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 615ccf9203STyler Hicks static int ecryptfs_inode_set(struct inode *inode, void *opaque) 62c4f79073STyler Hicks { 635ccf9203STyler Hicks struct inode *lower_inode = opaque; 645ccf9203STyler Hicks 655ccf9203STyler Hicks ecryptfs_set_inode_lower(inode, lower_inode); 665ccf9203STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 675ccf9203STyler Hicks /* i_size will be overwritten for encrypted regular files */ 685ccf9203STyler Hicks fsstack_copy_inode_size(inode, lower_inode); 695ccf9203STyler Hicks inode->i_ino = lower_inode->i_ino; 70c4f79073STyler Hicks inode->i_version++; 71c4f79073STyler Hicks inode->i_mapping->a_ops = &ecryptfs_aops; 72985ca0e6SThieu Le inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi; 735ccf9203STyler Hicks 745ccf9203STyler Hicks if (S_ISLNK(inode->i_mode)) 755ccf9203STyler Hicks inode->i_op = &ecryptfs_symlink_iops; 765ccf9203STyler Hicks else if (S_ISDIR(inode->i_mode)) 775ccf9203STyler Hicks inode->i_op = &ecryptfs_dir_iops; 785ccf9203STyler Hicks else 795ccf9203STyler Hicks inode->i_op = &ecryptfs_main_iops; 805ccf9203STyler Hicks 815ccf9203STyler Hicks if (S_ISDIR(inode->i_mode)) 825ccf9203STyler Hicks inode->i_fop = &ecryptfs_dir_fops; 835ccf9203STyler Hicks else if (special_file(inode->i_mode)) 845ccf9203STyler Hicks init_special_inode(inode, inode->i_mode, inode->i_rdev); 855ccf9203STyler Hicks else 865ccf9203STyler Hicks inode->i_fop = &ecryptfs_main_fops; 875ccf9203STyler Hicks 88c4f79073STyler Hicks return 0; 89c4f79073STyler Hicks } 90c4f79073STyler Hicks 915ccf9203STyler Hicks static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, 925ccf9203STyler Hicks struct super_block *sb) 935ccf9203STyler Hicks { 945ccf9203STyler Hicks struct inode *inode; 955ccf9203STyler Hicks 965ccf9203STyler Hicks if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) 975ccf9203STyler Hicks return ERR_PTR(-EXDEV); 985ccf9203STyler Hicks if (!igrab(lower_inode)) 995ccf9203STyler Hicks return ERR_PTR(-ESTALE); 1005ccf9203STyler Hicks inode = iget5_locked(sb, (unsigned long)lower_inode, 1015ccf9203STyler Hicks ecryptfs_inode_test, ecryptfs_inode_set, 1025ccf9203STyler Hicks lower_inode); 1035ccf9203STyler Hicks if (!inode) { 1045ccf9203STyler Hicks iput(lower_inode); 1055ccf9203STyler Hicks return ERR_PTR(-EACCES); 1065ccf9203STyler Hicks } 1075ccf9203STyler Hicks if (!(inode->i_state & I_NEW)) 1085ccf9203STyler Hicks iput(lower_inode); 1095ccf9203STyler Hicks 1105ccf9203STyler Hicks return inode; 1115ccf9203STyler Hicks } 1125ccf9203STyler Hicks 113c4f79073STyler Hicks struct inode *ecryptfs_get_inode(struct inode *lower_inode, 114c4f79073STyler Hicks struct super_block *sb) 115c4f79073STyler Hicks { 1165ccf9203STyler Hicks struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); 117c4f79073STyler Hicks 1185ccf9203STyler Hicks if (!IS_ERR(inode) && (inode->i_state & I_NEW)) 119c4f79073STyler Hicks unlock_new_inode(inode); 1205ccf9203STyler Hicks 121c4f79073STyler Hicks return inode; 122c4f79073STyler Hicks } 123c4f79073STyler Hicks 124c4f79073STyler Hicks /** 125c4f79073STyler Hicks * ecryptfs_interpose 126c4f79073STyler Hicks * @lower_dentry: Existing dentry in the lower filesystem 127c4f79073STyler Hicks * @dentry: ecryptfs' dentry 128c4f79073STyler Hicks * @sb: ecryptfs's super_block 129c4f79073STyler Hicks * 130c4f79073STyler Hicks * Interposes upper and lower dentries. 131c4f79073STyler Hicks * 132c4f79073STyler Hicks * Returns zero on success; non-zero otherwise 133c4f79073STyler Hicks */ 134c4f79073STyler Hicks static int ecryptfs_interpose(struct dentry *lower_dentry, 1355ccf9203STyler Hicks struct dentry *dentry, struct super_block *sb) 136c4f79073STyler Hicks { 1375ccf9203STyler Hicks struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb); 1385ccf9203STyler Hicks 139c4f79073STyler Hicks if (IS_ERR(inode)) 140c4f79073STyler Hicks return PTR_ERR(inode); 141c4f79073STyler Hicks d_instantiate(dentry, inode); 1425ccf9203STyler Hicks 143c4f79073STyler Hicks return 0; 144c4f79073STyler Hicks } 145c4f79073STyler Hicks 146237fead6SMichael Halcrow /** 147237fead6SMichael Halcrow * ecryptfs_do_create 148237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 149237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 150237fead6SMichael Halcrow * @mode: The mode of the new file 151237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 152237fead6SMichael Halcrow * 153237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 154237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 155237fead6SMichael Halcrow * stat of the lower directory inode. 156237fead6SMichael Halcrow * 157b59db43aSTyler Hicks * Returns the new eCryptfs inode on success; an ERR_PTR on error condition 158237fead6SMichael Halcrow */ 159b59db43aSTyler Hicks static struct inode * 160237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 161175a4eb7SAl Viro struct dentry *ecryptfs_dentry, umode_t mode) 162237fead6SMichael Halcrow { 163237fead6SMichael Halcrow int rc; 164237fead6SMichael Halcrow struct dentry *lower_dentry; 165237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 166b59db43aSTyler Hicks struct inode *inode; 167237fead6SMichael Halcrow 168237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 169237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 170801678c5SHirofumi Nakagawa if (IS_ERR(lower_dir_dentry)) { 171237fead6SMichael Halcrow ecryptfs_printk(KERN_ERR, "Error locking directory of " 172237fead6SMichael Halcrow "dentry\n"); 173b59db43aSTyler Hicks inode = ERR_CAST(lower_dir_dentry); 174237fead6SMichael Halcrow goto out; 175237fead6SMichael Halcrow } 17618cb1b08SAl Viro rc = vfs_create(lower_dir_dentry->d_inode, lower_dentry, mode, NULL); 1774981e081SMichael Halcrow if (rc) { 178caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 17918d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 180b59db43aSTyler Hicks inode = ERR_PTR(rc); 181237fead6SMichael Halcrow goto out_lock; 182237fead6SMichael Halcrow } 183b59db43aSTyler Hicks inode = __ecryptfs_get_inode(lower_dentry->d_inode, 1845ccf9203STyler Hicks directory_inode->i_sb); 185b59db43aSTyler Hicks if (IS_ERR(inode)) 186237fead6SMichael Halcrow goto out_lock; 1870cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); 1880cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); 189237fead6SMichael Halcrow out_lock: 190237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 191237fead6SMichael Halcrow out: 192b59db43aSTyler Hicks return inode; 193237fead6SMichael Halcrow } 194237fead6SMichael Halcrow 195237fead6SMichael Halcrow /** 196237fead6SMichael Halcrow * ecryptfs_initialize_file 197237fead6SMichael Halcrow * 198237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 199237fead6SMichael Halcrow * file with a header and first data page. 200237fead6SMichael Halcrow * 201237fead6SMichael Halcrow * Returns zero on success 202237fead6SMichael Halcrow */ 203b59db43aSTyler Hicks static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, 204b59db43aSTyler Hicks struct inode *ecryptfs_inode) 205237fead6SMichael Halcrow { 206d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 207b59db43aSTyler Hicks &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; 208237fead6SMichael Halcrow int rc = 0; 209237fead6SMichael Halcrow 210b59db43aSTyler Hicks if (S_ISDIR(ecryptfs_inode->i_mode)) { 211237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 212e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 213d7cdc5feSMichael Halcrow goto out; 214237fead6SMichael Halcrow } 215237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 216b59db43aSTyler Hicks rc = ecryptfs_new_file_context(ecryptfs_inode); 217237fead6SMichael Halcrow if (rc) { 218d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 219d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 220d7cdc5feSMichael Halcrow goto out; 221237fead6SMichael Halcrow } 222b59db43aSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); 223391b52f9SMichael Halcrow if (rc) { 224391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 225332ab16fSTyler Hicks "the lower file for the dentry with name " 226391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 227391b52f9SMichael Halcrow ecryptfs_dentry->d_name.name, rc); 228391b52f9SMichael Halcrow goto out; 229391b52f9SMichael Halcrow } 230b59db43aSTyler Hicks rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); 231332ab16fSTyler Hicks if (rc) 232d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 233b59db43aSTyler Hicks ecryptfs_put_lower_file(ecryptfs_inode); 234237fead6SMichael Halcrow out: 235237fead6SMichael Halcrow return rc; 236237fead6SMichael Halcrow } 237237fead6SMichael Halcrow 238237fead6SMichael Halcrow /** 239237fead6SMichael Halcrow * ecryptfs_create 240237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 241237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 242237fead6SMichael Halcrow * @mode: The mode of the new file. 243237fead6SMichael Halcrow * @nd: nameidata 244237fead6SMichael Halcrow * 245237fead6SMichael Halcrow * Creates a new file. 246237fead6SMichael Halcrow * 247237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 248237fead6SMichael Halcrow */ 249237fead6SMichael Halcrow static int 250237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 2514acdaf27SAl Viro umode_t mode, struct nameidata *nd) 252237fead6SMichael Halcrow { 253b59db43aSTyler Hicks struct inode *ecryptfs_inode; 254237fead6SMichael Halcrow int rc; 255237fead6SMichael Halcrow 256b59db43aSTyler Hicks ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, 257b59db43aSTyler Hicks mode); 258b59db43aSTyler Hicks if (unlikely(IS_ERR(ecryptfs_inode))) { 259237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 260237fead6SMichael Halcrow "lower filesystem\n"); 261b59db43aSTyler Hicks rc = PTR_ERR(ecryptfs_inode); 262237fead6SMichael Halcrow goto out; 263237fead6SMichael Halcrow } 264237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 265237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 266b59db43aSTyler Hicks rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); 267b59db43aSTyler Hicks if (rc) { 268b59db43aSTyler Hicks drop_nlink(ecryptfs_inode); 269b59db43aSTyler Hicks unlock_new_inode(ecryptfs_inode); 270b59db43aSTyler Hicks iput(ecryptfs_inode); 271b59db43aSTyler Hicks goto out; 272b59db43aSTyler Hicks } 273b59db43aSTyler Hicks d_instantiate(ecryptfs_dentry, ecryptfs_inode); 274b59db43aSTyler Hicks unlock_new_inode(ecryptfs_inode); 275237fead6SMichael Halcrow out: 276237fead6SMichael Halcrow return rc; 277237fead6SMichael Halcrow } 278237fead6SMichael Halcrow 279778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 280237fead6SMichael Halcrow { 2812aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 282778aeb42STyler Hicks int rc; 283237fead6SMichael Halcrow 284778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 285391b52f9SMichael Halcrow if (rc) { 286391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 287332ab16fSTyler Hicks "the lower file for the dentry with name " 288391b52f9SMichael Halcrow "[%s]; rc = [%d]\n", __func__, 289778aeb42STyler Hicks dentry->d_name.name, rc); 290778aeb42STyler Hicks return rc; 291391b52f9SMichael Halcrow } 292778aeb42STyler Hicks 2933b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 2942aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 2952aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 2962aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 297778aeb42STyler Hicks 298778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 299778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 300237fead6SMichael Halcrow if (rc) { 301778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 302778aeb42STyler Hicks if (!rc) 303dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 304dd2a3b7aSMichael Halcrow } 305778aeb42STyler Hicks 306778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 307778aeb42STyler Hicks return 0; 308778aeb42STyler Hicks } 309778aeb42STyler Hicks 310778aeb42STyler Hicks /** 311778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 312778aeb42STyler Hicks */ 313778aeb42STyler Hicks static int ecryptfs_lookup_interpose(struct dentry *dentry, 314778aeb42STyler Hicks struct dentry *lower_dentry, 315778aeb42STyler Hicks struct inode *dir_inode) 316778aeb42STyler Hicks { 317778aeb42STyler Hicks struct inode *inode, *lower_inode = lower_dentry->d_inode; 318778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 319778aeb42STyler Hicks struct vfsmount *lower_mnt; 320778aeb42STyler Hicks int rc = 0; 321778aeb42STyler Hicks 322778aeb42STyler Hicks lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 323778aeb42STyler Hicks fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode); 324778aeb42STyler Hicks BUG_ON(!lower_dentry->d_count); 325778aeb42STyler Hicks 326778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 327778aeb42STyler Hicks ecryptfs_set_dentry_private(dentry, dentry_info); 328778aeb42STyler Hicks if (!dentry_info) { 329778aeb42STyler Hicks printk(KERN_ERR "%s: Out of memory whilst attempting " 330778aeb42STyler Hicks "to allocate ecryptfs_dentry_info struct\n", 331778aeb42STyler Hicks __func__); 332237fead6SMichael Halcrow dput(lower_dentry); 33331f73beeSLino Sanfilippo mntput(lower_mnt); 334778aeb42STyler Hicks d_drop(dentry); 335778aeb42STyler Hicks return -ENOMEM; 336778aeb42STyler Hicks } 337778aeb42STyler Hicks ecryptfs_set_dentry_lower(dentry, lower_dentry); 338778aeb42STyler Hicks ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); 339778aeb42STyler Hicks 340778aeb42STyler Hicks if (!lower_dentry->d_inode) { 341778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 342778aeb42STyler Hicks d_add(dentry, NULL); 343778aeb42STyler Hicks return 0; 344778aeb42STyler Hicks } 345778aeb42STyler Hicks inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); 346778aeb42STyler Hicks if (IS_ERR(inode)) { 347778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 348778aeb42STyler Hicks __func__, PTR_ERR(inode)); 349778aeb42STyler Hicks return PTR_ERR(inode); 350778aeb42STyler Hicks } 351778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 352778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 353778aeb42STyler Hicks if (rc) { 354778aeb42STyler Hicks make_bad_inode(inode); 355778aeb42STyler Hicks return rc; 356778aeb42STyler Hicks } 357778aeb42STyler Hicks } 358778aeb42STyler Hicks 359778aeb42STyler Hicks if (inode->i_state & I_NEW) 360778aeb42STyler Hicks unlock_new_inode(inode); 361778aeb42STyler Hicks d_add(dentry, inode); 362778aeb42STyler Hicks 363addd65adSMichael Halcrow return rc; 364addd65adSMichael Halcrow } 365addd65adSMichael Halcrow 366addd65adSMichael Halcrow /** 367addd65adSMichael Halcrow * ecryptfs_lookup 368addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 369addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 370addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 371addd65adSMichael Halcrow * 372addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 373addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 374addd65adSMichael Halcrow */ 375addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 376addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 37700cd8dd3SAl Viro unsigned int flags) 378addd65adSMichael Halcrow { 379addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 380a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 381addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 382addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 383addd65adSMichael Halcrow int rc = 0; 384addd65adSMichael Halcrow 385addd65adSMichael Halcrow if ((ecryptfs_dentry->d_name.len == 1 386addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".")) 387addd65adSMichael Halcrow || (ecryptfs_dentry->d_name.len == 2 388addd65adSMichael Halcrow && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { 389addd65adSMichael Halcrow goto out_d_drop; 390addd65adSMichael Halcrow } 391addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 3928787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 3938787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 3948787c7a3STyler Hicks lower_dir_dentry, 3958787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 3968787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 397addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 398addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 3998787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4009f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 4019f37622fSTyler Hicks encrypted_and_encoded_name); 402addd65adSMichael Halcrow goto out_d_drop; 403addd65adSMichael Halcrow } 404addd65adSMichael Halcrow if (lower_dentry->d_inode) 4055ccf9203STyler Hicks goto interpose; 406addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 407addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 4082aac0cf8STyler Hicks if (!(mount_crypt_stat 4092aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 4105ccf9203STyler Hicks goto interpose; 411addd65adSMichael Halcrow dput(lower_dentry); 412addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 413addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 4142aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 415addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 416addd65adSMichael Halcrow if (rc) { 417addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 418addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 419addd65adSMichael Halcrow goto out_d_drop; 420addd65adSMichael Halcrow } 4218787c7a3STyler Hicks mutex_lock(&lower_dir_dentry->d_inode->i_mutex); 4228787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 4238787c7a3STyler Hicks lower_dir_dentry, 4248787c7a3STyler Hicks encrypted_and_encoded_name_size); 4258787c7a3STyler Hicks mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); 426addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 427addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4288787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4299f37622fSTyler Hicks "[%d] on lower_dentry = [%s]\n", __func__, rc, 430addd65adSMichael Halcrow encrypted_and_encoded_name); 431addd65adSMichael Halcrow goto out_d_drop; 432addd65adSMichael Halcrow } 4335ccf9203STyler Hicks interpose: 4345ccf9203STyler Hicks rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, 43570b89021STyler Hicks ecryptfs_dir_inode); 436addd65adSMichael Halcrow goto out; 437addd65adSMichael Halcrow out_d_drop: 438addd65adSMichael Halcrow d_drop(ecryptfs_dentry); 439addd65adSMichael Halcrow out: 440addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 441237fead6SMichael Halcrow return ERR_PTR(rc); 442237fead6SMichael Halcrow } 443237fead6SMichael Halcrow 444237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 445237fead6SMichael Halcrow struct dentry *new_dentry) 446237fead6SMichael Halcrow { 447237fead6SMichael Halcrow struct dentry *lower_old_dentry; 448237fead6SMichael Halcrow struct dentry *lower_new_dentry; 449237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 450237fead6SMichael Halcrow u64 file_size_save; 451237fead6SMichael Halcrow int rc; 452237fead6SMichael Halcrow 453237fead6SMichael Halcrow file_size_save = i_size_read(old_dentry->d_inode); 454237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 455237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 456237fead6SMichael Halcrow dget(lower_old_dentry); 457237fead6SMichael Halcrow dget(lower_new_dentry); 458237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 459237fead6SMichael Halcrow rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, 460237fead6SMichael Halcrow lower_new_dentry); 461237fead6SMichael Halcrow if (rc || !lower_new_dentry->d_inode) 462237fead6SMichael Halcrow goto out_lock; 4635ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 464237fead6SMichael Halcrow if (rc) 465237fead6SMichael Halcrow goto out_lock; 4663a8380c0STyler Hicks fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 4673a8380c0STyler Hicks fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 468bfe86848SMiklos Szeredi set_nlink(old_dentry->d_inode, 469bfe86848SMiklos Szeredi ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink); 470237fead6SMichael Halcrow i_size_write(new_dentry->d_inode, file_size_save); 471237fead6SMichael Halcrow out_lock: 472237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 473237fead6SMichael Halcrow dput(lower_new_dentry); 474237fead6SMichael Halcrow dput(lower_old_dentry); 475237fead6SMichael Halcrow return rc; 476237fead6SMichael Halcrow } 477237fead6SMichael Halcrow 478237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 479237fead6SMichael Halcrow { 480237fead6SMichael Halcrow int rc = 0; 481237fead6SMichael Halcrow struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 482237fead6SMichael Halcrow struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 4838dc4e373SMiklos Szeredi struct dentry *lower_dir_dentry; 484237fead6SMichael Halcrow 4859c2d2056STyler Hicks dget(lower_dentry); 4868dc4e373SMiklos Szeredi lower_dir_dentry = lock_parent(lower_dentry); 487237fead6SMichael Halcrow rc = vfs_unlink(lower_dir_inode, lower_dentry); 488237fead6SMichael Halcrow if (rc) { 489ae56fb16SMichael Halcrow printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 490237fead6SMichael Halcrow goto out_unlock; 491237fead6SMichael Halcrow } 4920cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_inode); 493bfe86848SMiklos Szeredi set_nlink(dentry->d_inode, 494bfe86848SMiklos Szeredi ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink); 495237fead6SMichael Halcrow dentry->d_inode->i_ctime = dir->i_ctime; 496caeeeecfSMichael Halcrow d_drop(dentry); 497237fead6SMichael Halcrow out_unlock: 4988dc4e373SMiklos Szeredi unlock_dir(lower_dir_dentry); 4999c2d2056STyler Hicks dput(lower_dentry); 500237fead6SMichael Halcrow return rc; 501237fead6SMichael Halcrow } 502237fead6SMichael Halcrow 503237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 504237fead6SMichael Halcrow const char *symname) 505237fead6SMichael Halcrow { 506237fead6SMichael Halcrow int rc; 507237fead6SMichael Halcrow struct dentry *lower_dentry; 508237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 509237fead6SMichael Halcrow char *encoded_symname; 510addd65adSMichael Halcrow size_t encoded_symlen; 511addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 512237fead6SMichael Halcrow 513237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 514237fead6SMichael Halcrow dget(lower_dentry); 515237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 516addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 517addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 518addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 519addd65adSMichael Halcrow &encoded_symlen, 520addd65adSMichael Halcrow NULL, 521addd65adSMichael Halcrow mount_crypt_stat, symname, 522addd65adSMichael Halcrow strlen(symname)); 523addd65adSMichael Halcrow if (rc) 524237fead6SMichael Halcrow goto out_lock; 525237fead6SMichael Halcrow rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, 526db2e747bSMiklos Szeredi encoded_symname); 527237fead6SMichael Halcrow kfree(encoded_symname); 528237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 529237fead6SMichael Halcrow goto out_lock; 5305ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 531237fead6SMichael Halcrow if (rc) 532237fead6SMichael Halcrow goto out_lock; 5330cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5340cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 535237fead6SMichael Halcrow out_lock: 536237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 537237fead6SMichael Halcrow dput(lower_dentry); 538237fead6SMichael Halcrow if (!dentry->d_inode) 539237fead6SMichael Halcrow d_drop(dentry); 540237fead6SMichael Halcrow return rc; 541237fead6SMichael Halcrow } 542237fead6SMichael Halcrow 54318bb1db3SAl Viro static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 544237fead6SMichael Halcrow { 545237fead6SMichael Halcrow int rc; 546237fead6SMichael Halcrow struct dentry *lower_dentry; 547237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 548237fead6SMichael Halcrow 549237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 550237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 551237fead6SMichael Halcrow rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); 552237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 553237fead6SMichael Halcrow goto out; 5545ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 555237fead6SMichael Halcrow if (rc) 556237fead6SMichael Halcrow goto out; 5570cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 5580cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 559bfe86848SMiklos Szeredi set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); 560237fead6SMichael Halcrow out: 561237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 562237fead6SMichael Halcrow if (!dentry->d_inode) 563237fead6SMichael Halcrow d_drop(dentry); 564237fead6SMichael Halcrow return rc; 565237fead6SMichael Halcrow } 566237fead6SMichael Halcrow 567237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 568237fead6SMichael Halcrow { 569237fead6SMichael Halcrow struct dentry *lower_dentry; 570237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 57145ec4abaSMichael Halcrow int rc; 572237fead6SMichael Halcrow 573237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 57445ec4abaSMichael Halcrow dget(dentry); 575237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 57645ec4abaSMichael Halcrow dget(lower_dentry); 577237fead6SMichael Halcrow rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); 57845ec4abaSMichael Halcrow dput(lower_dentry); 57907850552STyler Hicks if (!rc && dentry->d_inode) 58007850552STyler Hicks clear_nlink(dentry->d_inode); 5810cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 582bfe86848SMiklos Szeredi set_nlink(dir, lower_dir_dentry->d_inode->i_nlink); 583237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 584237fead6SMichael Halcrow if (!rc) 585237fead6SMichael Halcrow d_drop(dentry); 58645ec4abaSMichael Halcrow dput(dentry); 587237fead6SMichael Halcrow return rc; 588237fead6SMichael Halcrow } 589237fead6SMichael Halcrow 590237fead6SMichael Halcrow static int 5911a67aafbSAl Viro ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) 592237fead6SMichael Halcrow { 593237fead6SMichael Halcrow int rc; 594237fead6SMichael Halcrow struct dentry *lower_dentry; 595237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 596237fead6SMichael Halcrow 597237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 598237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 599237fead6SMichael Halcrow rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); 600237fead6SMichael Halcrow if (rc || !lower_dentry->d_inode) 601237fead6SMichael Halcrow goto out; 6025ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 603237fead6SMichael Halcrow if (rc) 604237fead6SMichael Halcrow goto out; 6050cc72dc7SJosef "Jeff" Sipek fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); 6060cc72dc7SJosef "Jeff" Sipek fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); 607237fead6SMichael Halcrow out: 608237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 609237fead6SMichael Halcrow if (!dentry->d_inode) 610237fead6SMichael Halcrow d_drop(dentry); 611237fead6SMichael Halcrow return rc; 612237fead6SMichael Halcrow } 613237fead6SMichael Halcrow 614237fead6SMichael Halcrow static int 615237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 616237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 617237fead6SMichael Halcrow { 618237fead6SMichael Halcrow int rc; 619237fead6SMichael Halcrow struct dentry *lower_old_dentry; 620237fead6SMichael Halcrow struct dentry *lower_new_dentry; 621237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 622237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6230d132f73SErez Zadok struct dentry *trap = NULL; 624237fead6SMichael Halcrow 625237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 626237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 627237fead6SMichael Halcrow dget(lower_old_dentry); 628237fead6SMichael Halcrow dget(lower_new_dentry); 629237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 630237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6310d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6320d132f73SErez Zadok /* source should not be ancestor of target */ 6330d132f73SErez Zadok if (trap == lower_old_dentry) { 6340d132f73SErez Zadok rc = -EINVAL; 6350d132f73SErez Zadok goto out_lock; 6360d132f73SErez Zadok } 6370d132f73SErez Zadok /* target should not be ancestor of source */ 6380d132f73SErez Zadok if (trap == lower_new_dentry) { 6390d132f73SErez Zadok rc = -ENOTEMPTY; 6400d132f73SErez Zadok goto out_lock; 6410d132f73SErez Zadok } 642237fead6SMichael Halcrow rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, 643237fead6SMichael Halcrow lower_new_dir_dentry->d_inode, lower_new_dentry); 644237fead6SMichael Halcrow if (rc) 645237fead6SMichael Halcrow goto out_lock; 6469afa2fb6SErez Zadok fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); 647237fead6SMichael Halcrow if (new_dir != old_dir) 6489afa2fb6SErez Zadok fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); 649237fead6SMichael Halcrow out_lock: 650237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 651dd55c898STyler Hicks dput(lower_new_dir_dentry); 652dd55c898STyler Hicks dput(lower_old_dir_dentry); 653237fead6SMichael Halcrow dput(lower_new_dentry); 654237fead6SMichael Halcrow dput(lower_old_dentry); 655237fead6SMichael Halcrow return rc; 656237fead6SMichael Halcrow } 657237fead6SMichael Halcrow 6583a60a168STyler Hicks static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, 6593a60a168STyler Hicks size_t *bufsiz) 660237fead6SMichael Halcrow { 6613a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 662237fead6SMichael Halcrow char *lower_buf; 663addd65adSMichael Halcrow mm_segment_t old_fs; 664addd65adSMichael Halcrow int rc; 665237fead6SMichael Halcrow 666408bd629SAl Viro lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); 6673a60a168STyler Hicks if (!lower_buf) { 668237fead6SMichael Halcrow rc = -ENOMEM; 669237fead6SMichael Halcrow goto out; 670237fead6SMichael Halcrow } 671237fead6SMichael Halcrow old_fs = get_fs(); 672237fead6SMichael Halcrow set_fs(get_ds()); 673237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, 674237fead6SMichael Halcrow (char __user *)lower_buf, 675408bd629SAl Viro PATH_MAX); 676237fead6SMichael Halcrow set_fs(old_fs); 6773a60a168STyler Hicks if (rc < 0) 6783a60a168STyler Hicks goto out; 6793a60a168STyler Hicks rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, 680408bd629SAl Viro lower_buf, rc); 6813a60a168STyler Hicks out: 682237fead6SMichael Halcrow kfree(lower_buf); 6833a60a168STyler Hicks return rc; 6843a60a168STyler Hicks } 6853a60a168STyler Hicks 686237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 687237fead6SMichael Halcrow { 688237fead6SMichael Halcrow char *buf; 689408bd629SAl Viro size_t len = PATH_MAX; 690408bd629SAl Viro int rc; 691237fead6SMichael Halcrow 692408bd629SAl Viro rc = ecryptfs_readlink_lower(dentry, &buf, &len); 693408bd629SAl Viro if (rc) 694237fead6SMichael Halcrow goto out; 695408bd629SAl Viro fsstack_copy_attr_atime(dentry->d_inode, 696408bd629SAl Viro ecryptfs_dentry_to_lower(dentry)->d_inode); 697408bd629SAl Viro buf[len] = '\0'; 698237fead6SMichael Halcrow out: 699806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 700806892e9SOGAWA Hirofumi return NULL; 701237fead6SMichael Halcrow } 702237fead6SMichael Halcrow 703237fead6SMichael Halcrow static void 704237fead6SMichael Halcrow ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) 705237fead6SMichael Halcrow { 706806892e9SOGAWA Hirofumi char *buf = nd_get_link(nd); 707806892e9SOGAWA Hirofumi if (!IS_ERR(buf)) { 708237fead6SMichael Halcrow /* Free the char* */ 709806892e9SOGAWA Hirofumi kfree(buf); 710806892e9SOGAWA Hirofumi } 711237fead6SMichael Halcrow } 712237fead6SMichael Halcrow 713237fead6SMichael Halcrow /** 714237fead6SMichael Halcrow * upper_size_to_lower_size 715237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 716237fead6SMichael Halcrow * @upper_size: Size of the upper file 717237fead6SMichael Halcrow * 718cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 719237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 720237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 721237fead6SMichael Halcrow * 722237fead6SMichael Halcrow * Returns Calculated size of the lower file. 723237fead6SMichael Halcrow */ 724237fead6SMichael Halcrow static loff_t 725237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 726237fead6SMichael Halcrow loff_t upper_size) 727237fead6SMichael Halcrow { 728237fead6SMichael Halcrow loff_t lower_size; 729237fead6SMichael Halcrow 730157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 731237fead6SMichael Halcrow if (upper_size != 0) { 732237fead6SMichael Halcrow loff_t num_extents; 733237fead6SMichael Halcrow 734237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 735237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 736237fead6SMichael Halcrow num_extents++; 737237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 738237fead6SMichael Halcrow } 739237fead6SMichael Halcrow return lower_size; 740237fead6SMichael Halcrow } 741237fead6SMichael Halcrow 742237fead6SMichael Halcrow /** 7435f3ef64fSTyler Hicks * truncate_upper 744237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7455f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7465f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 747237fead6SMichael Halcrow * 748237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 749237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7505f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7515f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7525f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7535f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7545f3ef64fSTyler Hicks * the truncation of the lower inode. 755237fead6SMichael Halcrow * 756237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 757237fead6SMichael Halcrow */ 7585f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7595f3ef64fSTyler Hicks struct iattr *lower_ia) 760237fead6SMichael Halcrow { 761237fead6SMichael Halcrow int rc = 0; 762237fead6SMichael Halcrow struct inode *inode = dentry->d_inode; 763237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 764237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 765237fead6SMichael Halcrow loff_t lower_size_before_truncate; 766237fead6SMichael Halcrow loff_t lower_size_after_truncate; 767237fead6SMichael Halcrow 7685f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7695f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 770332ab16fSTyler Hicks return 0; 7715f3ef64fSTyler Hicks } 7723b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 773332ab16fSTyler Hicks if (rc) 774332ab16fSTyler Hicks return rc; 775237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 776237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7775f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7782ed92554SMichael Halcrow char zero[] = { 0x00 }; 779240e2df5SMichael Halcrow 7805f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7812ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7822ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7832ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7842ed92554SMichael Halcrow * file and the new and of the file */ 78548c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7865f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7875f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7885f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7895f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 7905f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 7912ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 7922ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 7935f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 7942ed92554SMichael Halcrow 7952c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7962c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7975f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7985f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 79948c1e44aSAl Viro goto out; 80013a791b4STyler Hicks } 8012ed92554SMichael Halcrow if (num_zeros) { 8022ed92554SMichael Halcrow char *zeros_virt; 8032ed92554SMichael Halcrow 8042ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 8052ed92554SMichael Halcrow if (!zeros_virt) { 8062ed92554SMichael Halcrow rc = -ENOMEM; 80748c1e44aSAl Viro goto out; 808240e2df5SMichael Halcrow } 80948c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 8105f3ef64fSTyler Hicks ia->ia_size, num_zeros); 8112ed92554SMichael Halcrow kfree(zeros_virt); 8125dda6992SMichael Halcrow if (rc) { 813240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 814240e2df5SMichael Halcrow "the remainder of the end page on " 815240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 81648c1e44aSAl Viro goto out; 817240e2df5SMichael Halcrow } 818240e2df5SMichael Halcrow } 8192c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 8200216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 821dd2a3b7aSMichael Halcrow if (rc) { 822dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 823dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 824dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 82548c1e44aSAl Viro goto out; 826dd2a3b7aSMichael Halcrow } 827237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 828237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 829237fead6SMichael Halcrow lower_size_before_truncate = 830237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 831237fead6SMichael Halcrow lower_size_after_truncate = 8325f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8335f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8345f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8355f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8365f3ef64fSTyler Hicks } else 8375f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 838237fead6SMichael Halcrow } 839237fead6SMichael Halcrow out: 840332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 841237fead6SMichael Halcrow return rc; 842237fead6SMichael Halcrow } 843237fead6SMichael Halcrow 844a261a039STyler Hicks static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) 845a261a039STyler Hicks { 846a261a039STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 847a261a039STyler Hicks loff_t lower_oldsize, lower_newsize; 848a261a039STyler Hicks 849a261a039STyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 850a261a039STyler Hicks lower_oldsize = upper_size_to_lower_size(crypt_stat, 851a261a039STyler Hicks i_size_read(inode)); 852a261a039STyler Hicks lower_newsize = upper_size_to_lower_size(crypt_stat, offset); 853a261a039STyler Hicks if (lower_newsize > lower_oldsize) { 854a261a039STyler Hicks /* 855a261a039STyler Hicks * The eCryptfs inode and the new *lower* size are mixed here 856a261a039STyler Hicks * because we may not have the lower i_mutex held and/or it may 857a261a039STyler Hicks * not be appropriate to call inode_newsize_ok() with inodes 858a261a039STyler Hicks * from other filesystems. 859a261a039STyler Hicks */ 860a261a039STyler Hicks return inode_newsize_ok(inode, lower_newsize); 861a261a039STyler Hicks } 862a261a039STyler Hicks 863a261a039STyler Hicks return 0; 864a261a039STyler Hicks } 865a261a039STyler Hicks 8665f3ef64fSTyler Hicks /** 8675f3ef64fSTyler Hicks * ecryptfs_truncate 8685f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8695f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8705f3ef64fSTyler Hicks * 8715f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8725f3ef64fSTyler Hicks * its corresponding lower inode. 8735f3ef64fSTyler Hicks * 8745f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8755f3ef64fSTyler Hicks */ 8765f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8775f3ef64fSTyler Hicks { 8785f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8795f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8805f3ef64fSTyler Hicks int rc; 8815f3ef64fSTyler Hicks 882a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(dentry->d_inode, new_length); 883a261a039STyler Hicks if (rc) 884a261a039STyler Hicks return rc; 885a261a039STyler Hicks 8865f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8875f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8885f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8895f3ef64fSTyler Hicks 8905f3ef64fSTyler Hicks mutex_lock(&lower_dentry->d_inode->i_mutex); 8915f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 8925f3ef64fSTyler Hicks mutex_unlock(&lower_dentry->d_inode->i_mutex); 8935f3ef64fSTyler Hicks } 8945f3ef64fSTyler Hicks return rc; 8955f3ef64fSTyler Hicks } 8965f3ef64fSTyler Hicks 897237fead6SMichael Halcrow static int 89810556cb2SAl Viro ecryptfs_permission(struct inode *inode, int mask) 899237fead6SMichael Halcrow { 900f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 901237fead6SMichael Halcrow } 902237fead6SMichael Halcrow 903237fead6SMichael Halcrow /** 904237fead6SMichael Halcrow * ecryptfs_setattr 905237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 906237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 907237fead6SMichael Halcrow * 908237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 909237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 910237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 911237fead6SMichael Halcrow * 912237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 913237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 914237fead6SMichael Halcrow */ 915237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 916237fead6SMichael Halcrow { 917237fead6SMichael Halcrow int rc = 0; 918237fead6SMichael Halcrow struct dentry *lower_dentry; 9195f3ef64fSTyler Hicks struct iattr lower_ia; 920237fead6SMichael Halcrow struct inode *inode; 921237fead6SMichael Halcrow struct inode *lower_inode; 922237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 923237fead6SMichael Halcrow 924237fead6SMichael Halcrow crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; 925e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 926e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 927237fead6SMichael Halcrow inode = dentry->d_inode; 928237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 929e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 930e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 931e10f281bSMichael Halcrow if (S_ISDIR(dentry->d_inode->i_mode)) 932e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 93364ee4808SMichael Halcrow else if (S_ISREG(dentry->d_inode->i_mode) 93464ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 93564ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 936e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 937e10f281bSMichael Halcrow 938e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 939e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9403b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 941332ab16fSTyler Hicks if (rc) { 942332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 943332ab16fSTyler Hicks goto out; 944332ab16fSTyler Hicks } 945d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 946332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9475dda6992SMichael Halcrow if (rc) { 948e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 949e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 950e10f281bSMichael Halcrow rc = -EIO; 95125bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 952e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 95325bd8174SMichael Halcrow "or the key could not be retrieved. " 95425bd8174SMichael Halcrow "Plaintext passthrough mode is not " 955e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 956e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 957e10f281bSMichael Halcrow goto out; 958e10f281bSMichael Halcrow } 959e10f281bSMichael Halcrow rc = 0; 9603aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9613aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 962e10f281bSMichael Halcrow } 963e10f281bSMichael Halcrow } 964e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 965a261a039STyler Hicks 966a261a039STyler Hicks rc = inode_change_ok(inode, ia); 967a261a039STyler Hicks if (rc) 968a261a039STyler Hicks goto out; 969a261a039STyler Hicks if (ia->ia_valid & ATTR_SIZE) { 970a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); 971a261a039STyler Hicks if (rc) 972a261a039STyler Hicks goto out; 973a261a039STyler Hicks } 974a261a039STyler Hicks 9755be79de2STyler Hicks if (S_ISREG(inode->i_mode)) { 9765be79de2STyler Hicks rc = filemap_write_and_wait(inode->i_mapping); 9775be79de2STyler Hicks if (rc) 9785be79de2STyler Hicks goto out; 9795be79de2STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 9805be79de2STyler Hicks } 9815f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9825f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9835f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 984237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9855f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 986237fead6SMichael Halcrow if (rc < 0) 987237fead6SMichael Halcrow goto out; 988237fead6SMichael Halcrow } 9891ac564ecSJeff Layton 9901ac564ecSJeff Layton /* 9911ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9921ac564ecSJeff Layton * to interpret this in its own way. 9931ac564ecSJeff Layton */ 9945f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9955f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9961ac564ecSJeff Layton 9979c3580aaSMiklos Szeredi mutex_lock(&lower_dentry->d_inode->i_mutex); 9985f3ef64fSTyler Hicks rc = notify_change(lower_dentry, &lower_ia); 9999c3580aaSMiklos Szeredi mutex_unlock(&lower_dentry->d_inode->i_mutex); 1000237fead6SMichael Halcrow out: 10019afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 1002237fead6SMichael Halcrow return rc; 1003237fead6SMichael Halcrow } 1004237fead6SMichael Halcrow 10053a60a168STyler Hicks int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 10063a60a168STyler Hicks struct kstat *stat) 10073a60a168STyler Hicks { 10083a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 10093a60a168STyler Hicks int rc = 0; 10103a60a168STyler Hicks 10113a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 10123a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 10133a60a168STyler Hicks generic_fillattr(dentry->d_inode, stat); 10143a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 10153a60a168STyler Hicks char *target; 10163a60a168STyler Hicks size_t targetsiz; 10173a60a168STyler Hicks 10183a60a168STyler Hicks rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); 10193a60a168STyler Hicks if (!rc) { 10203a60a168STyler Hicks kfree(target); 10213a60a168STyler Hicks stat->size = targetsiz; 10223a60a168STyler Hicks } 10233a60a168STyler Hicks } 10243a60a168STyler Hicks return rc; 10253a60a168STyler Hicks } 10263a60a168STyler Hicks 1027f8f484d1STyler Hicks int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1028f8f484d1STyler Hicks struct kstat *stat) 1029f8f484d1STyler Hicks { 1030f8f484d1STyler Hicks struct kstat lower_stat; 1031f8f484d1STyler Hicks int rc; 1032f8f484d1STyler Hicks 1033f8f484d1STyler Hicks rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), 1034f8f484d1STyler Hicks ecryptfs_dentry_to_lower(dentry), &lower_stat); 1035f8f484d1STyler Hicks if (!rc) { 103655f9cf6bSTyler Hicks fsstack_copy_attr_all(dentry->d_inode, 103755f9cf6bSTyler Hicks ecryptfs_inode_to_lower(dentry->d_inode)); 1038f8f484d1STyler Hicks generic_fillattr(dentry->d_inode, stat); 1039f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1040f8f484d1STyler Hicks } 1041f8f484d1STyler Hicks return rc; 1042f8f484d1STyler Hicks } 1043f8f484d1STyler Hicks 1044dd2a3b7aSMichael Halcrow int 1045237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1046237fead6SMichael Halcrow size_t size, int flags) 1047237fead6SMichael Halcrow { 1048237fead6SMichael Halcrow int rc = 0; 1049237fead6SMichael Halcrow struct dentry *lower_dentry; 1050237fead6SMichael Halcrow 1051237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1052237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->setxattr) { 1053cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1054237fead6SMichael Halcrow goto out; 1055237fead6SMichael Halcrow } 105648b512e6SRoberto Sassu 105748b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 1058545d6809STyler Hicks if (!rc) 1059545d6809STyler Hicks fsstack_copy_attr_all(dentry->d_inode, lower_dentry->d_inode); 1060237fead6SMichael Halcrow out: 1061237fead6SMichael Halcrow return rc; 1062237fead6SMichael Halcrow } 1063237fead6SMichael Halcrow 1064dd2a3b7aSMichael Halcrow ssize_t 1065d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1066d7cdc5feSMichael Halcrow void *value, size_t size) 1067d7cdc5feSMichael Halcrow { 1068d7cdc5feSMichael Halcrow int rc = 0; 1069d7cdc5feSMichael Halcrow 1070d7cdc5feSMichael Halcrow if (!lower_dentry->d_inode->i_op->getxattr) { 1071cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1072d7cdc5feSMichael Halcrow goto out; 1073d7cdc5feSMichael Halcrow } 1074d7cdc5feSMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1075d7cdc5feSMichael Halcrow rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, 1076d7cdc5feSMichael Halcrow size); 1077d7cdc5feSMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1078d7cdc5feSMichael Halcrow out: 1079d7cdc5feSMichael Halcrow return rc; 1080d7cdc5feSMichael Halcrow } 1081d7cdc5feSMichael Halcrow 10827896b631SAdrian Bunk static ssize_t 1083237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1084237fead6SMichael Halcrow size_t size) 1085237fead6SMichael Halcrow { 10862ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 10872ed92554SMichael Halcrow value, size); 1088237fead6SMichael Halcrow } 1089237fead6SMichael Halcrow 1090237fead6SMichael Halcrow static ssize_t 1091237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1092237fead6SMichael Halcrow { 1093237fead6SMichael Halcrow int rc = 0; 1094237fead6SMichael Halcrow struct dentry *lower_dentry; 1095237fead6SMichael Halcrow 1096237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1097237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->listxattr) { 1098cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1099237fead6SMichael Halcrow goto out; 1100237fead6SMichael Halcrow } 1101237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1102237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); 1103237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1104237fead6SMichael Halcrow out: 1105237fead6SMichael Halcrow return rc; 1106237fead6SMichael Halcrow } 1107237fead6SMichael Halcrow 1108237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1109237fead6SMichael Halcrow { 1110237fead6SMichael Halcrow int rc = 0; 1111237fead6SMichael Halcrow struct dentry *lower_dentry; 1112237fead6SMichael Halcrow 1113237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 1114237fead6SMichael Halcrow if (!lower_dentry->d_inode->i_op->removexattr) { 1115cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1116237fead6SMichael Halcrow goto out; 1117237fead6SMichael Halcrow } 1118237fead6SMichael Halcrow mutex_lock(&lower_dentry->d_inode->i_mutex); 1119237fead6SMichael Halcrow rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); 1120237fead6SMichael Halcrow mutex_unlock(&lower_dentry->d_inode->i_mutex); 1121237fead6SMichael Halcrow out: 1122237fead6SMichael Halcrow return rc; 1123237fead6SMichael Halcrow } 1124237fead6SMichael Halcrow 1125754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1126408bd629SAl Viro .readlink = generic_readlink, 1127237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 1128237fead6SMichael Halcrow .put_link = ecryptfs_put_link, 1129237fead6SMichael Halcrow .permission = ecryptfs_permission, 1130237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11313a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1132237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1133237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1134237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1135237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1136237fead6SMichael Halcrow }; 1137237fead6SMichael Halcrow 1138754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1139237fead6SMichael Halcrow .create = ecryptfs_create, 1140237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1141237fead6SMichael Halcrow .link = ecryptfs_link, 1142237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1143237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1144237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1145237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1146237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1147237fead6SMichael Halcrow .rename = ecryptfs_rename, 1148237fead6SMichael Halcrow .permission = ecryptfs_permission, 1149237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1150237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1151237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1152237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1153237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1154237fead6SMichael Halcrow }; 1155237fead6SMichael Halcrow 1156754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1157237fead6SMichael Halcrow .permission = ecryptfs_permission, 1158237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1159f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1160237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1161237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1162237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1163237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1164237fead6SMichael Halcrow }; 1165