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); 442b0143b5SDavid Howells mutex_lock_nested(&(d_inode(dir)->i_mutex), I_MUTEX_PARENT); 45237fead6SMichael Halcrow return dir; 46237fead6SMichael Halcrow } 47237fead6SMichael Halcrow 48237fead6SMichael Halcrow static void unlock_dir(struct dentry *dir) 49237fead6SMichael Halcrow { 502b0143b5SDavid Howells mutex_unlock(&d_inode(dir)->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 { 56c4cf3ba4SHimangi Saraogi return ecryptfs_inode_to_lower(inode) == lower_inode; 57c4f79073STyler Hicks } 58c4f79073STyler Hicks 595ccf9203STyler Hicks static int ecryptfs_inode_set(struct inode *inode, void *opaque) 60c4f79073STyler Hicks { 615ccf9203STyler Hicks struct inode *lower_inode = opaque; 625ccf9203STyler Hicks 635ccf9203STyler Hicks ecryptfs_set_inode_lower(inode, lower_inode); 645ccf9203STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 655ccf9203STyler Hicks /* i_size will be overwritten for encrypted regular files */ 665ccf9203STyler Hicks fsstack_copy_inode_size(inode, lower_inode); 675ccf9203STyler Hicks inode->i_ino = lower_inode->i_ino; 68c4f79073STyler Hicks inode->i_version++; 69c4f79073STyler Hicks inode->i_mapping->a_ops = &ecryptfs_aops; 705ccf9203STyler Hicks 715ccf9203STyler Hicks if (S_ISLNK(inode->i_mode)) 725ccf9203STyler Hicks inode->i_op = &ecryptfs_symlink_iops; 735ccf9203STyler Hicks else if (S_ISDIR(inode->i_mode)) 745ccf9203STyler Hicks inode->i_op = &ecryptfs_dir_iops; 755ccf9203STyler Hicks else 765ccf9203STyler Hicks inode->i_op = &ecryptfs_main_iops; 775ccf9203STyler Hicks 785ccf9203STyler Hicks if (S_ISDIR(inode->i_mode)) 795ccf9203STyler Hicks inode->i_fop = &ecryptfs_dir_fops; 805ccf9203STyler Hicks else if (special_file(inode->i_mode)) 815ccf9203STyler Hicks init_special_inode(inode, inode->i_mode, inode->i_rdev); 825ccf9203STyler Hicks else 835ccf9203STyler Hicks inode->i_fop = &ecryptfs_main_fops; 845ccf9203STyler Hicks 85c4f79073STyler Hicks return 0; 86c4f79073STyler Hicks } 87c4f79073STyler Hicks 885ccf9203STyler Hicks static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, 895ccf9203STyler Hicks struct super_block *sb) 905ccf9203STyler Hicks { 915ccf9203STyler Hicks struct inode *inode; 925ccf9203STyler Hicks 935ccf9203STyler Hicks if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) 945ccf9203STyler Hicks return ERR_PTR(-EXDEV); 955ccf9203STyler Hicks if (!igrab(lower_inode)) 965ccf9203STyler Hicks return ERR_PTR(-ESTALE); 975ccf9203STyler Hicks inode = iget5_locked(sb, (unsigned long)lower_inode, 985ccf9203STyler Hicks ecryptfs_inode_test, ecryptfs_inode_set, 995ccf9203STyler Hicks lower_inode); 1005ccf9203STyler Hicks if (!inode) { 1015ccf9203STyler Hicks iput(lower_inode); 1025ccf9203STyler Hicks return ERR_PTR(-EACCES); 1035ccf9203STyler Hicks } 1045ccf9203STyler Hicks if (!(inode->i_state & I_NEW)) 1055ccf9203STyler Hicks iput(lower_inode); 1065ccf9203STyler Hicks 1075ccf9203STyler Hicks return inode; 1085ccf9203STyler Hicks } 1095ccf9203STyler Hicks 110c4f79073STyler Hicks struct inode *ecryptfs_get_inode(struct inode *lower_inode, 111c4f79073STyler Hicks struct super_block *sb) 112c4f79073STyler Hicks { 1135ccf9203STyler Hicks struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); 114c4f79073STyler Hicks 1155ccf9203STyler Hicks if (!IS_ERR(inode) && (inode->i_state & I_NEW)) 116c4f79073STyler Hicks unlock_new_inode(inode); 1175ccf9203STyler Hicks 118c4f79073STyler Hicks return inode; 119c4f79073STyler Hicks } 120c4f79073STyler Hicks 121c4f79073STyler Hicks /** 122c4f79073STyler Hicks * ecryptfs_interpose 123c4f79073STyler Hicks * @lower_dentry: Existing dentry in the lower filesystem 124c4f79073STyler Hicks * @dentry: ecryptfs' dentry 125c4f79073STyler Hicks * @sb: ecryptfs's super_block 126c4f79073STyler Hicks * 127c4f79073STyler Hicks * Interposes upper and lower dentries. 128c4f79073STyler Hicks * 129c4f79073STyler Hicks * Returns zero on success; non-zero otherwise 130c4f79073STyler Hicks */ 131c4f79073STyler Hicks static int ecryptfs_interpose(struct dentry *lower_dentry, 1325ccf9203STyler Hicks struct dentry *dentry, struct super_block *sb) 133c4f79073STyler Hicks { 1342b0143b5SDavid Howells struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); 1355ccf9203STyler Hicks 136c4f79073STyler Hicks if (IS_ERR(inode)) 137c4f79073STyler Hicks return PTR_ERR(inode); 138c4f79073STyler Hicks d_instantiate(dentry, inode); 1395ccf9203STyler Hicks 140c4f79073STyler Hicks return 0; 141c4f79073STyler Hicks } 142c4f79073STyler Hicks 1438bc2d3cfSTyler Hicks static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, 1448bc2d3cfSTyler Hicks struct inode *inode) 1458bc2d3cfSTyler Hicks { 1468bc2d3cfSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 1478bc2d3cfSTyler Hicks struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 1488bc2d3cfSTyler Hicks struct dentry *lower_dir_dentry; 1498bc2d3cfSTyler Hicks int rc; 1508bc2d3cfSTyler Hicks 1518bc2d3cfSTyler Hicks dget(lower_dentry); 1528bc2d3cfSTyler Hicks lower_dir_dentry = lock_parent(lower_dentry); 153b21996e3SJ. Bruce Fields rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); 1548bc2d3cfSTyler Hicks if (rc) { 1558bc2d3cfSTyler Hicks printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 1568bc2d3cfSTyler Hicks goto out_unlock; 1578bc2d3cfSTyler Hicks } 1588bc2d3cfSTyler Hicks fsstack_copy_attr_times(dir, lower_dir_inode); 1598bc2d3cfSTyler Hicks set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); 1608bc2d3cfSTyler Hicks inode->i_ctime = dir->i_ctime; 1618bc2d3cfSTyler Hicks d_drop(dentry); 1628bc2d3cfSTyler Hicks out_unlock: 1638bc2d3cfSTyler Hicks unlock_dir(lower_dir_dentry); 1648bc2d3cfSTyler Hicks dput(lower_dentry); 1658bc2d3cfSTyler Hicks return rc; 1668bc2d3cfSTyler Hicks } 1678bc2d3cfSTyler Hicks 168237fead6SMichael Halcrow /** 169237fead6SMichael Halcrow * ecryptfs_do_create 170237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 171237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 172237fead6SMichael Halcrow * @mode: The mode of the new file 173237fead6SMichael Halcrow * @nd: nameidata of ecryptfs' parent's dentry & vfsmount 174237fead6SMichael Halcrow * 175237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 176237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 177237fead6SMichael Halcrow * stat of the lower directory inode. 178237fead6SMichael Halcrow * 179b59db43aSTyler Hicks * Returns the new eCryptfs inode on success; an ERR_PTR on error condition 180237fead6SMichael Halcrow */ 181b59db43aSTyler Hicks static struct inode * 182237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 183175a4eb7SAl Viro struct dentry *ecryptfs_dentry, umode_t mode) 184237fead6SMichael Halcrow { 185237fead6SMichael Halcrow int rc; 186237fead6SMichael Halcrow struct dentry *lower_dentry; 187237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 188b59db43aSTyler Hicks struct inode *inode; 189237fead6SMichael Halcrow 190237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 191237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 1922b0143b5SDavid Howells rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true); 1934981e081SMichael Halcrow if (rc) { 194caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 19518d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 196b59db43aSTyler Hicks inode = ERR_PTR(rc); 197237fead6SMichael Halcrow goto out_lock; 198237fead6SMichael Halcrow } 1992b0143b5SDavid Howells inode = __ecryptfs_get_inode(d_inode(lower_dentry), 2005ccf9203STyler Hicks directory_inode->i_sb); 2018bc2d3cfSTyler Hicks if (IS_ERR(inode)) { 2022b0143b5SDavid Howells vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL); 203237fead6SMichael Halcrow goto out_lock; 2048bc2d3cfSTyler Hicks } 2052b0143b5SDavid Howells fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); 2062b0143b5SDavid Howells fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); 207237fead6SMichael Halcrow out_lock: 208237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 209b59db43aSTyler Hicks return inode; 210237fead6SMichael Halcrow } 211237fead6SMichael Halcrow 212237fead6SMichael Halcrow /** 213237fead6SMichael Halcrow * ecryptfs_initialize_file 214237fead6SMichael Halcrow * 215237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 216237fead6SMichael Halcrow * file with a header and first data page. 217237fead6SMichael Halcrow * 218237fead6SMichael Halcrow * Returns zero on success 219237fead6SMichael Halcrow */ 220e3ccaa97STyler Hicks int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, 221b59db43aSTyler Hicks struct inode *ecryptfs_inode) 222237fead6SMichael Halcrow { 223d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 224b59db43aSTyler Hicks &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; 225237fead6SMichael Halcrow int rc = 0; 226237fead6SMichael Halcrow 227b59db43aSTyler Hicks if (S_ISDIR(ecryptfs_inode->i_mode)) { 228237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 229e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 230d7cdc5feSMichael Halcrow goto out; 231237fead6SMichael Halcrow } 232237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 233b59db43aSTyler Hicks rc = ecryptfs_new_file_context(ecryptfs_inode); 234237fead6SMichael Halcrow if (rc) { 235d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 236d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 237d7cdc5feSMichael Halcrow goto out; 238237fead6SMichael Halcrow } 239b59db43aSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); 240391b52f9SMichael Halcrow if (rc) { 241391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 242332ab16fSTyler Hicks "the lower file for the dentry with name " 2439e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2449e78d14aSDavid Howells ecryptfs_dentry, rc); 245391b52f9SMichael Halcrow goto out; 246391b52f9SMichael Halcrow } 247b59db43aSTyler Hicks rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); 248332ab16fSTyler Hicks if (rc) 249d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 250b59db43aSTyler Hicks ecryptfs_put_lower_file(ecryptfs_inode); 251237fead6SMichael Halcrow out: 252237fead6SMichael Halcrow return rc; 253237fead6SMichael Halcrow } 254237fead6SMichael Halcrow 255237fead6SMichael Halcrow /** 256237fead6SMichael Halcrow * ecryptfs_create 257237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 258237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 259237fead6SMichael Halcrow * @mode: The mode of the new file. 260237fead6SMichael Halcrow * 261237fead6SMichael Halcrow * Creates a new file. 262237fead6SMichael Halcrow * 263237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 264237fead6SMichael Halcrow */ 265237fead6SMichael Halcrow static int 266237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 267ebfc3b49SAl Viro umode_t mode, bool excl) 268237fead6SMichael Halcrow { 269b59db43aSTyler Hicks struct inode *ecryptfs_inode; 270237fead6SMichael Halcrow int rc; 271237fead6SMichael Halcrow 272b59db43aSTyler Hicks ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, 273b59db43aSTyler Hicks mode); 274b59db43aSTyler Hicks if (unlikely(IS_ERR(ecryptfs_inode))) { 275237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 276237fead6SMichael Halcrow "lower filesystem\n"); 277b59db43aSTyler Hicks rc = PTR_ERR(ecryptfs_inode); 278237fead6SMichael Halcrow goto out; 279237fead6SMichael Halcrow } 280237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 281237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 282b59db43aSTyler Hicks rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); 283b59db43aSTyler Hicks if (rc) { 2848bc2d3cfSTyler Hicks ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, 2858bc2d3cfSTyler Hicks ecryptfs_inode); 2868bc2d3cfSTyler Hicks make_bad_inode(ecryptfs_inode); 287b59db43aSTyler Hicks unlock_new_inode(ecryptfs_inode); 288b59db43aSTyler Hicks iput(ecryptfs_inode); 289b59db43aSTyler Hicks goto out; 290b59db43aSTyler Hicks } 291b59db43aSTyler Hicks unlock_new_inode(ecryptfs_inode); 2928fc37ec5SAl Viro d_instantiate(ecryptfs_dentry, ecryptfs_inode); 293237fead6SMichael Halcrow out: 294237fead6SMichael Halcrow return rc; 295237fead6SMichael Halcrow } 296237fead6SMichael Halcrow 297778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 298237fead6SMichael Halcrow { 2992aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 300778aeb42STyler Hicks int rc; 301237fead6SMichael Halcrow 302778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 303391b52f9SMichael Halcrow if (rc) { 304391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 305332ab16fSTyler Hicks "the lower file for the dentry with name " 3069e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 3079e78d14aSDavid Howells dentry, rc); 308778aeb42STyler Hicks return rc; 309391b52f9SMichael Halcrow } 310778aeb42STyler Hicks 3113b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 3122aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3132aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3142aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 315778aeb42STyler Hicks 316778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 317778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 318237fead6SMichael Halcrow if (rc) { 319778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 320778aeb42STyler Hicks if (!rc) 321dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 322dd2a3b7aSMichael Halcrow } 323778aeb42STyler Hicks 324778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 325778aeb42STyler Hicks return 0; 326778aeb42STyler Hicks } 327778aeb42STyler Hicks 328778aeb42STyler Hicks /** 329778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 330778aeb42STyler Hicks */ 331778aeb42STyler Hicks static int ecryptfs_lookup_interpose(struct dentry *dentry, 332778aeb42STyler Hicks struct dentry *lower_dentry, 333778aeb42STyler Hicks struct inode *dir_inode) 334778aeb42STyler Hicks { 3352b0143b5SDavid Howells struct inode *inode, *lower_inode = d_inode(lower_dentry); 336778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 337778aeb42STyler Hicks struct vfsmount *lower_mnt; 338778aeb42STyler Hicks int rc = 0; 339778aeb42STyler Hicks 340778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 341778aeb42STyler Hicks if (!dentry_info) { 342778aeb42STyler Hicks printk(KERN_ERR "%s: Out of memory whilst attempting " 343778aeb42STyler Hicks "to allocate ecryptfs_dentry_info struct\n", 344778aeb42STyler Hicks __func__); 345237fead6SMichael Halcrow dput(lower_dentry); 346778aeb42STyler Hicks return -ENOMEM; 347778aeb42STyler Hicks } 3480b1d9011SAl Viro 3490b1d9011SAl Viro lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 3502b0143b5SDavid Howells fsstack_copy_attr_atime(dir_inode, d_inode(lower_dentry->d_parent)); 35184d08fa8SAl Viro BUG_ON(!d_count(lower_dentry)); 3520b1d9011SAl Viro 3530b1d9011SAl Viro ecryptfs_set_dentry_private(dentry, dentry_info); 35492dd1230SAl Viro dentry_info->lower_path.mnt = lower_mnt; 35592dd1230SAl Viro dentry_info->lower_path.dentry = lower_dentry; 356778aeb42STyler Hicks 3572b0143b5SDavid Howells if (d_really_is_negative(lower_dentry)) { 358778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 359778aeb42STyler Hicks d_add(dentry, NULL); 360778aeb42STyler Hicks return 0; 361778aeb42STyler Hicks } 362778aeb42STyler Hicks inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); 363778aeb42STyler Hicks if (IS_ERR(inode)) { 364778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 365778aeb42STyler Hicks __func__, PTR_ERR(inode)); 366778aeb42STyler Hicks return PTR_ERR(inode); 367778aeb42STyler Hicks } 368778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 369778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 370778aeb42STyler Hicks if (rc) { 371778aeb42STyler Hicks make_bad_inode(inode); 372778aeb42STyler Hicks return rc; 373778aeb42STyler Hicks } 374778aeb42STyler Hicks } 375778aeb42STyler Hicks 376778aeb42STyler Hicks if (inode->i_state & I_NEW) 377778aeb42STyler Hicks unlock_new_inode(inode); 378778aeb42STyler Hicks d_add(dentry, inode); 379778aeb42STyler Hicks 380addd65adSMichael Halcrow return rc; 381addd65adSMichael Halcrow } 382addd65adSMichael Halcrow 383addd65adSMichael Halcrow /** 384addd65adSMichael Halcrow * ecryptfs_lookup 385addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 386addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 387addd65adSMichael Halcrow * @ecryptfs_nd: nameidata; may be NULL 388addd65adSMichael Halcrow * 389addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 390addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 391addd65adSMichael Halcrow */ 392addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 393addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 39400cd8dd3SAl Viro unsigned int flags) 395addd65adSMichael Halcrow { 396addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 397a8f12864SMichael Halcrow size_t encrypted_and_encoded_name_size; 398addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 399addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 400addd65adSMichael Halcrow int rc = 0; 401addd65adSMichael Halcrow 402addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 4032b0143b5SDavid Howells mutex_lock(&d_inode(lower_dir_dentry)->i_mutex); 4048787c7a3STyler Hicks lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, 4058787c7a3STyler Hicks lower_dir_dentry, 4068787c7a3STyler Hicks ecryptfs_dentry->d_name.len); 4072b0143b5SDavid Howells mutex_unlock(&d_inode(lower_dir_dentry)->i_mutex); 408addd65adSMichael Halcrow if (IS_ERR(lower_dentry)) { 409addd65adSMichael Halcrow rc = PTR_ERR(lower_dentry); 4108787c7a3STyler Hicks ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 4119e78d14aSDavid Howells "[%d] on lower_dentry = [%pd]\n", __func__, rc, 4129e78d14aSDavid Howells ecryptfs_dentry); 413bc65a121SAl Viro goto out; 414addd65adSMichael Halcrow } 4152b0143b5SDavid Howells if (d_really_is_positive(lower_dentry)) 4165ccf9203STyler Hicks goto interpose; 417addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 418addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 4192aac0cf8STyler Hicks if (!(mount_crypt_stat 4202aac0cf8STyler Hicks && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) 4215ccf9203STyler Hicks goto interpose; 422addd65adSMichael Halcrow dput(lower_dentry); 423addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 424addd65adSMichael Halcrow &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, 4252aac0cf8STyler Hicks NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, 426addd65adSMichael Halcrow ecryptfs_dentry->d_name.len); 427addd65adSMichael Halcrow if (rc) { 428addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 429addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 430bc65a121SAl Viro goto out; 431addd65adSMichael Halcrow } 4322b0143b5SDavid Howells mutex_lock(&d_inode(lower_dir_dentry)->i_mutex); 4338787c7a3STyler Hicks lower_dentry = lookup_one_len(encrypted_and_encoded_name, 4348787c7a3STyler Hicks lower_dir_dentry, 4358787c7a3STyler Hicks encrypted_and_encoded_name_size); 4362b0143b5SDavid Howells mutex_unlock(&d_inode(lower_dir_dentry)->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, 441addd65adSMichael Halcrow encrypted_and_encoded_name); 442bc65a121SAl Viro goto out; 443addd65adSMichael Halcrow } 4445ccf9203STyler Hicks interpose: 4455ccf9203STyler Hicks rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, 44670b89021STyler Hicks ecryptfs_dir_inode); 447addd65adSMichael Halcrow out: 448addd65adSMichael Halcrow kfree(encrypted_and_encoded_name); 449237fead6SMichael Halcrow return ERR_PTR(rc); 450237fead6SMichael Halcrow } 451237fead6SMichael Halcrow 452237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 453237fead6SMichael Halcrow struct dentry *new_dentry) 454237fead6SMichael Halcrow { 455237fead6SMichael Halcrow struct dentry *lower_old_dentry; 456237fead6SMichael Halcrow struct dentry *lower_new_dentry; 457237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 458237fead6SMichael Halcrow u64 file_size_save; 459237fead6SMichael Halcrow int rc; 460237fead6SMichael Halcrow 4612b0143b5SDavid Howells file_size_save = i_size_read(d_inode(old_dentry)); 462237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 463237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 464237fead6SMichael Halcrow dget(lower_old_dentry); 465237fead6SMichael Halcrow dget(lower_new_dentry); 466237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 4672b0143b5SDavid Howells rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), 468146a8595SJ. Bruce Fields lower_new_dentry, NULL); 4692b0143b5SDavid Howells if (rc || d_really_is_negative(lower_new_dentry)) 470237fead6SMichael Halcrow goto out_lock; 4715ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 472237fead6SMichael Halcrow if (rc) 473237fead6SMichael Halcrow goto out_lock; 4742b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 4752b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 4762b0143b5SDavid Howells set_nlink(d_inode(old_dentry), 4772b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); 4782b0143b5SDavid Howells i_size_write(d_inode(new_dentry), file_size_save); 479237fead6SMichael Halcrow out_lock: 480237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 481237fead6SMichael Halcrow dput(lower_new_dentry); 482237fead6SMichael Halcrow dput(lower_old_dentry); 483237fead6SMichael Halcrow return rc; 484237fead6SMichael Halcrow } 485237fead6SMichael Halcrow 486237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 487237fead6SMichael Halcrow { 4882b0143b5SDavid Howells return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); 489237fead6SMichael Halcrow } 490237fead6SMichael Halcrow 491237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 492237fead6SMichael Halcrow const char *symname) 493237fead6SMichael Halcrow { 494237fead6SMichael Halcrow int rc; 495237fead6SMichael Halcrow struct dentry *lower_dentry; 496237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 497237fead6SMichael Halcrow char *encoded_symname; 498addd65adSMichael Halcrow size_t encoded_symlen; 499addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 500237fead6SMichael Halcrow 501237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 502237fead6SMichael Halcrow dget(lower_dentry); 503237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 504addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 505addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 506addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 507addd65adSMichael Halcrow &encoded_symlen, 508addd65adSMichael Halcrow NULL, 509addd65adSMichael Halcrow mount_crypt_stat, symname, 510addd65adSMichael Halcrow strlen(symname)); 511addd65adSMichael Halcrow if (rc) 512237fead6SMichael Halcrow goto out_lock; 5132b0143b5SDavid Howells rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry, 514db2e747bSMiklos Szeredi encoded_symname); 515237fead6SMichael Halcrow kfree(encoded_symname); 5162b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 517237fead6SMichael Halcrow goto out_lock; 5185ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 519237fead6SMichael Halcrow if (rc) 520237fead6SMichael Halcrow goto out_lock; 5212b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5222b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 523237fead6SMichael Halcrow out_lock: 524237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 525237fead6SMichael Halcrow dput(lower_dentry); 5262b0143b5SDavid Howells if (d_really_is_negative(dentry)) 527237fead6SMichael Halcrow d_drop(dentry); 528237fead6SMichael Halcrow return rc; 529237fead6SMichael Halcrow } 530237fead6SMichael Halcrow 53118bb1db3SAl Viro static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 532237fead6SMichael Halcrow { 533237fead6SMichael Halcrow int rc; 534237fead6SMichael Halcrow struct dentry *lower_dentry; 535237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 536237fead6SMichael Halcrow 537237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 538237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 5392b0143b5SDavid Howells rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode); 5402b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 541237fead6SMichael Halcrow goto out; 5425ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 543237fead6SMichael Halcrow if (rc) 544237fead6SMichael Halcrow goto out; 5452b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5462b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 5472b0143b5SDavid Howells set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); 548237fead6SMichael Halcrow out: 549237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5502b0143b5SDavid Howells if (d_really_is_negative(dentry)) 551237fead6SMichael Halcrow d_drop(dentry); 552237fead6SMichael Halcrow return rc; 553237fead6SMichael Halcrow } 554237fead6SMichael Halcrow 555237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 556237fead6SMichael Halcrow { 557237fead6SMichael Halcrow struct dentry *lower_dentry; 558237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 55945ec4abaSMichael Halcrow int rc; 560237fead6SMichael Halcrow 561237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 56245ec4abaSMichael Halcrow dget(dentry); 563237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 56445ec4abaSMichael Halcrow dget(lower_dentry); 5652b0143b5SDavid Howells rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry); 56645ec4abaSMichael Halcrow dput(lower_dentry); 5672b0143b5SDavid Howells if (!rc && d_really_is_positive(dentry)) 5682b0143b5SDavid Howells clear_nlink(d_inode(dentry)); 5692b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5702b0143b5SDavid Howells set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); 571237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 572237fead6SMichael Halcrow if (!rc) 573237fead6SMichael Halcrow d_drop(dentry); 57445ec4abaSMichael Halcrow dput(dentry); 575237fead6SMichael Halcrow return rc; 576237fead6SMichael Halcrow } 577237fead6SMichael Halcrow 578237fead6SMichael Halcrow static int 5791a67aafbSAl Viro ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) 580237fead6SMichael Halcrow { 581237fead6SMichael Halcrow int rc; 582237fead6SMichael Halcrow struct dentry *lower_dentry; 583237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 584237fead6SMichael Halcrow 585237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 586237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 5872b0143b5SDavid Howells rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev); 5882b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 589237fead6SMichael Halcrow goto out; 5905ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 591237fead6SMichael Halcrow if (rc) 592237fead6SMichael Halcrow goto out; 5932b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5942b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 595237fead6SMichael Halcrow out: 596237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5972b0143b5SDavid Howells if (d_really_is_negative(dentry)) 598237fead6SMichael Halcrow d_drop(dentry); 599237fead6SMichael Halcrow return rc; 600237fead6SMichael Halcrow } 601237fead6SMichael Halcrow 602237fead6SMichael Halcrow static int 603237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 604237fead6SMichael Halcrow struct inode *new_dir, struct dentry *new_dentry) 605237fead6SMichael Halcrow { 606237fead6SMichael Halcrow int rc; 607237fead6SMichael Halcrow struct dentry *lower_old_dentry; 608237fead6SMichael Halcrow struct dentry *lower_new_dentry; 609237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 610237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 6110d132f73SErez Zadok struct dentry *trap = NULL; 6128335eafcSTyler Hicks struct inode *target_inode; 613237fead6SMichael Halcrow 614237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 615237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 616237fead6SMichael Halcrow dget(lower_old_dentry); 617237fead6SMichael Halcrow dget(lower_new_dentry); 618237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 619237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 6202b0143b5SDavid Howells target_inode = d_inode(new_dentry); 6210d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 6220d132f73SErez Zadok /* source should not be ancestor of target */ 6230d132f73SErez Zadok if (trap == lower_old_dentry) { 6240d132f73SErez Zadok rc = -EINVAL; 6250d132f73SErez Zadok goto out_lock; 6260d132f73SErez Zadok } 6270d132f73SErez Zadok /* target should not be ancestor of source */ 6280d132f73SErez Zadok if (trap == lower_new_dentry) { 6290d132f73SErez Zadok rc = -ENOTEMPTY; 6300d132f73SErez Zadok goto out_lock; 6310d132f73SErez Zadok } 6322b0143b5SDavid Howells rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, 6332b0143b5SDavid Howells d_inode(lower_new_dir_dentry), lower_new_dentry, 634520c8b16SMiklos Szeredi NULL, 0); 635237fead6SMichael Halcrow if (rc) 636237fead6SMichael Halcrow goto out_lock; 6378335eafcSTyler Hicks if (target_inode) 6388335eafcSTyler Hicks fsstack_copy_attr_all(target_inode, 6398335eafcSTyler Hicks ecryptfs_inode_to_lower(target_inode)); 6402b0143b5SDavid Howells fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); 641237fead6SMichael Halcrow if (new_dir != old_dir) 6422b0143b5SDavid Howells fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); 643237fead6SMichael Halcrow out_lock: 644237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 645dd55c898STyler Hicks dput(lower_new_dir_dentry); 646dd55c898STyler Hicks dput(lower_old_dir_dentry); 647237fead6SMichael Halcrow dput(lower_new_dentry); 648237fead6SMichael Halcrow dput(lower_old_dentry); 649237fead6SMichael Halcrow return rc; 650237fead6SMichael Halcrow } 651237fead6SMichael Halcrow 652b22e8fedSAl Viro static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) 653237fead6SMichael Halcrow { 6543a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 655237fead6SMichael Halcrow char *lower_buf; 656b22e8fedSAl Viro char *buf; 657addd65adSMichael Halcrow mm_segment_t old_fs; 658addd65adSMichael Halcrow int rc; 659237fead6SMichael Halcrow 660408bd629SAl Viro lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); 661b22e8fedSAl Viro if (!lower_buf) 662b22e8fedSAl Viro return ERR_PTR(-ENOMEM); 663237fead6SMichael Halcrow old_fs = get_fs(); 664237fead6SMichael Halcrow set_fs(get_ds()); 6652b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->readlink(lower_dentry, 666237fead6SMichael Halcrow (char __user *)lower_buf, 667408bd629SAl Viro PATH_MAX); 668237fead6SMichael Halcrow set_fs(old_fs); 6693a60a168STyler Hicks if (rc < 0) 6703a60a168STyler Hicks goto out; 671b22e8fedSAl Viro rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, 672408bd629SAl Viro lower_buf, rc); 6733a60a168STyler Hicks out: 674237fead6SMichael Halcrow kfree(lower_buf); 675b22e8fedSAl Viro return rc ? ERR_PTR(rc) : buf; 6763a60a168STyler Hicks } 6773a60a168STyler Hicks 678237fead6SMichael Halcrow static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) 679237fead6SMichael Halcrow { 680b22e8fedSAl Viro size_t len; 681b22e8fedSAl Viro char *buf = ecryptfs_readlink_lower(dentry, &len); 682b22e8fedSAl Viro if (IS_ERR(buf)) 683237fead6SMichael Halcrow goto out; 6842b0143b5SDavid Howells fsstack_copy_attr_atime(d_inode(dentry), 6852b0143b5SDavid Howells d_inode(ecryptfs_dentry_to_lower(dentry))); 686408bd629SAl Viro buf[len] = '\0'; 687237fead6SMichael Halcrow out: 688806892e9SOGAWA Hirofumi nd_set_link(nd, buf); 689806892e9SOGAWA Hirofumi return NULL; 690237fead6SMichael Halcrow } 691237fead6SMichael Halcrow 692237fead6SMichael Halcrow /** 693237fead6SMichael Halcrow * upper_size_to_lower_size 694237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 695237fead6SMichael Halcrow * @upper_size: Size of the upper file 696237fead6SMichael Halcrow * 697cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 698237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 699237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 700237fead6SMichael Halcrow * 701237fead6SMichael Halcrow * Returns Calculated size of the lower file. 702237fead6SMichael Halcrow */ 703237fead6SMichael Halcrow static loff_t 704237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 705237fead6SMichael Halcrow loff_t upper_size) 706237fead6SMichael Halcrow { 707237fead6SMichael Halcrow loff_t lower_size; 708237fead6SMichael Halcrow 709157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 710237fead6SMichael Halcrow if (upper_size != 0) { 711237fead6SMichael Halcrow loff_t num_extents; 712237fead6SMichael Halcrow 713237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 714237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 715237fead6SMichael Halcrow num_extents++; 716237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 717237fead6SMichael Halcrow } 718237fead6SMichael Halcrow return lower_size; 719237fead6SMichael Halcrow } 720237fead6SMichael Halcrow 721237fead6SMichael Halcrow /** 7225f3ef64fSTyler Hicks * truncate_upper 723237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7245f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7255f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 726237fead6SMichael Halcrow * 727237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 728237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7295f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7305f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7315f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7325f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7335f3ef64fSTyler Hicks * the truncation of the lower inode. 734237fead6SMichael Halcrow * 735237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 736237fead6SMichael Halcrow */ 7375f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7385f3ef64fSTyler Hicks struct iattr *lower_ia) 739237fead6SMichael Halcrow { 740237fead6SMichael Halcrow int rc = 0; 7412b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 742237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 743237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 744237fead6SMichael Halcrow loff_t lower_size_before_truncate; 745237fead6SMichael Halcrow loff_t lower_size_after_truncate; 746237fead6SMichael Halcrow 7475f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7485f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 749332ab16fSTyler Hicks return 0; 7505f3ef64fSTyler Hicks } 7513b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 752332ab16fSTyler Hicks if (rc) 753332ab16fSTyler Hicks return rc; 7542b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 755237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7565f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7572ed92554SMichael Halcrow char zero[] = { 0x00 }; 758240e2df5SMichael Halcrow 7595f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7602ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7612ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7622ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7632ed92554SMichael Halcrow * file and the new and of the file */ 76448c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7655f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7665f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7675f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7685f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 7695f3ef64fSTyler Hicks * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to 7702ed92554SMichael Halcrow * PAGE_CACHE_SIZE with zeros. */ 7712ed92554SMichael Halcrow size_t num_zeros = (PAGE_CACHE_SIZE 7725f3ef64fSTyler Hicks - (ia->ia_size & ~PAGE_CACHE_MASK)); 7732ed92554SMichael Halcrow 7742c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7752c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7765f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7775f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 77848c1e44aSAl Viro goto out; 77913a791b4STyler Hicks } 7802ed92554SMichael Halcrow if (num_zeros) { 7812ed92554SMichael Halcrow char *zeros_virt; 7822ed92554SMichael Halcrow 7832ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7842ed92554SMichael Halcrow if (!zeros_virt) { 7852ed92554SMichael Halcrow rc = -ENOMEM; 78648c1e44aSAl Viro goto out; 787240e2df5SMichael Halcrow } 78848c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 7895f3ef64fSTyler Hicks ia->ia_size, num_zeros); 7902ed92554SMichael Halcrow kfree(zeros_virt); 7915dda6992SMichael Halcrow if (rc) { 792240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 793240e2df5SMichael Halcrow "the remainder of the end page on " 794240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 79548c1e44aSAl Viro goto out; 796240e2df5SMichael Halcrow } 797240e2df5SMichael Halcrow } 7982c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7990216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 800dd2a3b7aSMichael Halcrow if (rc) { 801dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 802dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 803dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 80448c1e44aSAl Viro goto out; 805dd2a3b7aSMichael Halcrow } 806237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 807237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 808237fead6SMichael Halcrow lower_size_before_truncate = 809237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 810237fead6SMichael Halcrow lower_size_after_truncate = 8115f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 8125f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 8135f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 8145f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 8155f3ef64fSTyler Hicks } else 8165f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 817237fead6SMichael Halcrow } 818237fead6SMichael Halcrow out: 819332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 820237fead6SMichael Halcrow return rc; 821237fead6SMichael Halcrow } 822237fead6SMichael Halcrow 823a261a039STyler Hicks static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) 824a261a039STyler Hicks { 825a261a039STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 826a261a039STyler Hicks loff_t lower_oldsize, lower_newsize; 827a261a039STyler Hicks 828a261a039STyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 829a261a039STyler Hicks lower_oldsize = upper_size_to_lower_size(crypt_stat, 830a261a039STyler Hicks i_size_read(inode)); 831a261a039STyler Hicks lower_newsize = upper_size_to_lower_size(crypt_stat, offset); 832a261a039STyler Hicks if (lower_newsize > lower_oldsize) { 833a261a039STyler Hicks /* 834a261a039STyler Hicks * The eCryptfs inode and the new *lower* size are mixed here 835a261a039STyler Hicks * because we may not have the lower i_mutex held and/or it may 836a261a039STyler Hicks * not be appropriate to call inode_newsize_ok() with inodes 837a261a039STyler Hicks * from other filesystems. 838a261a039STyler Hicks */ 839a261a039STyler Hicks return inode_newsize_ok(inode, lower_newsize); 840a261a039STyler Hicks } 841a261a039STyler Hicks 842a261a039STyler Hicks return 0; 843a261a039STyler Hicks } 844a261a039STyler Hicks 8455f3ef64fSTyler Hicks /** 8465f3ef64fSTyler Hicks * ecryptfs_truncate 8475f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8485f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8495f3ef64fSTyler Hicks * 8505f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8515f3ef64fSTyler Hicks * its corresponding lower inode. 8525f3ef64fSTyler Hicks * 8535f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8545f3ef64fSTyler Hicks */ 8555f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8565f3ef64fSTyler Hicks { 8575f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8585f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8595f3ef64fSTyler Hicks int rc; 8605f3ef64fSTyler Hicks 8612b0143b5SDavid Howells rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); 862a261a039STyler Hicks if (rc) 863a261a039STyler Hicks return rc; 864a261a039STyler Hicks 8655f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8665f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8675f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8685f3ef64fSTyler Hicks 8692b0143b5SDavid Howells mutex_lock(&d_inode(lower_dentry)->i_mutex); 87027ac0ffeSJ. Bruce Fields rc = notify_change(lower_dentry, &lower_ia, NULL); 8712b0143b5SDavid Howells mutex_unlock(&d_inode(lower_dentry)->i_mutex); 8725f3ef64fSTyler Hicks } 8735f3ef64fSTyler Hicks return rc; 8745f3ef64fSTyler Hicks } 8755f3ef64fSTyler Hicks 876237fead6SMichael Halcrow static int 87710556cb2SAl Viro ecryptfs_permission(struct inode *inode, int mask) 878237fead6SMichael Halcrow { 879f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 880237fead6SMichael Halcrow } 881237fead6SMichael Halcrow 882237fead6SMichael Halcrow /** 883237fead6SMichael Halcrow * ecryptfs_setattr 884237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 885237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 886237fead6SMichael Halcrow * 887237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 888237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 889237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 890237fead6SMichael Halcrow * 891237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 892237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 893237fead6SMichael Halcrow */ 894237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 895237fead6SMichael Halcrow { 896237fead6SMichael Halcrow int rc = 0; 897237fead6SMichael Halcrow struct dentry *lower_dentry; 8985f3ef64fSTyler Hicks struct iattr lower_ia; 899237fead6SMichael Halcrow struct inode *inode; 900237fead6SMichael Halcrow struct inode *lower_inode; 901237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 902237fead6SMichael Halcrow 9032b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 904e10f281bSMichael Halcrow if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) 905e10f281bSMichael Halcrow ecryptfs_init_crypt_stat(crypt_stat); 9062b0143b5SDavid Howells inode = d_inode(dentry); 907237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 908e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 909e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 910e36cb0b8SDavid Howells if (d_is_dir(dentry)) 911e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 912e36cb0b8SDavid Howells else if (d_is_reg(dentry) 91364ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 91464ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 915e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 916e10f281bSMichael Halcrow 917e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 918e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9193b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 920332ab16fSTyler Hicks if (rc) { 921332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 922332ab16fSTyler Hicks goto out; 923332ab16fSTyler Hicks } 924d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 925332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9265dda6992SMichael Halcrow if (rc) { 927e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 928e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 929e10f281bSMichael Halcrow rc = -EIO; 93025bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 931e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 93225bd8174SMichael Halcrow "or the key could not be retrieved. " 93325bd8174SMichael Halcrow "Plaintext passthrough mode is not " 934e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 935e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 936e10f281bSMichael Halcrow goto out; 937e10f281bSMichael Halcrow } 938e10f281bSMichael Halcrow rc = 0; 9393aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9403aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 941e10f281bSMichael Halcrow } 942e10f281bSMichael Halcrow } 943e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 944a261a039STyler Hicks 945a261a039STyler Hicks rc = inode_change_ok(inode, ia); 946a261a039STyler Hicks if (rc) 947a261a039STyler Hicks goto out; 948a261a039STyler Hicks if (ia->ia_valid & ATTR_SIZE) { 949a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); 950a261a039STyler Hicks if (rc) 951a261a039STyler Hicks goto out; 952a261a039STyler Hicks } 953a261a039STyler Hicks 9545f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9555f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9565f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 957237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9585f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 959237fead6SMichael Halcrow if (rc < 0) 960237fead6SMichael Halcrow goto out; 961237fead6SMichael Halcrow } 9621ac564ecSJeff Layton 9631ac564ecSJeff Layton /* 9641ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9651ac564ecSJeff Layton * to interpret this in its own way. 9661ac564ecSJeff Layton */ 9675f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9685f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9691ac564ecSJeff Layton 9702b0143b5SDavid Howells mutex_lock(&d_inode(lower_dentry)->i_mutex); 97127ac0ffeSJ. Bruce Fields rc = notify_change(lower_dentry, &lower_ia, NULL); 9722b0143b5SDavid Howells mutex_unlock(&d_inode(lower_dentry)->i_mutex); 973237fead6SMichael Halcrow out: 9749afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 975237fead6SMichael Halcrow return rc; 976237fead6SMichael Halcrow } 977237fead6SMichael Halcrow 978111d61a2STyler Hicks static int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, 9793a60a168STyler Hicks struct kstat *stat) 9803a60a168STyler Hicks { 9813a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9823a60a168STyler Hicks int rc = 0; 9833a60a168STyler Hicks 9843a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9853a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 9862b0143b5SDavid Howells generic_fillattr(d_inode(dentry), stat); 9873a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 9883a60a168STyler Hicks char *target; 9893a60a168STyler Hicks size_t targetsiz; 9903a60a168STyler Hicks 991b22e8fedSAl Viro target = ecryptfs_readlink_lower(dentry, &targetsiz); 992b22e8fedSAl Viro if (!IS_ERR(target)) { 9933a60a168STyler Hicks kfree(target); 9943a60a168STyler Hicks stat->size = targetsiz; 995b22e8fedSAl Viro } else { 996b22e8fedSAl Viro rc = PTR_ERR(target); 9973a60a168STyler Hicks } 9983a60a168STyler Hicks } 9993a60a168STyler Hicks return rc; 10003a60a168STyler Hicks } 10013a60a168STyler Hicks 1002111d61a2STyler Hicks static int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1003f8f484d1STyler Hicks struct kstat *stat) 1004f8f484d1STyler Hicks { 1005f8f484d1STyler Hicks struct kstat lower_stat; 1006f8f484d1STyler Hicks int rc; 1007f8f484d1STyler Hicks 10083dadecceSAl Viro rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat); 1009f8f484d1STyler Hicks if (!rc) { 10102b0143b5SDavid Howells fsstack_copy_attr_all(d_inode(dentry), 10112b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(dentry))); 10122b0143b5SDavid Howells generic_fillattr(d_inode(dentry), stat); 1013f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1014f8f484d1STyler Hicks } 1015f8f484d1STyler Hicks return rc; 1016f8f484d1STyler Hicks } 1017f8f484d1STyler Hicks 1018dd2a3b7aSMichael Halcrow int 1019237fead6SMichael Halcrow ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, 1020237fead6SMichael Halcrow size_t size, int flags) 1021237fead6SMichael Halcrow { 1022237fead6SMichael Halcrow int rc = 0; 1023237fead6SMichael Halcrow struct dentry *lower_dentry; 1024237fead6SMichael Halcrow 1025237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10262b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->setxattr) { 1027cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1028237fead6SMichael Halcrow goto out; 1029237fead6SMichael Halcrow } 103048b512e6SRoberto Sassu 103148b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 10322b0143b5SDavid Howells if (!rc && d_really_is_positive(dentry)) 10332b0143b5SDavid Howells fsstack_copy_attr_all(d_inode(dentry), d_inode(lower_dentry)); 1034237fead6SMichael Halcrow out: 1035237fead6SMichael Halcrow return rc; 1036237fead6SMichael Halcrow } 1037237fead6SMichael Halcrow 1038dd2a3b7aSMichael Halcrow ssize_t 1039d7cdc5feSMichael Halcrow ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, 1040d7cdc5feSMichael Halcrow void *value, size_t size) 1041d7cdc5feSMichael Halcrow { 1042d7cdc5feSMichael Halcrow int rc = 0; 1043d7cdc5feSMichael Halcrow 10442b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->getxattr) { 1045cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1046d7cdc5feSMichael Halcrow goto out; 1047d7cdc5feSMichael Halcrow } 10482b0143b5SDavid Howells mutex_lock(&d_inode(lower_dentry)->i_mutex); 10492b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->getxattr(lower_dentry, name, value, 1050d7cdc5feSMichael Halcrow size); 10512b0143b5SDavid Howells mutex_unlock(&d_inode(lower_dentry)->i_mutex); 1052d7cdc5feSMichael Halcrow out: 1053d7cdc5feSMichael Halcrow return rc; 1054d7cdc5feSMichael Halcrow } 1055d7cdc5feSMichael Halcrow 10567896b631SAdrian Bunk static ssize_t 1057237fead6SMichael Halcrow ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, 1058237fead6SMichael Halcrow size_t size) 1059237fead6SMichael Halcrow { 10602ed92554SMichael Halcrow return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, 10612ed92554SMichael Halcrow value, size); 1062237fead6SMichael Halcrow } 1063237fead6SMichael Halcrow 1064237fead6SMichael Halcrow static ssize_t 1065237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1066237fead6SMichael Halcrow { 1067237fead6SMichael Halcrow int rc = 0; 1068237fead6SMichael Halcrow struct dentry *lower_dentry; 1069237fead6SMichael Halcrow 1070237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10712b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->listxattr) { 1072cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1073237fead6SMichael Halcrow goto out; 1074237fead6SMichael Halcrow } 10752b0143b5SDavid Howells mutex_lock(&d_inode(lower_dentry)->i_mutex); 10762b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); 10772b0143b5SDavid Howells mutex_unlock(&d_inode(lower_dentry)->i_mutex); 1078237fead6SMichael Halcrow out: 1079237fead6SMichael Halcrow return rc; 1080237fead6SMichael Halcrow } 1081237fead6SMichael Halcrow 1082237fead6SMichael Halcrow static int ecryptfs_removexattr(struct dentry *dentry, const char *name) 1083237fead6SMichael Halcrow { 1084237fead6SMichael Halcrow int rc = 0; 1085237fead6SMichael Halcrow struct dentry *lower_dentry; 1086237fead6SMichael Halcrow 1087237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10882b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->removexattr) { 1089cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1090237fead6SMichael Halcrow goto out; 1091237fead6SMichael Halcrow } 10922b0143b5SDavid Howells mutex_lock(&d_inode(lower_dentry)->i_mutex); 10932b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->removexattr(lower_dentry, name); 10942b0143b5SDavid Howells mutex_unlock(&d_inode(lower_dentry)->i_mutex); 1095237fead6SMichael Halcrow out: 1096237fead6SMichael Halcrow return rc; 1097237fead6SMichael Halcrow } 1098237fead6SMichael Halcrow 1099754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 1100408bd629SAl Viro .readlink = generic_readlink, 1101237fead6SMichael Halcrow .follow_link = ecryptfs_follow_link, 110287dc800bSAl Viro .put_link = kfree_put_link, 1103237fead6SMichael Halcrow .permission = ecryptfs_permission, 1104237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 11053a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1106237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1107237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1108237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1109237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1110237fead6SMichael Halcrow }; 1111237fead6SMichael Halcrow 1112754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1113237fead6SMichael Halcrow .create = ecryptfs_create, 1114237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1115237fead6SMichael Halcrow .link = ecryptfs_link, 1116237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1117237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1118237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1119237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1120237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1121237fead6SMichael Halcrow .rename = ecryptfs_rename, 1122237fead6SMichael Halcrow .permission = ecryptfs_permission, 1123237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1124237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1125237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1126237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1127237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1128237fead6SMichael Halcrow }; 1129237fead6SMichael Halcrow 1130754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1131237fead6SMichael Halcrow .permission = ecryptfs_permission, 1132237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1133f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1134237fead6SMichael Halcrow .setxattr = ecryptfs_setxattr, 1135237fead6SMichael Halcrow .getxattr = ecryptfs_getxattr, 1136237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1137237fead6SMichael Halcrow .removexattr = ecryptfs_removexattr 1138237fead6SMichael Halcrow }; 1139