833a60a168STyler Hicks stat->size = targetsiz; 10843a60a168STyler Hicks } 10853a60a168STyler Hicks } 10863a60a168STyler Hicks return rc; 10873a60a168STyler Hicks } 10883a60a168STyler Hicks 1089f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1090f8f484d1STyler Hicks struct kstat *stat) 1091f8f484d1STyler Hicks { 1092f8f484d1STyler Hicks struct kstat lower_stat; 1093f8f484d1STyler Hicks int rc; 1094f8f484d1STyler Hicks 1095f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 1096f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 1097f8f484d1STyler Hicks if (!rc) { 1098f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1099f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1100f8f484d1STyler Hicks } 1101f8f484d1STyler Hicks return rc; 1102f8f484d1STyler Hicks } 1103f8f484d1STyler Hicks 1104dd2a3b7aSMichael Halcrow int 1105237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1106237fead6SMichael Halcrow size_t size, int flags) 1107237fead6SMichael Halcrow { 1108237fead6SMichael Halcrow int rc = 0; 1109237fead6SMichael Halcrow struct dentry *lower_dentry; 1110237fead6SMichael Halcrow 1111237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1112237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1113cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1114237fead6SMichael Halcrow goto out; 1115237fead6SMichael Halcrow } 111648b512e6SRoberto Sassu 111748b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 1118237fead6SMichael Halcrow out: 1119237fead6SMichael Halcrow return rc; 1120237fead6SMichael Halcrow } 1121237fead6SMichael Halcrow 1122dd2a3b7aSMichael Halcrow ssize_t 1123d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1124d7cdc5feSMichael Halcrow void *value, size_t size) 1125d7cdc5feSMichael Halcrow { 1126d7cdc5feSMichael Halcrow int rc = 0; 1127d7cdc5feSMichael Halcrow 1128d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1129cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1130d7cdc5feSMichael Halcrow goto out; 1131d7cdc5feSMichael Halcrow } 1132d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1133d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1134d7cdc5feSMichael Halcrow size); 1135d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1136d7cdc5feSMichael Halcrow out: 1137d7cdc5feSMichael Halcrow return rc; 1138d7cdc5feSMichael Halcrow } 1139d7cdc5feSMichael Halcrow 11407896b631SAdrian Bunk static ssize_t 1141237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1142237fead6SMichael Halcrow size_t size) 1143237fead6SMichael Halcrow { 11442ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 11452ed92554SMichael Halcrow value, size); 1146237fead6SMichael Halcrow } 1147237fead6SMichael Halcrow 1148237fead6SMichael Halcrow static ssize_t 1149237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1150237fead6SMichael Halcrow { 1151237fead6SMichael Halcrow int rc = 0; 1152237fead6SMichael Halcrow struct dentry *lower_dentry; 1153237fead6SMichael Halcrow 1154237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1155237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1156cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1157237fead6SMichael Halcrow goto out; 1158237fead6SMichael Halcrow } 1159237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1160237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1161237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1162237fead6SMichael Halcrow out: 1163237fead6SMichael Halcrow return rc; 1164237fead6SMichael Halcrow } 1165237fead6SMichael Halcrow 1166237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1167237fead6SMichael Halcrow { 1168237fead6SMichael Halcrow int rc = 0; 1169237fead6SMichael Halcrow struct dentry *lower_dentry; 1170237fead6SMichael Halcrow 1171237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1172237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1173cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1174237fead6SMichael Halcrow goto out; 1175237fead6SMichael Halcrow } 1176237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1177237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1178237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1179237fead6SMichael Halcrow out: 1180237fead6SMichael Halcrow return rc; 1181237fead6SMichael Halcrow } 1182237fead6SMichael Halcrow 1183237fead6SMichael Halcrow int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) 1184237fead6SMichael Halcrow { 1185237fead6SMichael Halcrow if ((ecryptfs_inode_to_lower(inode) 1186237fead6SMichael Halcrow == (struct inode *)candidate_lower_inode)) 1187237fead6SMichael Halcrow return 1; 1188237fead6SMichael Halcrow else 1189237fead6SMichael Halcrow return 0; 1190237fead6SMichael Halcrow } 1191237fead6SMichael Halcrow 1192237fead6SMichael Halcrow int ecryptfs_inode_set(struct inode *inode, void *lower_inode) 1193237fead6SMichael Halcrow { 1194237fead6SMichael Halcrow ecryptfs_init_inode(inode, (struct inode *)lower_inode); 1195237fead6SMichael Halcrow return 0; 1196237fead6SMichael Halcrow } 1197237fead6SMichael Halcrow 1198754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1199237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1200237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1201237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1202237fead6SMichael Halcrow .permission = ecryptfs_permission, 1203237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 12043a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1205237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1206237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1207237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1208237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1209237fead6SMichael Halcrow }; 1210237fead6SMichael Halcrow 1211754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1212237fead6SMichael Halcrow .create = ecryptfs_create, 1213237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1214237fead6SMichael Halcrow .link = ecryptfs_link, 1215237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1216237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1217237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1218237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1219237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1220237fead6SMichael Halcrow .rename = ecryptfs_rename, 1221237fead6SMichael Halcrow .permission = ecryptfs_permission, 1222237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1223237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1224237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1225237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1226237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1227237fead6SMichael Halcrow }; 1228237fead6SMichael Halcrow 1229754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1230237fead6SMichael Halcrow .permission = ecryptfs_permission, 1231237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1232f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1233237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1234237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1235237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1236237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1237237fead6SMichael Halcrow }; 1238