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 54c4f79073STyler Hicks static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) 55c4f79073STyler Hicks { 56c4f79073STyler Hicks if (ecryptfs_inode_to_lower(inode) == (struct inode *)lower_inode) 57c4f79073STyler Hicks return 1; 58c4f79073STyler Hicks return 0; 59c4f79073STyler Hicks } 60c4f79073STyler Hicks 61c4f79073STyler Hicks static int ecryptfs_inode_set(struct inode *inode, void *lower_inode) 62c4f79073STyler Hicks { 63c4f79073STyler Hicks ecryptfs_set_inode_lower(inode, (struct inode *)lower_inode); 64c4f79073STyler Hicks inode->i_ino = ((struct inode *)lower_inode)->i_ino; 65c4f79073STyler Hicks inode->i_version++; 66c4f79073STyler Hicks inode->i_op = &ecryptfs_main_iops; 67c4f79073STyler Hicks inode->i_fop = &ecryptfs_main_fops; 68c4f79073STyler Hicks inode->i_mapping->a_ops = &ecryptfs_aops; 69c4f79073STyler Hicks return 0; 70c4f79073STyler Hicks } 71c4f79073STyler Hicks 72c4f79073STyler Hicks struct inode *ecryptfs_get_inode(struct inode *lower_inode, 73c4f79073STyler Hicks struct super_block *sb) 74c4f79073STyler Hicks { 75c4f79073STyler Hicks struct inode *inode; 76c4f79073STyler Hicks int rc = 0; 77c4f79073STyler Hicks 78c4f79073STyler Hicks if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) { 79c4f79073STyler Hicks rc = -EXDEV; 80c4f79073STyler Hicks goto out; 81c4f79073STyler Hicks } 82c4f79073STyler Hicks if (!igrab(lower_inode)) { 83c4f79073STyler Hicks rc = -ESTALE; 84c4f79073STyler Hicks goto out; 85c4f79073STyler Hicks } 86c4f79073STyler Hicks inode = iget5_locked(sb, (unsigned long)lower_inode, 87c4f79073STyler Hicks ecryptfs_inode_test, ecryptfs_inode_set, 88c4f79073STyler Hicks lower_inode); 89c4f79073STyler Hicks if (!inode) { 90c4f79073STyler Hicks rc = -EACCES; 91c4f79073STyler Hicks iput(lower_inode); 92c4f79073STyler Hicks goto out; 93c4f79073STyler Hicks } 94c4f79073STyler Hicks if (inode->i_state & I_NEW) 95c4f79073STyler Hicks unlock_new_inode(inode); 96c4f79073STyler Hicks else 97c4f79073STyler Hicks iput(lower_inode); 98c4f79073STyler Hicks if (S_ISLNK(lower_inode->i_mode)) 99c4f79073STyler Hicks inode->i_op = &ecryptfs_symlink_iops; 100c4f79073STyler Hicks else if (S_ISDIR(lower_inode->i_mode)) 101c4f79073STyler Hicks inode->i_op = &ecryptfs_dir_iops; 102c4f79073STyler Hicks if (S_ISDIR(lower_inode->i_mode)) 103c4f79073STyler Hicks inode->i_fop = &ecryptfs_dir_fops; 104c4f79073STyler Hicks if (special_file(lower_inode->i_mode)) 105c4f79073STyler Hicks init_special_inode(inode, lower_inode->i_mode, 106c4f79073STyler Hicks lower_inode->i_rdev); 107c4f79073STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 108c4f79073STyler Hicks /* This size will be overwritten for real files w/ headers and 109c4f79073STyler Hicks * other metadata */ 110c4f79073STyler Hicks fsstack_copy_inode_size(inode, lower_inode); 111c4f79073STyler Hicks return inode; 112c4f79073STyler Hicks out: 113c4f79073STyler Hicks return ERR_PTR(rc); 114c4f79073STyler Hicks } 115c4f79073STyler Hicks 116c4f79073STyler Hicks #define ECRYPTFS_INTERPOSE_FLAG_D_ADD 0x00000001 117c4f79073STyler Hicks /** 118c4f79073STyler Hicks * ecryptfs_interpose 119c4f79073STyler Hicks * @lower_dentry: Existing dentry in the lower filesystem 120c4f79073STyler Hicks * @dentry: ecryptfs' dentry 121c4f79073STyler Hicks * @sb: ecryptfs's super_block 122c4f79073STyler Hicks * @flags: flags to govern behavior of interpose procedure 123c4f79073STyler Hicks * 124c4f79073STyler Hicks * Interposes upper and lower dentries. 125c4f79073STyler Hicks * 126c4f79073STyler Hicks * Returns zero on success; non-zero otherwise 127c4f79073STyler Hicks */ 128c4f79073STyler Hicks static int ecryptfs_interpose(struct dentry *lower_dentry, 129c4f79073STyler Hicks struct dentry *dentry, struct super_block *sb, 130c4f79073STyler Hicks u32 flags) 131c4f79073STyler Hicks { 132c4f79073STyler Hicks struct inode *lower_inode = lower_dentry->d_inode; 133c4f79073STyler Hicks struct inode *inode = ecryptfs_get_inode(lower_inode, sb); 134c4f79073STyler Hicks if (IS_ERR(inode)) 135c4f79073STyler Hicks return PTR_ERR(inode); 136c4f79073STyler Hicks if (flags & ECRYPTFS_INTERPOSE_FLAG_D_ADD) 137c4f79073STyler Hicks d_add(dentry, inode); 138c4f79073STyler Hicks else 139c4f79073STyler Hicks d_instantiate(dentry, inode); 140c4f79073STyler Hicks return 0; 141c4f79073STyler Hicks } 142c4f79073STyler Hicks 143237fead6SMichael Halcrow /** 144237fead6SMichael Halcrow * ecryptfs_create_underlying_file 145237fead6SMichael Halcrow * @lower_dir_inode: inode of the parent in the lower fs of the new file 146f70f582fSQinghuang Feng * @dentry: New file's dentry 147237fead6SMichael Halcrow * @mode: The mode of the new file 148237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 149237fead6SMichael Halcrow * 150237fead6SMichael Halcrow * Creates the file in the lower file system. 151237fead6SMichael Halcrow * 152237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 153237fead6SMichael Halcrow */ 154237fead6SMichael Halcrow static int 155237fead6SMichael Halcrow ecryptfs_create_underlying_file(struct inode *lower_dir_inode, 156237fead6SMichael Halcrow struct dentry *dentry, int mode, 157237fead6SMichael Halcrow struct nameidata *nd) 158237fead6SMichael Halcrow { 159237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 160237fead6SMichael Halcrow struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); 161237fead6SMichael Halcrow struct dentry *dentry_save; 162237fead6SMichael Halcrow struct vfsmount *vfsmount_save; 1632e21b3f1STyler Hicks unsigned int flags_save; 164237fead6SMichael Halcrow int rc; 165237fead6SMichael Halcrow 16670b89021STyler Hicks if (nd) { 1674ac91378SJan Blunck dentry_save = nd->path.dentry; 1684ac91378SJan Blunck vfsmount_save = nd->path.mnt; 1692e21b3f1STyler Hicks flags_save = nd->flags; 1704ac91378SJan Blunck nd->path.dentry = lower_dentry; 1714ac91378SJan Blunck nd->path.mnt = lower_mnt; 1722e21b3f1STyler Hicks nd->flags &= ~LOOKUP_OPEN; 17370b89021STyler Hicks } 174237fead6SMichael Halcrow rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); 17570b89021STyler Hicks if (nd) { 1764ac91378SJan Blunck nd->path.dentry = dentry_save; 1774ac91378SJan Blunck nd->path.mnt = vfsmount_save; 1782e21b3f1STyler Hicks nd->flags = flags_save; 17970b89021STyler Hicks } 180237fead6SMichael Halcrow return rc; 181237fead6SMichael Halcrow } 182237fead6SMichael Halcrow 183237fead6SMichael Halcrow /** 184237fead6SMichael Halcrow * ecryptfs_do_create 185237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 186237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 187237fead6SMichael Halcrow * @mode: The mode of the new file 188237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 189237fead6SMichael Halcrow * 190237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 191237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 192237fead6SMichael Halcrow * stat of the lower directory inode. 193237fead6SMichael Halcrow * 194237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 195237fead6SMichael Halcrow */ 196237fead6SMichael Halcrow static int 197237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 198237fead6SMichael Halcrow struct dentry *ecryptfs_dentry, int mode, 199237fead6SMichael Halcrow struct nameidata *nd) 200237fead6SMichael Halcrow { 201237fead6SMichael Halcrow int rc; 202237fead6SMichael Halcrow struct dentry *lower_dentry; 203237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 204237fead6SMichael Halcrow 205237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 206237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 207801678c5SHirofumi Nakagawa if (IS_ERR(lower_dir_dentry)) { 208237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error locking directory of " 209237fead6SMichael Halcrow "dentry\n"); 210237fead6SMichael Halcrow rc = PTR_ERR(lower_dir_dentry); 211237fead6SMichael Halcrow goto out; 212237fead6SMichael Halcrow } 213237fead6SMichael Halcrow rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, 214237fead6SMichael Halcrow ecryptfs_dentry, mode, nd); 2154981e081SMichael Halcrow if (rc) { 216caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 21718d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 218237fead6SMichael Halcrow goto out_lock; 219237fead6SMichael Halcrow } 220237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 221237fead6SMichael Halcrow directory_inode->i_sb, 0); 222237fead6SMichael Halcrow if (rc) { 223237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); 224237fead6SMichael Halcrow goto out_lock; 225237fead6SMichael Halcrow } 2260cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); 2270cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); 228237fead6SMichael Halcrow out_lock: 229237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 230237fead6SMichael Halcrow out: 231237fead6SMichael Halcrow return rc; 232237fead6SMichael Halcrow } 233237fead6SMichael Halcrow 234237fead6SMichael Halcrow /** 235237fead6SMichael Halcrow * ecryptfs_initialize_file 236237fead6SMichael Halcrow * 237237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 238237fead6SMichael Halcrow * file with a header and first data page. 239237fead6SMichael Halcrow * 240237fead6SMichael Halcrow * Returns zero on success 241237fead6SMichael Halcrow */ 242237fead6SMichael Halcrow static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) 243237fead6SMichael Halcrow { 244d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 245d7cdc5feSMichael Halcrow &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; 246237fead6SMichael Halcrow int rc = 0; 247237fead6SMichael Halcrow 248237fead6SMichael Halcrow if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { 249237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 250e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 251d7cdc5feSMichael Halcrow goto out; 252237fead6SMichael Halcrow } 253237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 254237fead6SMichael Halcrow rc = ecryptfs_new_file_context(ecryptfs_dentry); 255237fead6SMichael Halcrow if (rc) { 256d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 257d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 258d7cdc5feSMichael Halcrow goto out; 259237fead6SMichael Halcrow } 260332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry); 261391b52f9SMichael Halcrow if (rc) { 262391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 263332ab16fSTyler Hicks "the lower file for the dentry with name " 264391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 265391b52f9SMichael Halcrow ecryptfs_dentry->d_name.name, rc); 266391b52f9SMichael Halcrow goto out; 267391b52f9SMichael Halcrow } 268d7cdc5feSMichael Halcrow rc = ecryptfs_write_metadata(ecryptfs_dentry); 269332ab16fSTyler Hicks if (rc) 270d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 271332ab16fSTyler Hicks ecryptfs_put_lower_file(ecryptfs_dentry->d_inode); 272237fead6SMichael Halcrow out: 273237fead6SMichael Halcrow return rc; 274237fead6SMichael Halcrow } 275237fead6SMichael Halcrow 276237fead6SMichael Halcrow /** 277237fead6SMichael Halcrow * ecryptfs_create 278237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 279237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 280237fead6SMichael Halcrow * @mode: The mode of the new file. 281237fead6SMichael Halcrow * @nd: nameidata 282237fead6SMichael Halcrow * 283237fead6SMichael Halcrow * Creates a new file. 284237fead6SMichael Halcrow * 285237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 286237fead6SMichael Halcrow */ 287237fead6SMichael Halcrow static int 288237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 289237fead6SMichael Halcrow int mode, struct nameidata *nd) 290237fead6SMichael Halcrow { 291237fead6SMichael Halcrow int rc; 292237fead6SMichael Halcrow 293addd65adSMichael Halcrow /* ecryptfs_do_create() calls ecryptfs_interpose() */ 294237fead6SMichael Halcrow rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); 295237fead6SMichael Halcrow if (unlikely(rc)) { 296237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 297237fead6SMichael Halcrow "lower filesystem\n"); 298237fead6SMichael Halcrow goto out; 299237fead6SMichael Halcrow } 300237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 301237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 302237fead6SMichael Halcrow rc = ecryptfs_initialize_file(ecryptfs_dentry); 303237fead6SMichael Halcrow out: 304237fead6SMichael Halcrow return rc; 305237fead6SMichael Halcrow } 306237fead6SMichael Halcrow 307237fead6SMichael Halcrow /** 308addd65adSMichael Halcrow * ecryptfs_lookup_and_interpose_lower - Perform a lookup 309237fead6SMichael Halcrow */ 310addd65adSMichael Halcrow int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, 311addd65adSMichael Halcrow struct dentry *lower_dentry, 31270b89021STyler Hicks struct inode *ecryptfs_dir_inode) 313237fead6SMichael Halcrow { 314237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 315237fead6SMichael Halcrow struct vfsmount *lower_mnt; 316addd65adSMichael Halcrow struct inode *lower_inode; 3172aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 318237fead6SMichael Halcrow char *page_virt = NULL; 319332ab16fSTyler Hicks int put_lower = 0, rc = 0; 320237fead6SMichael Halcrow 321addd65adSMichael Halcrow lower_dir_dentry = lower_dentry->d_parent; 322addd65adSMichael Halcrow lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( 323addd65adSMichael Halcrow ecryptfs_dentry->d_parent)); 324237fead6SMichael Halcrow lower_inode = lower_dentry->d_inode; 325addd65adSMichael Halcrow fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); 326b7ab39f6SNick Piggin BUG_ON(!lower_dentry->d_count); 327addd65adSMichael Halcrow ecryptfs_set_dentry_private(ecryptfs_dentry, 328237fead6SMichael Halcrow kmem_cache_alloc(ecryptfs_dentry_info_cache, 329e94b1766SChristoph Lameter GFP_KERNEL)); 330addd65adSMichael Halcrow if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { 331237fead6SMichael Halcrow rc = -ENOMEM; 332addd65adSMichael Halcrow printk(KERN_ERR "%s: Out of memory whilst attempting " 333addd65adSMichael Halcrow "to allocate ecryptfs_dentry_info struct\n", 334addd65adSMichael Halcrow __func__); 33531f73beeSLino Sanfilippo goto out_put; 336237fead6SMichael Halcrow } 337addd65adSMichael Halcrow ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); 338addd65adSMichael Halcrow ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); 339237fead6SMichael Halcrow if (!lower_dentry->d_inode) { 340237fead6SMichael Halcrow /* We want to add because we couldn't find in lower */ 341addd65adSMichael Halcrow d_add(ecryptfs_dentry, NULL); 342237fead6SMichael Halcrow goto out; 343237fead6SMichael Halcrow } 344addd65adSMichael Halcrow rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, 3453469b573SErez Zadok ecryptfs_dir_inode->i_sb, 3463469b573SErez Zadok ECRYPTFS_INTERPOSE_FLAG_D_ADD); 347237fead6SMichael Halcrow if (rc) { 348addd65adSMichael Halcrow printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", 349addd65adSMichael Halcrow __func__, rc); 350391b52f9SMichael Halcrow goto out; 351237fead6SMichael Halcrow } 352addd65adSMichael Halcrow if (S_ISDIR(lower_inode->i_mode)) 353237fead6SMichael Halcrow goto out; 354addd65adSMichael Halcrow if (S_ISLNK(lower_inode->i_mode)) 355237fead6SMichael Halcrow goto out; 356addd65adSMichael Halcrow if (special_file(lower_inode->i_mode)) 357202a21d6SRyusuke Konishi goto out; 358237fead6SMichael Halcrow /* Released in this function */ 359addd65adSMichael Halcrow page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); 360237fead6SMichael Halcrow if (!page_virt) { 361addd65adSMichael Halcrow printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", 362addd65adSMichael Halcrow __func__); 363237fead6SMichael Halcrow rc = -ENOMEM; 364391b52f9SMichael Halcrow goto out; 365237fead6SMichael Halcrow } 366332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry); 367391b52f9SMichael Halcrow if (rc) { 368391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 369332ab16fSTyler Hicks "the lower file for the dentry with name " 370391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 371addd65adSMichael Halcrow ecryptfs_dentry->d_name.name, rc); 372addd65adSMichael Halcrow goto out_free_kmem; 373391b52f9SMichael Halcrow } 374332ab16fSTyler Hicks put_lower = 1; 3752aac0cf8STyler Hicks crypt_stat = &ecryptfs_inode_to_private( 3762aac0cf8STyler Hicks ecryptfs_dentry->d_inode)->crypt_stat; 3772aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3782aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3792aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 380d7cdc5feSMichael Halcrow rc = ecryptfs_read_and_validate_header_region(page_virt, 381addd65adSMichael Halcrow ecryptfs_dentry->d_inode); 382237fead6SMichael Halcrow if (rc) { 3831984c23fSTyler Hicks memset(page_virt, 0, PAGE_CACHE_SIZE); 384addd65adSMichael Halcrow rc = ecryptfs_read_and_validate_xattr_region(page_virt, 385addd65adSMichael Halcrow ecryptfs_dentry); 386dd2a3b7aSMichael Halcrow if (rc) { 387237fead6SMichael Halcrow rc = 0; 388addd65adSMichael Halcrow goto out_free_kmem; 389237fead6SMichael Halcrow } 390dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 391dd2a3b7aSMichael Halcrow } 3923aeb86eaSTyler Hicks ecryptfs_i_size_init(page_virt, ecryptfs_dentry->d_inode); 393addd65adSMichael Halcrow out_free_kmem: 394237fead6SMichael Halcrow kmem_cache_free(ecryptfs_header_cache_2, page_virt); 395237fead6SMichael Halcrow goto out; 39631f73beeSLino Sanfilippo out_put: 397237fead6SMichael Halcrow dput(lower_dentry); 39831f73beeSLino Sanfilippo mntput(lower_mnt); 399addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 400237fead6SMichael Halcrow out: 401332ab16fSTyler Hicks if (put_lower) 402332ab16fSTyler Hicks ecryptfs_put_lower_file(ecryptfs_dentry->d_inode); 403addd65adSMichael Halcrow return rc; 404addd65adSMichael Halcrow } 405addd65adSMichael Halcrow 406addd65adSMichael Halcrow /** 407addd65adSMichael Halcrow * ecryptfs_lookup 408addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 409addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 410addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 411addd65adSMichael Halcrow * 412addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 413addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 414addd65adSMichael Halcrow */ 415addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 416addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 417addd65adSMichael Halcrow struct nameidata *ecryptfs_nd) 418addd65adSMichael Halcrow { 419addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 420a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 421addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 422addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 423addd65adSMichael Halcrow int rc = 0; 424addd65adSMichael Halcrow 425addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 426addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 427addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 428addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 429addd65adSMichael Halcrow goto out_d_drop; 430addd65adSMichael Halcrow } 431addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 4328787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4338787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 4348787c7a3STyler Hicks lower_dir_dentry, 4358787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 4368787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 437addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 438addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4398787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4409f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 4419f37622fSTyler Hicks encrypted_and_encoded_name); 442addd65adSMichael Halcrow goto out_d_drop; 443addd65adSMichael Halcrow } 444addd65adSMichael Halcrow if (lower_dentry->d_inode) 445addd65adSMichael Halcrow goto lookup_and_interpose; 446addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 447addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 4482aac0cf8STyler Hicks if (!(mount_crypt_stat 4492aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 450addd65adSMichael Halcrow goto lookup_and_interpose; 451addd65adSMichael Halcrow dput(lower_dentry); 452addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 453addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 4542aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 455addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 456addd65adSMichael Halcrow if (rc) { 457addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 458addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 459addd65adSMichael Halcrow goto out_d_drop; 460addd65adSMichael Halcrow } 4618787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4628787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 4638787c7a3STyler Hicks lower_dir_dentry, 4648787c7a3STyler Hicks encrypted_and_encoded_name_size); 4658787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 466addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 467addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4688787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4699f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 470addd65adSMichael Halcrow encrypted_and_encoded_name); 471addd65adSMichael Halcrow goto out_d_drop; 472addd65adSMichael Halcrow } 473addd65adSMichael Halcrow lookup_and_interpose: 474addd65adSMichael Halcrow rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, 47570b89021STyler Hicks ecryptfs_dir_inode); 476addd65adSMichael Halcrow goto out; 477addd65adSMichael Halcrow out_d_drop: 478addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 479addd65adSMichael Halcrow out: 480addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 481237fead6SMichael Halcrow return ERR_PTR(rc); 482237fead6SMichael Halcrow } 483237fead6SMichael Halcrow 484237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 485237fead6SMichael Halcrow struct dentry *new_dentry) 486237fead6SMichael Halcrow { 487237fead6SMichael Halcrow struct dentry *lower_old_dentry; 488237fead6SMichael Halcrow struct dentry *lower_new_dentry; 489237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 490237fead6SMichael Halcrow u64 file_size_save; 491237fead6SMichael Halcrow int rc; 492237fead6SMichael Halcrow 493237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 494237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 495237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 496237fead6SMichael Halcrow dget(lower_old_dentry); 497237fead6SMichael Halcrow dget(lower_new_dentry); 498237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 499237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 500237fead6SMichael Halcrow lower_new_dentry); 501237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 502237fead6SMichael Halcrow goto out_lock; 503237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); 504237fead6SMichael Halcrow if (rc) 505237fead6SMichael Halcrow goto out_lock; 5063a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5073a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 508237fead6SMichael Halcrow old_dentry->d_inode->i_nlink = 509237fead6SMichael Halcrow ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; 510237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 511237fead6SMichael Halcrow out_lock: 512237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 513237fead6SMichael Halcrow dput(lower_new_dentry); 514237fead6SMichael Halcrow dput(lower_old_dentry); 515237fead6SMichael Halcrow return rc; 516237fead6SMichael Halcrow } 517237fead6SMichael Halcrow 518237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 519237fead6SMichael Halcrow { 520237fead6SMichael Halcrow int rc = 0; 521237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 522237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 5238dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 524237fead6SMichael Halcrow 5259c2d2056STyler Hicks dget(lower_dentry); 5268dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 527237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 528237fead6SMichael Halcrow if (rc) { 529ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 530237fead6SMichael Halcrow goto out_unlock; 531237fead6SMichael Halcrow } 5320cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 533237fead6SMichael Halcrow dentry->d_inode->i_nlink = 534237fead6SMichael Halcrow ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; 535237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 536caeeeecfSMichael Halcrow d_drop(dentry); 537237fead6SMichael Halcrow out_unlock: 5388dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 5399c2d2056STyler Hicks dput(lower_dentry); 540237fead6SMichael Halcrow return rc; 541237fead6SMichael Halcrow } 542237fead6SMichael Halcrow 543237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 544237fead6SMichael Halcrow const char *symname) 545237fead6SMichael Halcrow { 546237fead6SMichael Halcrow int rc; 547237fead6SMichael Halcrow struct dentry *lower_dentry; 548237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 549237fead6SMichael Halcrow char *encoded_symname; 550addd65adSMichael Halcrow size_t encoded_symlen; 551addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 552237fead6SMichael Halcrow 553237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 554237fead6SMichael Halcrow dget(lower_dentry); 555237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 556addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 557addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 558addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 559addd65adSMichael Halcrow &encoded_symlen, 560addd65adSMichael Halcrow NULL, 561addd65adSMichael Halcrow mount_crypt_stat, symname, 562addd65adSMichael Halcrow strlen(symname)); 563addd65adSMichael Halcrow if (rc) 564237fead6SMichael Halcrow goto out_lock; 565237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 566db2e747bSMiklos Szeredi encoded_symname); 567237fead6SMichael Halcrow kfree(encoded_symname); 568237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 569237fead6SMichael Halcrow goto out_lock; 570237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 571237fead6SMichael Halcrow if (rc) 572237fead6SMichael Halcrow goto out_lock; 5730cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5740cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 575237fead6SMichael Halcrow out_lock: 576237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 577237fead6SMichael Halcrow dput(lower_dentry); 578237fead6SMichael Halcrow if (!dentry->d_inode) 579237fead6SMichael Halcrow d_drop(dentry); 580237fead6SMichael Halcrow return rc; 581237fead6SMichael Halcrow } 582237fead6SMichael Halcrow 583237fead6SMichael Halcrow static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 584237fead6SMichael Halcrow { 585237fead6SMichael Halcrow int rc; 586237fead6SMichael Halcrow struct dentry *lower_dentry; 587237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 588237fead6SMichael Halcrow 589237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 590237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 591237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 592237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 593237fead6SMichael Halcrow goto out; 594237fead6SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 595237fead6SMichael Halcrow if (rc) 596237fead6SMichael Halcrow goto out; 5970cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5980cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 599237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 600237fead6SMichael Halcrow out: 601237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 602237fead6SMichael Halcrow if (!dentry->d_inode) 603237fead6SMichael Halcrow d_drop(dentry); 604237fead6SMichael Halcrow return rc; 605237fead6SMichael Halcrow } 606237fead6SMichael Halcrow 607237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 608237fead6SMichael Halcrow { 609237fead6SMichael Halcrow struct dentry *lower_dentry; 610237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 61145ec4abaSMichael Halcrow int rc; 612237fead6SMichael Halcrow 613237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 61445ec4abaSMichael Halcrow dget(dentry); 615237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 61645ec4abaSMichael Halcrow dget(lower_dentry); 617237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 61845ec4abaSMichael Halcrow dput(lower_dentry); 61907850552STyler Hicks if (!rc && dentry->d_inode) 62007850552STyler Hicks clear_nlink(dentry->d_inode); 6210cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 622237fead6SMichael Halcrow dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; 623237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 624237fead6SMichael Halcrow if (!rc) 625237fead6SMichael Halcrow d_drop(dentry); 62645ec4abaSMichael Halcrow dput(dentry); 627237fead6SMichael Halcrow return rc; 628237fead6SMichael Halcrow } 629237fead6SMichael Halcrow 630237fead6SMichael Halcrow static int 631237fead6SMichael Halcrow ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) 632237fead6SMichael Halcrow { 633237fead6SMichael Halcrow int rc; 634237fead6SMichael Halcrow struct dentry *lower_dentry; 635237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 636237fead6SMichael Halcrow 637237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 638237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 639237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 640237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 641237fead6SMichael Halcrow goto out; 642391b52f9SMichael Halcrow rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); 643237fead6SMichael Halcrow if (rc) 644237fead6SMichael Halcrow goto out; 6450cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 6460cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 647237fead6SMichael Halcrow out: 648237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 649237fead6SMichael Halcrow if (!dentry->d_inode) 650237fead6SMichael Halcrow d_drop(dentry); 651237fead6SMichael Halcrow return rc; 652237fead6SMichael Halcrow } 653237fead6SMichael Halcrow 654237fead6SMichael Halcrow static int 655237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 656237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 657237fead6SMichael Halcrow { 658237fead6SMichael Halcrow int rc; 659237fead6SMichael Halcrow struct dentry *lower_old_dentry; 660237fead6SMichael Halcrow struct dentry *lower_new_dentry; 661237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 662237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6630d132f73SErez Zadok struct dentry *trap = NULL; 664237fead6SMichael Halcrow 665237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 666237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 667237fead6SMichael Halcrow dget(lower_old_dentry); 668237fead6SMichael Halcrow dget(lower_new_dentry); 669237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 670237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6710d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6720d132f73SErez Zadok /* source should not be ancestor of target */ 6730d132f73SErez Zadok if (trap == lower_old_dentry) { 6740d132f73SErez Zadok rc = -EINVAL; 6750d132f73SErez Zadok goto out_lock; 6760d132f73SErez Zadok } 6770d132f73SErez Zadok /* target should not be ancestor of source */ 6780d132f73SErez Zadok if (trap == lower_new_dentry) { 6790d132f73SErez Zadok rc = -ENOTEMPTY; 6800d132f73SErez Zadok goto out_lock; 6810d132f73SErez Zadok } 682237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 683237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 684237fead6SMichael Halcrow if (rc) 685237fead6SMichael Halcrow goto out_lock; 6869afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 687237fead6SMichael Halcrow if (new_dir != old_dir) 6889afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 689237fead6SMichael Halcrow out_lock: 690237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 691dd55c898STyler Hicks dput(lower_new_dir_dentry); 692dd55c898STyler Hicks dput(lower_old_dir_dentry); 693237fead6SMichael Halcrow dput(lower_new_dentry); 694237fead6SMichael Halcrow dput(lower_old_dentry); 695237fead6SMichael Halcrow return rc; 696237fead6SMichael Halcrow } 697237fead6SMichael Halcrow 6983a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 6993a60a168STyler Hicks size_t *bufsiz) 700237fead6SMichael Halcrow { 7013a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 702237fead6SMichael Halcrow char *lower_buf; 7033a60a168STyler Hicks size_t lower_bufsiz = PATH_MAX; 704addd65adSMichael Halcrow mm_segment_t old_fs; 705addd65adSMichael Halcrow int rc; 706237fead6SMichael Halcrow 7073a6b42caSTyler Hicks lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); 7083a60a168STyler Hicks if (!lower_buf) { 709237fead6SMichael Halcrow rc = -ENOMEM; 710237fead6SMichael Halcrow goto out; 711237fead6SMichael Halcrow } 712237fead6SMichael Halcrow old_fs = get_fs(); 713237fead6SMichael Halcrow set_fs(get_ds()); 714237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 715237fead6SMichael Halcrow (char __user *)lower_buf, 7163a6b42caSTyler Hicks lower_bufsiz); 717237fead6SMichael Halcrow set_fs(old_fs); 7183a60a168STyler Hicks if (rc < 0) 7193a60a168STyler Hicks goto out; 7203a60a168STyler Hicks lower_bufsiz = rc; 7213a60a168STyler Hicks rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, 7223a60a168STyler Hicks lower_buf, lower_bufsiz); 7233a60a168STyler Hicks out: 724237fead6SMichael Halcrow kfree(lower_buf); 7253a60a168STyler Hicks return rc; 7263a60a168STyler Hicks } 7273a60a168STyler Hicks 7283a60a168STyler Hicks static int 7293a60a168STyler Hicks ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) 7303a60a168STyler Hicks { 7313a60a168STyler Hicks char *kbuf; 7323a60a168STyler Hicks size_t kbufsiz, copied; 7333a60a168STyler Hicks int rc; 7343a60a168STyler Hicks 7353a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); 7363a60a168STyler Hicks if (rc) 7373a60a168STyler Hicks goto out; 7383a60a168STyler Hicks copied = min_t(size_t, bufsiz, kbufsiz); 7393a60a168STyler Hicks rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; 7403a60a168STyler Hicks kfree(kbuf); 7413a60a168STyler Hicks fsstack_copy_attr_atime(dentry->d_inode, 7423a60a168STyler Hicks ecryptfs_dentry_to_lower(dentry)->d_inode); 743237fead6SMichael Halcrow out: 744237fead6SMichael Halcrow return rc; 745237fead6SMichael Halcrow } 746237fead6SMichael Halcrow 747237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 748237fead6SMichael Halcrow { 749237fead6SMichael Halcrow char *buf; 750237fead6SMichael Halcrow int len = PAGE_SIZE, rc; 751237fead6SMichael Halcrow mm_segment_t old_fs; 752237fead6SMichael Halcrow 753237fead6SMichael Halcrow /* Released in ecryptfs_put_link(); only release here on error */ 754237fead6SMichael Halcrow buf = kmalloc(len, GFP_KERNEL); 755237fead6SMichael Halcrow if (!buf) { 756806892e9SOGAWA Hirofumi buf = ERR_PTR(-ENOMEM); 757237fead6SMichael Halcrow goto out; 758237fead6SMichael Halcrow } 759237fead6SMichael Halcrow old_fs = get_fs(); 760237fead6SMichael Halcrow set_fs(get_ds()); 761237fead6SMichael Halcrow rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); 762237fead6SMichael Halcrow set_fs(old_fs); 763806892e9SOGAWA Hirofumi if (rc < 0) { 764237fead6SMichael Halcrow kfree(buf); 765806892e9SOGAWA Hirofumi buf = ERR_PTR(rc); 766806892e9SOGAWA Hirofumi } else 767806892e9SOGAWA Hirofumi buf[rc] = '\0'; 768237fead6SMichael Halcrow out: 769806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 770806892e9SOGAWA Hirofumi return NULL; 771237fead6SMichael Halcrow } 772237fead6SMichael Halcrow 773237fead6SMichael Halcrow static void 774237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 775237fead6SMichael Halcrow { 776806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 777806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 778237fead6SMichael Halcrow /* Free the char* */ 779806892e9SOGAWA Hirofumi kfree(buf); 780806892e9SOGAWA Hirofumi } 781237fead6SMichael Halcrow } 782237fead6SMichael Halcrow 783237fead6SMichael Halcrow /** 784237fead6SMichael Halcrow * upper_size_to_lower_size 785237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 786237fead6SMichael Halcrow * @upper_size: Size of the upper file 787237fead6SMichael Halcrow * 788cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 789237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 790237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 791237fead6SMichael Halcrow * 792237fead6SMichael Halcrow * Returns Calculated size of the lower file. 793237fead6SMichael Halcrow */ 794237fead6SMichael Halcrow static loff_t 795237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 796237fead6SMichael Halcrow loff_t upper_size) 797237fead6SMichael Halcrow { 798237fead6SMichael Halcrow loff_t lower_size; 799237fead6SMichael Halcrow 800157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 801237fead6SMichael Halcrow if (upper_size != 0) { 802237fead6SMichael Halcrow loff_t num_extents; 803237fead6SMichael Halcrow 804237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 805237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 806237fead6SMichael Halcrow num_extents++; 807237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 808237fead6SMichael Halcrow } 809237fead6SMichael Halcrow return lower_size; 810237fead6SMichael Halcrow } 811237fead6SMichael Halcrow 812237fead6SMichael Halcrow /** 8135f3ef64fSTyler Hicks * truncate_upper 814237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 8155f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 8165f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 817237fead6SMichael Halcrow * 818237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 819237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 8205f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 8215f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 8225f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 8235f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 8245f3ef64fSTyler Hicks * the truncation of the lower inode. 825237fead6SMichael Halcrow * 826237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 827237fead6SMichael Halcrow */ 8285f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 8295f3ef64fSTyler Hicks struct iattr *lower_ia) 830237fead6SMichael Halcrow { 831237fead6SMichael Halcrow int rc = 0; 832237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 833237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 834237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 835237fead6SMichael Halcrow loff_t lower_size_before_truncate; 836237fead6SMichael Halcrow loff_t lower_size_after_truncate; 837237fead6SMichael Halcrow 8385f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 8395f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 840332ab16fSTyler Hicks return 0; 8415f3ef64fSTyler Hicks } 842332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(dentry); 843332ab16fSTyler Hicks if (rc) 844332ab16fSTyler Hicks return rc; 845237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 846237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 8475f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 8482ed92554SMichael Halcrow char zero[] = { 0x00 }; 849240e2df5SMichael Halcrow 8505f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 8512ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 8522ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 8532ed92554SMichael Halcrow * the intermediate portion of the previous end of the 8542ed92554SMichael Halcrow * file and the new and of the file */ 85548c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 8565f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 8575f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 8585f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 8595f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 8605f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 8612ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 8622ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 8635f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 8642ed92554SMichael Halcrow 8652c27c65eSChristoph Hellwig 8662c27c65eSChristoph Hellwig /* 8672c27c65eSChristoph Hellwig * XXX(truncate) this should really happen at the begginning 8682c27c65eSChristoph Hellwig * of ->setattr. But the code is too messy to that as part 8692c27c65eSChristoph Hellwig * of a larger patch. ecryptfs is also totally missing out 8702c27c65eSChristoph Hellwig * on the inode_change_ok check at the beginning of 8712c27c65eSChristoph Hellwig * ->setattr while would include this. 8722c27c65eSChristoph Hellwig */ 8732c27c65eSChristoph Hellwig rc = inode_newsize_ok(inode, ia->ia_size); 87413a791b4STyler Hicks if (rc) 87548c1e44aSAl Viro goto out; 8762c27c65eSChristoph Hellwig 8772c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 8782c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8795f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 8805f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 88148c1e44aSAl Viro goto out; 88213a791b4STyler Hicks } 8832ed92554SMichael Halcrow if (num_zeros) { 8842ed92554SMichael Halcrow char *zeros_virt; 8852ed92554SMichael Halcrow 8862ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8872ed92554SMichael Halcrow if (!zeros_virt) { 8882ed92554SMichael Halcrow rc = -ENOMEM; 88948c1e44aSAl Viro goto out; 890240e2df5SMichael Halcrow } 89148c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8925f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8932ed92554SMichael Halcrow kfree(zeros_virt); 8945dda6992SMichael Halcrow if (rc) { 895240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 896240e2df5SMichael Halcrow "the remainder of the end page on " 897240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 89848c1e44aSAl Viro goto out; 899240e2df5SMichael Halcrow } 900240e2df5SMichael Halcrow } 9012c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 9020216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 903dd2a3b7aSMichael Halcrow if (rc) { 904dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 905dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 906dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 90748c1e44aSAl Viro goto out; 908dd2a3b7aSMichael Halcrow } 909237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 910237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 911237fead6SMichael Halcrow lower_size_before_truncate = 912237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 913237fead6SMichael Halcrow lower_size_after_truncate = 9145f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 9155f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 9165f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 9175f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 9185f3ef64fSTyler Hicks } else 9195f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 920237fead6SMichael Halcrow } 921237fead6SMichael Halcrow out: 922332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 923237fead6SMichael Halcrow return rc; 924237fead6SMichael Halcrow } 925237fead6SMichael Halcrow 9265f3ef64fSTyler Hicks /** 9275f3ef64fSTyler Hicks * ecryptfs_truncate 9285f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 9295f3ef64fSTyler Hicks * @new_length: The length to expand the file to 9305f3ef64fSTyler Hicks * 9315f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 9325f3ef64fSTyler Hicks * its corresponding lower inode. 9335f3ef64fSTyler Hicks * 9345f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 9355f3ef64fSTyler Hicks */ 9365f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 9375f3ef64fSTyler Hicks { 9385f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 9395f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 9405f3ef64fSTyler Hicks int rc; 9415f3ef64fSTyler Hicks 9425f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 9435f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 9445f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 9455f3ef64fSTyler Hicks 9465f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 9475f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9485f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 9495f3ef64fSTyler Hicks } 9505f3ef64fSTyler Hicks return rc; 9515f3ef64fSTyler Hicks } 9525f3ef64fSTyler Hicks 953237fead6SMichael Halcrow static int 954b74c79e9SNick Piggin ecryptfs_permission(struct inode *inode, int mask, unsigned int flags) 955237fead6SMichael Halcrow { 956b74c79e9SNick Piggin if (flags & IPERM_FLAG_RCU) 957b74c79e9SNick Piggin return -ECHILD; 958f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 959237fead6SMichael Halcrow } 960237fead6SMichael Halcrow 961237fead6SMichael Halcrow /** 962237fead6SMichael Halcrow * ecryptfs_setattr 963237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 964237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 965237fead6SMichael Halcrow * 966237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 967237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 968237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 969237fead6SMichael Halcrow * 970237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 971237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 972237fead6SMichael Halcrow */ 973237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 974237fead6SMichael Halcrow { 975237fead6SMichael Halcrow int rc = 0; 976237fead6SMichael Halcrow struct dentry *lower_dentry; 9775f3ef64fSTyler Hicks struct iattr lower_ia; 978237fead6SMichael Halcrow struct inode *inode; 979237fead6SMichael Halcrow struct inode *lower_inode; 980237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 981237fead6SMichael Halcrow 982237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 983e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 984e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 985237fead6SMichael Halcrow inode = dentry->d_inode; 986237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 987e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 988e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 989e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 990e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 99164ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 99264ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 99364ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 994e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 995e10f281bSMichael Halcrow 996e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 997e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 998332ab16fSTyler Hicks rc = ecryptfs_get_lower_file(dentry); 999332ab16fSTyler Hicks if (rc) { 1000332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 1001332ab16fSTyler Hicks goto out; 1002332ab16fSTyler Hicks } 1003d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 1004332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 10055dda6992SMichael Halcrow if (rc) { 1006e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 1007e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 1008e10f281bSMichael Halcrow rc = -EIO; 100925bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 1010e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 101125bd8174SMichael Halcrow "or the key could not be retrieved. " 101225bd8174SMichael Halcrow "Plaintext passthrough mode is not " 1013e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 1014e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 1015e10f281bSMichael Halcrow goto out; 1016e10f281bSMichael Halcrow } 1017e10f281bSMichael Halcrow rc = 0; 10183aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 10193aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 1020e10f281bSMichael Halcrow } 1021e10f281bSMichael Halcrow } 1022e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 10235be79de2STyler Hicks if (S_ISREG(inode->i_mode)) { 10245be79de2STyler Hicks rc = filemap_write_and_wait(inode->i_mapping); 10255be79de2STyler Hicks if (rc) 10265be79de2STyler Hicks goto out; 10275be79de2STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 10285be79de2STyler Hicks } 10295f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 10305f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 10315f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 1032237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 10335f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 1034237fead6SMichael Halcrow if (rc < 0) 1035237fead6SMichael Halcrow goto out; 1036237fead6SMichael Halcrow } 10371ac564ecSJeff Layton 10381ac564ecSJeff Layton /* 10391ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 10401ac564ecSJeff Layton * to interpret this in its own way. 10411ac564ecSJeff Layton */ 10425f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 10435f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 10441ac564ecSJeff Layton 10459c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 10465f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 10479c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 1048237fead6SMichael Halcrow out: 10499afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 1050237fead6SMichael Halcrow return rc; 1051237fead6SMichael Halcrow } 1052237fead6SMichael Halcrow 10533a60a168STyler Hicks int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 10543a60a168STyler Hicks struct kstat *stat) 10553a60a168STyler Hicks { 10563a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 10573a60a168STyler Hicks int rc = 0; 10583a60a168STyler Hicks 10593a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 10603a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 10613a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 10623a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 10633a60a168STyler Hicks char *target; 10643a60a168STyler Hicks size_t targetsiz; 10653a60a168STyler Hicks 10663a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 10673a60a168STyler Hicks if (!rc) { 10683a60a168STyler Hicks kfree(target); 10693a60a168STyler Hicks stat->size = targetsiz; 10703a60a168STyler Hicks } 10713a60a168STyler Hicks } 10723a60a168STyler Hicks return rc; 10733a60a168STyler Hicks } 10743a60a168STyler Hicks 1075f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1076f8f484d1STyler Hicks struct kstat *stat) 1077f8f484d1STyler Hicks { 1078f8f484d1STyler Hicks struct kstat lower_stat; 1079f8f484d1STyler Hicks int rc; 1080f8f484d1STyler Hicks 1081f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 1082f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 1083f8f484d1STyler Hicks if (!rc) { 108455f9cf6bSTyler Hicks fsstack_copy_attr_all(dentry->d_inode, 108555f9cf6bSTyler Hicks ecryptfs_inode_to_lower(dentry->d_inode)); 1086f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1087f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1088f8f484d1STyler Hicks } 1089f8f484d1STyler Hicks return rc; 1090f8f484d1STyler Hicks } 1091f8f484d1STyler Hicks 1092dd2a3b7aSMichael Halcrow int 1093237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1094237fead6SMichael Halcrow size_t size, int flags) 1095237fead6SMichael Halcrow { 1096237fead6SMichael Halcrow int rc = 0; 1097237fead6SMichael Halcrow struct dentry *lower_dentry; 1098237fead6SMichael Halcrow 1099237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1100237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1101cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1102237fead6SMichael Halcrow goto out; 1103237fead6SMichael Halcrow } 110448b512e6SRoberto Sassu 110548b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 1106237fead6SMichael Halcrow out: 1107237fead6SMichael Halcrow return rc; 1108237fead6SMichael Halcrow } 1109237fead6SMichael Halcrow 1110dd2a3b7aSMichael Halcrow ssize_t 1111d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1112d7cdc5feSMichael Halcrow void *value, size_t size) 1113d7cdc5feSMichael Halcrow { 1114d7cdc5feSMichael Halcrow int rc = 0; 1115d7cdc5feSMichael Halcrow 1116d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1117cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1118d7cdc5feSMichael Halcrow goto out; 1119d7cdc5feSMichael Halcrow } 1120d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1121d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1122d7cdc5feSMichael Halcrow size); 1123d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1124d7cdc5feSMichael Halcrow out: 1125d7cdc5feSMichael Halcrow return rc; 1126d7cdc5feSMichael Halcrow } 1127d7cdc5feSMichael Halcrow 11287896b631SAdrian Bunk static ssize_t 1129237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1130237fead6SMichael Halcrow size_t size) 1131237fead6SMichael Halcrow { 11322ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 11332ed92554SMichael Halcrow value, size); 1134237fead6SMichael Halcrow } 1135237fead6SMichael Halcrow 1136237fead6SMichael Halcrow static ssize_t 1137237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1138237fead6SMichael Halcrow { 1139237fead6SMichael Halcrow int rc = 0; 1140237fead6SMichael Halcrow struct dentry *lower_dentry; 1141237fead6SMichael Halcrow 1142237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1143237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1144cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1145237fead6SMichael Halcrow goto out; 1146237fead6SMichael Halcrow } 1147237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1148237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1149237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1150237fead6SMichael Halcrow out: 1151237fead6SMichael Halcrow return rc; 1152237fead6SMichael Halcrow } 1153237fead6SMichael Halcrow 1154237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1155237fead6SMichael Halcrow { 1156237fead6SMichael Halcrow int rc = 0; 1157237fead6SMichael Halcrow struct dentry *lower_dentry; 1158237fead6SMichael Halcrow 1159237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1160237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1161cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1162237fead6SMichael Halcrow goto out; 1163237fead6SMichael Halcrow } 1164237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1165237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1166237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1167237fead6SMichael Halcrow out: 1168237fead6SMichael Halcrow return rc; 1169237fead6SMichael Halcrow } 1170237fead6SMichael Halcrow 1171754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1172237fead6SMichael Halcrow .readlink = ecryptfs_readlink, 1173237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1174237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1175237fead6SMichael Halcrow .permission = ecryptfs_permission, 1176237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11773a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1178237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1179237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1180237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1181237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1182237fead6SMichael Halcrow }; 1183237fead6SMichael Halcrow 1184754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1185237fead6SMichael Halcrow .create = ecryptfs_create, 1186237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1187237fead6SMichael Halcrow .link = ecryptfs_link, 1188237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1189237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1190237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1191237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1192237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1193237fead6SMichael Halcrow .rename = ecryptfs_rename, 1194237fead6SMichael Halcrow .permission = ecryptfs_permission, 1195237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1196237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1197237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1198237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1199237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1200237fead6SMichael Halcrow }; 1201237fead6SMichael Halcrow 1202754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1203237fead6SMichael Halcrow .permission = ecryptfs_permission, 1204237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1205f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1206237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1207237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1208237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1209237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1210237fead6SMichael Halcrow }; 1211