11a59d1b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2237fead6SMichael Halcrow /** 3237fead6SMichael Halcrow * eCryptfs: Linux filesystem encryption layer 4237fead6SMichael Halcrow * 5237fead6SMichael Halcrow * Copyright (C) 1997-2004 Erez Zadok 6237fead6SMichael Halcrow * Copyright (C) 2001-2004 Stony Brook University 7dd2a3b7aSMichael Halcrow * Copyright (C) 2004-2007 International Business Machines Corp. 8237fead6SMichael Halcrow * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> 9237fead6SMichael Halcrow * Michael C. Thompsion <mcthomps@us.ibm.com> 10237fead6SMichael Halcrow */ 11237fead6SMichael Halcrow 12237fead6SMichael Halcrow #include <linux/file.h> 13237fead6SMichael Halcrow #include <linux/vmalloc.h> 14237fead6SMichael Halcrow #include <linux/pagemap.h> 15237fead6SMichael Halcrow #include <linux/dcache.h> 16237fead6SMichael Halcrow #include <linux/namei.h> 17237fead6SMichael Halcrow #include <linux/mount.h> 180cc72dc7SJosef "Jeff" Sipek #include <linux/fs_stack.h> 195a0e3ad6STejun Heo #include <linux/slab.h> 2048b512e6SRoberto Sassu #include <linux/xattr.h> 210a688ad7SHarvey Harrison #include <asm/unaligned.h> 22237fead6SMichael Halcrow #include "ecryptfs_kernel.h" 23237fead6SMichael Halcrow 24237fead6SMichael Halcrow static struct dentry *lock_parent(struct dentry *dentry) 25237fead6SMichael Halcrow { 26237fead6SMichael Halcrow struct dentry *dir; 27237fead6SMichael Halcrow 288dc4e373SMiklos Szeredi dir = dget_parent(dentry); 295955102cSAl Viro inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); 30237fead6SMichael Halcrow return dir; 31237fead6SMichael Halcrow } 32237fead6SMichael Halcrow 33237fead6SMichael Halcrow static void unlock_dir(struct dentry *dir) 34237fead6SMichael Halcrow { 355955102cSAl Viro inode_unlock(d_inode(dir)); 36237fead6SMichael Halcrow dput(dir); 37237fead6SMichael Halcrow } 38237fead6SMichael Halcrow 39c4f79073STyler Hicks static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) 40c4f79073STyler Hicks { 41c4cf3ba4SHimangi Saraogi return ecryptfs_inode_to_lower(inode) == lower_inode; 42c4f79073STyler Hicks } 43c4f79073STyler Hicks 445ccf9203STyler Hicks static int ecryptfs_inode_set(struct inode *inode, void *opaque) 45c4f79073STyler Hicks { 465ccf9203STyler Hicks struct inode *lower_inode = opaque; 475ccf9203STyler Hicks 485ccf9203STyler Hicks ecryptfs_set_inode_lower(inode, lower_inode); 495ccf9203STyler Hicks fsstack_copy_attr_all(inode, lower_inode); 505ccf9203STyler Hicks /* i_size will be overwritten for encrypted regular files */ 515ccf9203STyler Hicks fsstack_copy_inode_size(inode, lower_inode); 525ccf9203STyler Hicks inode->i_ino = lower_inode->i_ino; 53c4f79073STyler Hicks inode->i_mapping->a_ops = &ecryptfs_aops; 545ccf9203STyler Hicks 555ccf9203STyler Hicks if (S_ISLNK(inode->i_mode)) 565ccf9203STyler Hicks inode->i_op = &ecryptfs_symlink_iops; 575ccf9203STyler Hicks else if (S_ISDIR(inode->i_mode)) 585ccf9203STyler Hicks inode->i_op = &ecryptfs_dir_iops; 595ccf9203STyler Hicks else 605ccf9203STyler Hicks inode->i_op = &ecryptfs_main_iops; 615ccf9203STyler Hicks 625ccf9203STyler Hicks if (S_ISDIR(inode->i_mode)) 635ccf9203STyler Hicks inode->i_fop = &ecryptfs_dir_fops; 645ccf9203STyler Hicks else if (special_file(inode->i_mode)) 655ccf9203STyler Hicks init_special_inode(inode, inode->i_mode, inode->i_rdev); 665ccf9203STyler Hicks else 675ccf9203STyler Hicks inode->i_fop = &ecryptfs_main_fops; 685ccf9203STyler Hicks 69c4f79073STyler Hicks return 0; 70c4f79073STyler Hicks } 71c4f79073STyler Hicks 725ccf9203STyler Hicks static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, 735ccf9203STyler Hicks struct super_block *sb) 745ccf9203STyler Hicks { 755ccf9203STyler Hicks struct inode *inode; 765ccf9203STyler Hicks 775ccf9203STyler Hicks if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) 785ccf9203STyler Hicks return ERR_PTR(-EXDEV); 795ccf9203STyler Hicks if (!igrab(lower_inode)) 805ccf9203STyler Hicks return ERR_PTR(-ESTALE); 815ccf9203STyler Hicks inode = iget5_locked(sb, (unsigned long)lower_inode, 825ccf9203STyler Hicks ecryptfs_inode_test, ecryptfs_inode_set, 835ccf9203STyler Hicks lower_inode); 845ccf9203STyler Hicks if (!inode) { 855ccf9203STyler Hicks iput(lower_inode); 865ccf9203STyler Hicks return ERR_PTR(-EACCES); 875ccf9203STyler Hicks } 885ccf9203STyler Hicks if (!(inode->i_state & I_NEW)) 895ccf9203STyler Hicks iput(lower_inode); 905ccf9203STyler Hicks 915ccf9203STyler Hicks return inode; 925ccf9203STyler Hicks } 935ccf9203STyler Hicks 94c4f79073STyler Hicks struct inode *ecryptfs_get_inode(struct inode *lower_inode, 95c4f79073STyler Hicks struct super_block *sb) 96c4f79073STyler Hicks { 975ccf9203STyler Hicks struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); 98c4f79073STyler Hicks 995ccf9203STyler Hicks if (!IS_ERR(inode) && (inode->i_state & I_NEW)) 100c4f79073STyler Hicks unlock_new_inode(inode); 1015ccf9203STyler Hicks 102c4f79073STyler Hicks return inode; 103c4f79073STyler Hicks } 104c4f79073STyler Hicks 105c4f79073STyler Hicks /** 106c4f79073STyler Hicks * ecryptfs_interpose 107c4f79073STyler Hicks * @lower_dentry: Existing dentry in the lower filesystem 108c4f79073STyler Hicks * @dentry: ecryptfs' dentry 109c4f79073STyler Hicks * @sb: ecryptfs's super_block 110c4f79073STyler Hicks * 111c4f79073STyler Hicks * Interposes upper and lower dentries. 112c4f79073STyler Hicks * 113c4f79073STyler Hicks * Returns zero on success; non-zero otherwise 114c4f79073STyler Hicks */ 115c4f79073STyler Hicks static int ecryptfs_interpose(struct dentry *lower_dentry, 1165ccf9203STyler Hicks struct dentry *dentry, struct super_block *sb) 117c4f79073STyler Hicks { 1182b0143b5SDavid Howells struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); 1195ccf9203STyler Hicks 120c4f79073STyler Hicks if (IS_ERR(inode)) 121c4f79073STyler Hicks return PTR_ERR(inode); 122c4f79073STyler Hicks d_instantiate(dentry, inode); 1235ccf9203STyler Hicks 124c4f79073STyler Hicks return 0; 125c4f79073STyler Hicks } 126c4f79073STyler Hicks 1278bc2d3cfSTyler Hicks static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, 1288bc2d3cfSTyler Hicks struct inode *inode) 1298bc2d3cfSTyler Hicks { 1308bc2d3cfSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 1318bc2d3cfSTyler Hicks struct dentry *lower_dir_dentry; 132bcf0d9d4SAl Viro struct inode *lower_dir_inode; 1338bc2d3cfSTyler Hicks int rc; 1348bc2d3cfSTyler Hicks 135bcf0d9d4SAl Viro lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); 136bcf0d9d4SAl Viro lower_dir_inode = d_inode(lower_dir_dentry); 137bcf0d9d4SAl Viro inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT); 138bcf0d9d4SAl Viro dget(lower_dentry); // don't even try to make the lower negative 139bcf0d9d4SAl Viro if (lower_dentry->d_parent != lower_dir_dentry) 140bcf0d9d4SAl Viro rc = -EINVAL; 141bcf0d9d4SAl Viro else if (d_unhashed(lower_dentry)) 142bcf0d9d4SAl Viro rc = -EINVAL; 143bcf0d9d4SAl Viro else 144b21996e3SJ. Bruce Fields rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); 1458bc2d3cfSTyler Hicks if (rc) { 1468bc2d3cfSTyler Hicks printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 1478bc2d3cfSTyler Hicks goto out_unlock; 1488bc2d3cfSTyler Hicks } 1498bc2d3cfSTyler Hicks fsstack_copy_attr_times(dir, lower_dir_inode); 1508bc2d3cfSTyler Hicks set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); 1518bc2d3cfSTyler Hicks inode->i_ctime = dir->i_ctime; 1528bc2d3cfSTyler Hicks out_unlock: 1538bc2d3cfSTyler Hicks dput(lower_dentry); 154bcf0d9d4SAl Viro inode_unlock(lower_dir_inode); 155bcf0d9d4SAl Viro if (!rc) 156bcf0d9d4SAl Viro d_drop(dentry); 1578bc2d3cfSTyler Hicks return rc; 1588bc2d3cfSTyler Hicks } 1598bc2d3cfSTyler Hicks 160237fead6SMichael Halcrow /** 161237fead6SMichael Halcrow * ecryptfs_do_create 162237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 163237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 164237fead6SMichael Halcrow * @mode: The mode of the new file 165237fead6SMichael Halcrow * 166237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 167237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 168237fead6SMichael Halcrow * stat of the lower directory inode. 169237fead6SMichael Halcrow * 170b59db43aSTyler Hicks * Returns the new eCryptfs inode on success; an ERR_PTR on error condition 171237fead6SMichael Halcrow */ 172b59db43aSTyler Hicks static struct inode * 173237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 174175a4eb7SAl Viro struct dentry *ecryptfs_dentry, umode_t mode) 175237fead6SMichael Halcrow { 176237fead6SMichael Halcrow int rc; 177237fead6SMichael Halcrow struct dentry *lower_dentry; 178237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 179b59db43aSTyler Hicks struct inode *inode; 180237fead6SMichael Halcrow 181237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 182237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 1832b0143b5SDavid Howells rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true); 1844981e081SMichael Halcrow if (rc) { 185caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 18618d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 187b59db43aSTyler Hicks inode = ERR_PTR(rc); 188237fead6SMichael Halcrow goto out_lock; 189237fead6SMichael Halcrow } 1902b0143b5SDavid Howells inode = __ecryptfs_get_inode(d_inode(lower_dentry), 1915ccf9203STyler Hicks directory_inode->i_sb); 1928bc2d3cfSTyler Hicks if (IS_ERR(inode)) { 1932b0143b5SDavid Howells vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL); 194237fead6SMichael Halcrow goto out_lock; 1958bc2d3cfSTyler Hicks } 1962b0143b5SDavid Howells fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); 1972b0143b5SDavid Howells fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); 198237fead6SMichael Halcrow out_lock: 199237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 200b59db43aSTyler Hicks return inode; 201237fead6SMichael Halcrow } 202237fead6SMichael Halcrow 203237fead6SMichael Halcrow /** 204237fead6SMichael Halcrow * ecryptfs_initialize_file 205237fead6SMichael Halcrow * 206237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 207237fead6SMichael Halcrow * file with a header and first data page. 208237fead6SMichael Halcrow * 209237fead6SMichael Halcrow * Returns zero on success 210237fead6SMichael Halcrow */ 211e3ccaa97STyler Hicks int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, 212b59db43aSTyler Hicks struct inode *ecryptfs_inode) 213237fead6SMichael Halcrow { 214d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 215b59db43aSTyler Hicks &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; 216237fead6SMichael Halcrow int rc = 0; 217237fead6SMichael Halcrow 218b59db43aSTyler Hicks if (S_ISDIR(ecryptfs_inode->i_mode)) { 219237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 220e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 221d7cdc5feSMichael Halcrow goto out; 222237fead6SMichael Halcrow } 223237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 224b59db43aSTyler Hicks rc = ecryptfs_new_file_context(ecryptfs_inode); 225237fead6SMichael Halcrow if (rc) { 226d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 227d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 228d7cdc5feSMichael Halcrow goto out; 229237fead6SMichael Halcrow } 230b59db43aSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); 231391b52f9SMichael Halcrow if (rc) { 232391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 233332ab16fSTyler Hicks "the lower file for the dentry with name " 2349e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2359e78d14aSDavid Howells ecryptfs_dentry, rc); 236391b52f9SMichael Halcrow goto out; 237391b52f9SMichael Halcrow } 238b59db43aSTyler Hicks rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); 239332ab16fSTyler Hicks if (rc) 240d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 241b59db43aSTyler Hicks ecryptfs_put_lower_file(ecryptfs_inode); 242237fead6SMichael Halcrow out: 243237fead6SMichael Halcrow return rc; 244237fead6SMichael Halcrow } 245237fead6SMichael Halcrow 246237fead6SMichael Halcrow /** 247237fead6SMichael Halcrow * ecryptfs_create 248237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 249237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 250237fead6SMichael Halcrow * @mode: The mode of the new file. 251237fead6SMichael Halcrow * 252237fead6SMichael Halcrow * Creates a new file. 253237fead6SMichael Halcrow * 254237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 255237fead6SMichael Halcrow */ 256237fead6SMichael Halcrow static int 257237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 258ebfc3b49SAl Viro umode_t mode, bool excl) 259237fead6SMichael Halcrow { 260b59db43aSTyler Hicks struct inode *ecryptfs_inode; 261237fead6SMichael Halcrow int rc; 262237fead6SMichael Halcrow 263b59db43aSTyler Hicks ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, 264b59db43aSTyler Hicks mode); 265a1c83681SViresh Kumar if (IS_ERR(ecryptfs_inode)) { 266237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 267237fead6SMichael Halcrow "lower filesystem\n"); 268b59db43aSTyler Hicks rc = PTR_ERR(ecryptfs_inode); 269237fead6SMichael Halcrow goto out; 270237fead6SMichael Halcrow } 271237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 272237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 273b59db43aSTyler Hicks rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); 274b59db43aSTyler Hicks if (rc) { 2758bc2d3cfSTyler Hicks ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, 2768bc2d3cfSTyler Hicks ecryptfs_inode); 2770e81ba23SAl Viro iget_failed(ecryptfs_inode); 278b59db43aSTyler Hicks goto out; 279b59db43aSTyler Hicks } 2801e2e547aSAl Viro d_instantiate_new(ecryptfs_dentry, ecryptfs_inode); 281237fead6SMichael Halcrow out: 282237fead6SMichael Halcrow return rc; 283237fead6SMichael Halcrow } 284237fead6SMichael Halcrow 285778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 286237fead6SMichael Halcrow { 2872aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 288778aeb42STyler Hicks int rc; 289237fead6SMichael Halcrow 290778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 291391b52f9SMichael Halcrow if (rc) { 292391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 293332ab16fSTyler Hicks "the lower file for the dentry with name " 2949e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2959e78d14aSDavid Howells dentry, rc); 296778aeb42STyler Hicks return rc; 297391b52f9SMichael Halcrow } 298778aeb42STyler Hicks 2993b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 3002aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 3012aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 3022aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 303778aeb42STyler Hicks 304778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 305778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 306237fead6SMichael Halcrow if (rc) { 307778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 308778aeb42STyler Hicks if (!rc) 309dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 310dd2a3b7aSMichael Halcrow } 311778aeb42STyler Hicks 312778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 313778aeb42STyler Hicks return 0; 314778aeb42STyler Hicks } 315778aeb42STyler Hicks 316778aeb42STyler Hicks /** 317778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 318778aeb42STyler Hicks */ 319b1168a92SAl Viro static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, 320b1168a92SAl Viro struct dentry *lower_dentry) 321778aeb42STyler Hicks { 3222b0143b5SDavid Howells struct inode *inode, *lower_inode = d_inode(lower_dentry); 323778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 324778aeb42STyler Hicks struct vfsmount *lower_mnt; 325778aeb42STyler Hicks int rc = 0; 326778aeb42STyler Hicks 327778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 328778aeb42STyler Hicks if (!dentry_info) { 329237fead6SMichael Halcrow dput(lower_dentry); 330b1168a92SAl Viro return ERR_PTR(-ENOMEM); 331778aeb42STyler Hicks } 3320b1d9011SAl Viro 3330b1d9011SAl Viro lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 334b1168a92SAl Viro fsstack_copy_attr_atime(d_inode(dentry->d_parent), 335b1168a92SAl Viro d_inode(lower_dentry->d_parent)); 33684d08fa8SAl Viro BUG_ON(!d_count(lower_dentry)); 3370b1d9011SAl Viro 3380b1d9011SAl Viro ecryptfs_set_dentry_private(dentry, dentry_info); 33992dd1230SAl Viro dentry_info->lower_path.mnt = lower_mnt; 34092dd1230SAl Viro dentry_info->lower_path.dentry = lower_dentry; 341778aeb42STyler Hicks 3422b0143b5SDavid Howells if (d_really_is_negative(lower_dentry)) { 343778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 344778aeb42STyler Hicks d_add(dentry, NULL); 345b1168a92SAl Viro return NULL; 346778aeb42STyler Hicks } 347b1168a92SAl Viro inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb); 348778aeb42STyler Hicks if (IS_ERR(inode)) { 349778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 350778aeb42STyler Hicks __func__, PTR_ERR(inode)); 351b1168a92SAl Viro return ERR_CAST(inode); 352778aeb42STyler Hicks } 353778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 354778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 355778aeb42STyler Hicks if (rc) { 356778aeb42STyler Hicks make_bad_inode(inode); 357b1168a92SAl Viro return ERR_PTR(rc); 358778aeb42STyler Hicks } 359778aeb42STyler Hicks } 360778aeb42STyler Hicks 361778aeb42STyler Hicks if (inode->i_state & I_NEW) 362778aeb42STyler Hicks unlock_new_inode(inode); 363b1168a92SAl Viro return d_splice_alias(inode, dentry); 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 37089076bc3SAl Viro * @flags: lookup flags 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; 38088ae4ab9SAl Viro struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 381addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 38288ae4ab9SAl Viro const char *name = ecryptfs_dentry->d_name.name; 38388ae4ab9SAl Viro size_t len = ecryptfs_dentry->d_name.len; 384b1168a92SAl Viro struct dentry *res; 385addd65adSMichael Halcrow int rc = 0; 386addd65adSMichael Halcrow 387addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 38888ae4ab9SAl Viro 389addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 390addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 391ab13a921SGuenter Roeck if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 392addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 39388ae4ab9SAl Viro &encrypted_and_encoded_name, &len, 39488ae4ab9SAl Viro mount_crypt_stat, name, len); 395addd65adSMichael Halcrow if (rc) { 396addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 397addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 398237fead6SMichael Halcrow return ERR_PTR(rc); 399237fead6SMichael Halcrow } 40088ae4ab9SAl Viro name = encrypted_and_encoded_name; 40188ae4ab9SAl Viro } 40288ae4ab9SAl Viro 40388ae4ab9SAl Viro lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); 404237fead6SMichael Halcrow if (IS_ERR(lower_dentry)) { 405237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 406b1168a92SAl Viro "[%ld] on lower_dentry = [%s]\n", __func__, 407b1168a92SAl Viro PTR_ERR(lower_dentry), 40888ae4ab9SAl Viro name); 409b1168a92SAl Viro res = ERR_CAST(lower_dentry); 41088ae4ab9SAl Viro } else { 411b1168a92SAl Viro res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); 41288ae4ab9SAl Viro } 413237fead6SMichael Halcrow kfree(encrypted_and_encoded_name); 414b1168a92SAl Viro return res; 415237fead6SMichael Halcrow } 416237fead6SMichael Halcrow 417237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 418237fead6SMichael Halcrow struct dentry *new_dentry) 419237fead6SMichael Halcrow { 420237fead6SMichael Halcrow struct dentry *lower_old_dentry; 421237fead6SMichael Halcrow struct dentry *lower_new_dentry; 422237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 423237fead6SMichael Halcrow u64 file_size_save; 424237fead6SMichael Halcrow int rc; 425237fead6SMichael Halcrow 4262b0143b5SDavid Howells file_size_save = i_size_read(d_inode(old_dentry)); 427237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 428237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 429237fead6SMichael Halcrow dget(lower_old_dentry); 430237fead6SMichael Halcrow dget(lower_new_dentry); 431237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 4322b0143b5SDavid Howells rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), 433146a8595SJ. Bruce Fields lower_new_dentry, NULL); 4342b0143b5SDavid Howells if (rc || d_really_is_negative(lower_new_dentry)) 435237fead6SMichael Halcrow goto out_lock; 4365ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 437237fead6SMichael Halcrow if (rc) 438237fead6SMichael Halcrow goto out_lock; 4392b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 4402b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 4412b0143b5SDavid Howells set_nlink(d_inode(old_dentry), 4422b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); 4432b0143b5SDavid Howells i_size_write(d_inode(new_dentry), file_size_save); 444237fead6SMichael Halcrow out_lock: 445237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 446237fead6SMichael Halcrow dput(lower_new_dentry); 447237fead6SMichael Halcrow dput(lower_old_dentry); 448237fead6SMichael Halcrow return rc; 449237fead6SMichael Halcrow } 450237fead6SMichael Halcrow 451237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 452237fead6SMichael Halcrow { 4532b0143b5SDavid Howells return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); 454237fead6SMichael Halcrow } 455237fead6SMichael Halcrow 456237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 457237fead6SMichael Halcrow const char *symname) 458237fead6SMichael Halcrow { 459237fead6SMichael Halcrow int rc; 460237fead6SMichael Halcrow struct dentry *lower_dentry; 461237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 462237fead6SMichael Halcrow char *encoded_symname; 463addd65adSMichael Halcrow size_t encoded_symlen; 464addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 465237fead6SMichael Halcrow 466237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 467237fead6SMichael Halcrow dget(lower_dentry); 468237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 469addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 470addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 471addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 472addd65adSMichael Halcrow &encoded_symlen, 473addd65adSMichael Halcrow mount_crypt_stat, symname, 474addd65adSMichael Halcrow strlen(symname)); 475addd65adSMichael Halcrow if (rc) 476237fead6SMichael Halcrow goto out_lock; 4772b0143b5SDavid Howells rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry, 478db2e747bSMiklos Szeredi encoded_symname); 479237fead6SMichael Halcrow kfree(encoded_symname); 4802b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 481237fead6SMichael Halcrow goto out_lock; 4825ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 483237fead6SMichael Halcrow if (rc) 484237fead6SMichael Halcrow goto out_lock; 4852b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 4862b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 487237fead6SMichael Halcrow out_lock: 488237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 489237fead6SMichael Halcrow dput(lower_dentry); 4902b0143b5SDavid Howells if (d_really_is_negative(dentry)) 491237fead6SMichael Halcrow d_drop(dentry); 492237fead6SMichael Halcrow return rc; 493237fead6SMichael Halcrow } 494237fead6SMichael Halcrow 49518bb1db3SAl Viro static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 496237fead6SMichael Halcrow { 497237fead6SMichael Halcrow int rc; 498237fead6SMichael Halcrow struct dentry *lower_dentry; 499237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 500237fead6SMichael Halcrow 501237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 502237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 5032b0143b5SDavid Howells rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode); 5042b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 505237fead6SMichael Halcrow goto out; 5065ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 507237fead6SMichael Halcrow if (rc) 508237fead6SMichael Halcrow goto out; 5092b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5102b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 5112b0143b5SDavid Howells set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); 512237fead6SMichael Halcrow out: 513237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5142b0143b5SDavid Howells if (d_really_is_negative(dentry)) 515237fead6SMichael Halcrow d_drop(dentry); 516237fead6SMichael Halcrow return rc; 517237fead6SMichael Halcrow } 518237fead6SMichael Halcrow 519237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 520237fead6SMichael Halcrow { 521237fead6SMichael Halcrow struct dentry *lower_dentry; 522237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 523bcf0d9d4SAl Viro struct inode *lower_dir_inode; 52445ec4abaSMichael Halcrow int rc; 525237fead6SMichael Halcrow 526237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 527bcf0d9d4SAl Viro lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); 528bcf0d9d4SAl Viro lower_dir_inode = d_inode(lower_dir_dentry); 529bcf0d9d4SAl Viro 530bcf0d9d4SAl Viro inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT); 531bcf0d9d4SAl Viro dget(lower_dentry); // don't even try to make the lower negative 532bcf0d9d4SAl Viro if (lower_dentry->d_parent != lower_dir_dentry) 533bcf0d9d4SAl Viro rc = -EINVAL; 534bcf0d9d4SAl Viro else if (d_unhashed(lower_dentry)) 535bcf0d9d4SAl Viro rc = -EINVAL; 536bcf0d9d4SAl Viro else 537bcf0d9d4SAl Viro rc = vfs_rmdir(lower_dir_inode, lower_dentry); 538bcf0d9d4SAl Viro if (!rc) { 5392b0143b5SDavid Howells clear_nlink(d_inode(dentry)); 540bcf0d9d4SAl Viro fsstack_copy_attr_times(dir, lower_dir_inode); 541bcf0d9d4SAl Viro set_nlink(dir, lower_dir_inode->i_nlink); 542bcf0d9d4SAl Viro } 543bcf0d9d4SAl Viro dput(lower_dentry); 544bcf0d9d4SAl Viro inode_unlock(lower_dir_inode); 545237fead6SMichael Halcrow if (!rc) 546237fead6SMichael Halcrow d_drop(dentry); 547237fead6SMichael Halcrow return rc; 548237fead6SMichael Halcrow } 549237fead6SMichael Halcrow 550237fead6SMichael Halcrow static int 5511a67aafbSAl Viro ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) 552237fead6SMichael Halcrow { 553237fead6SMichael Halcrow int rc; 554237fead6SMichael Halcrow struct dentry *lower_dentry; 555237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 556237fead6SMichael Halcrow 557237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 558237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 5592b0143b5SDavid Howells rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev); 5602b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 561237fead6SMichael Halcrow goto out; 5625ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 563237fead6SMichael Halcrow if (rc) 564237fead6SMichael Halcrow goto out; 5652b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5662b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 567237fead6SMichael Halcrow out: 568237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5692b0143b5SDavid Howells if (d_really_is_negative(dentry)) 570237fead6SMichael Halcrow d_drop(dentry); 571237fead6SMichael Halcrow return rc; 572237fead6SMichael Halcrow } 573237fead6SMichael Halcrow 574237fead6SMichael Halcrow static int 575237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 5761cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 5771cd66c93SMiklos Szeredi unsigned int flags) 578237fead6SMichael Halcrow { 579237fead6SMichael Halcrow int rc; 580237fead6SMichael Halcrow struct dentry *lower_old_dentry; 581237fead6SMichael Halcrow struct dentry *lower_new_dentry; 582237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 583237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 584bcf0d9d4SAl Viro struct dentry *trap; 5858335eafcSTyler Hicks struct inode *target_inode; 586237fead6SMichael Halcrow 5871cd66c93SMiklos Szeredi if (flags) 5881cd66c93SMiklos Szeredi return -EINVAL; 5891cd66c93SMiklos Szeredi 590bcf0d9d4SAl Viro lower_old_dir_dentry = ecryptfs_dentry_to_lower(old_dentry->d_parent); 591bcf0d9d4SAl Viro lower_new_dir_dentry = ecryptfs_dentry_to_lower(new_dentry->d_parent); 592bcf0d9d4SAl Viro 593237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 594237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 595bcf0d9d4SAl Viro 5962b0143b5SDavid Howells target_inode = d_inode(new_dentry); 597bcf0d9d4SAl Viro 5980d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 599bcf0d9d4SAl Viro dget(lower_new_dentry); 6000d132f73SErez Zadok rc = -EINVAL; 60174dd7c97SAl Viro if (lower_old_dentry->d_parent != lower_old_dir_dentry) 6020d132f73SErez Zadok goto out_lock; 60374dd7c97SAl Viro if (lower_new_dentry->d_parent != lower_new_dir_dentry) 60474dd7c97SAl Viro goto out_lock; 60574dd7c97SAl Viro if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry)) 60674dd7c97SAl Viro goto out_lock; 60774dd7c97SAl Viro /* source should not be ancestor of target */ 60874dd7c97SAl Viro if (trap == lower_old_dentry) 60974dd7c97SAl Viro goto out_lock; 6100d132f73SErez Zadok /* target should not be ancestor of source */ 6110d132f73SErez Zadok if (trap == lower_new_dentry) { 6120d132f73SErez Zadok rc = -ENOTEMPTY; 6130d132f73SErez Zadok goto out_lock; 6140d132f73SErez Zadok } 6152b0143b5SDavid Howells rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, 6162b0143b5SDavid Howells d_inode(lower_new_dir_dentry), lower_new_dentry, 617520c8b16SMiklos Szeredi NULL, 0); 618237fead6SMichael Halcrow if (rc) 619237fead6SMichael Halcrow goto out_lock; 6208335eafcSTyler Hicks if (target_inode) 6218335eafcSTyler Hicks fsstack_copy_attr_all(target_inode, 6228335eafcSTyler Hicks ecryptfs_inode_to_lower(target_inode)); 6232b0143b5SDavid Howells fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); 624237fead6SMichael Halcrow if (new_dir != old_dir) 6252b0143b5SDavid Howells fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); 626237fead6SMichael Halcrow out_lock: 627237fead6SMichael Halcrow dput(lower_new_dentry); 628bcf0d9d4SAl Viro unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 629237fead6SMichael Halcrow return rc; 630237fead6SMichael Halcrow } 631237fead6SMichael Halcrow 632b22e8fedSAl Viro static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) 633237fead6SMichael Halcrow { 6346c988f57SMiklos Szeredi DEFINE_DELAYED_CALL(done); 6353a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 6366c988f57SMiklos Szeredi const char *link; 637b22e8fedSAl Viro char *buf; 638addd65adSMichael Halcrow int rc; 639237fead6SMichael Halcrow 6406c988f57SMiklos Szeredi link = vfs_get_link(lower_dentry, &done); 6416c988f57SMiklos Szeredi if (IS_ERR(link)) 6426c988f57SMiklos Szeredi return ERR_CAST(link); 6436c988f57SMiklos Szeredi 644b22e8fedSAl Viro rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, 6456c988f57SMiklos Szeredi link, strlen(link)); 6466c988f57SMiklos Szeredi do_delayed_call(&done); 6476c988f57SMiklos Szeredi if (rc) 6486c988f57SMiklos Szeredi return ERR_PTR(rc); 6496c988f57SMiklos Szeredi 6506c988f57SMiklos Szeredi return buf; 6513a60a168STyler Hicks } 6523a60a168STyler Hicks 6536b255391SAl Viro static const char *ecryptfs_get_link(struct dentry *dentry, 654fceef393SAl Viro struct inode *inode, 655fceef393SAl Viro struct delayed_call *done) 656237fead6SMichael Halcrow { 657b22e8fedSAl Viro size_t len; 6586b255391SAl Viro char *buf; 6596b255391SAl Viro 6606b255391SAl Viro if (!dentry) 6616b255391SAl Viro return ERR_PTR(-ECHILD); 6626b255391SAl Viro 6636b255391SAl Viro buf = ecryptfs_readlink_lower(dentry, &len); 664b22e8fedSAl Viro if (IS_ERR(buf)) 665680baacbSAl Viro return buf; 6662b0143b5SDavid Howells fsstack_copy_attr_atime(d_inode(dentry), 6672b0143b5SDavid Howells d_inode(ecryptfs_dentry_to_lower(dentry))); 668408bd629SAl Viro buf[len] = '\0'; 669fceef393SAl Viro set_delayed_call(done, kfree_link, buf); 670fceef393SAl Viro return buf; 671237fead6SMichael Halcrow } 672237fead6SMichael Halcrow 673237fead6SMichael Halcrow /** 674237fead6SMichael Halcrow * upper_size_to_lower_size 675237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 676237fead6SMichael Halcrow * @upper_size: Size of the upper file 677237fead6SMichael Halcrow * 678cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 679237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 680237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 681237fead6SMichael Halcrow * 682237fead6SMichael Halcrow * Returns Calculated size of the lower file. 683237fead6SMichael Halcrow */ 684237fead6SMichael Halcrow static loff_t 685237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 686237fead6SMichael Halcrow loff_t upper_size) 687237fead6SMichael Halcrow { 688237fead6SMichael Halcrow loff_t lower_size; 689237fead6SMichael Halcrow 690157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 691237fead6SMichael Halcrow if (upper_size != 0) { 692237fead6SMichael Halcrow loff_t num_extents; 693237fead6SMichael Halcrow 694237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 695237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 696237fead6SMichael Halcrow num_extents++; 697237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 698237fead6SMichael Halcrow } 699237fead6SMichael Halcrow return lower_size; 700237fead6SMichael Halcrow } 701237fead6SMichael Halcrow 702237fead6SMichael Halcrow /** 7035f3ef64fSTyler Hicks * truncate_upper 704237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 7055f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 7065f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 707237fead6SMichael Halcrow * 708237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 709237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 7105f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 7115f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 7125f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 7135f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 7145f3ef64fSTyler Hicks * the truncation of the lower inode. 715237fead6SMichael Halcrow * 716237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 717237fead6SMichael Halcrow */ 7185f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7195f3ef64fSTyler Hicks struct iattr *lower_ia) 720237fead6SMichael Halcrow { 721237fead6SMichael Halcrow int rc = 0; 7222b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 723237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 724237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 725237fead6SMichael Halcrow loff_t lower_size_before_truncate; 726237fead6SMichael Halcrow loff_t lower_size_after_truncate; 727237fead6SMichael Halcrow 7285f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7295f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 730332ab16fSTyler Hicks return 0; 7315f3ef64fSTyler Hicks } 7323b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 733332ab16fSTyler Hicks if (rc) 734332ab16fSTyler Hicks return rc; 7352b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 736237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7375f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7382ed92554SMichael Halcrow char zero[] = { 0x00 }; 739240e2df5SMichael Halcrow 7405f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7412ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7422ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7432ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7442ed92554SMichael Halcrow * file and the new and of the file */ 74548c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7465f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7475f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7485f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7495f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 750ea1754a0SKirill A. Shutemov * that page from (ia->ia_size & ~PAGE_MASK) to 751ea1754a0SKirill A. Shutemov * PAGE_SIZE with zeros. */ 75209cbfeafSKirill A. Shutemov size_t num_zeros = (PAGE_SIZE 75309cbfeafSKirill A. Shutemov - (ia->ia_size & ~PAGE_MASK)); 7542ed92554SMichael Halcrow 7552c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7562c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7575f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7585f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 75948c1e44aSAl Viro goto out; 76013a791b4STyler Hicks } 7612ed92554SMichael Halcrow if (num_zeros) { 7622ed92554SMichael Halcrow char *zeros_virt; 7632ed92554SMichael Halcrow 7642ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7652ed92554SMichael Halcrow if (!zeros_virt) { 7662ed92554SMichael Halcrow rc = -ENOMEM; 76748c1e44aSAl Viro goto out; 768240e2df5SMichael Halcrow } 76948c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 7705f3ef64fSTyler Hicks ia->ia_size, num_zeros); 7712ed92554SMichael Halcrow kfree(zeros_virt); 7725dda6992SMichael Halcrow if (rc) { 773240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 774240e2df5SMichael Halcrow "the remainder of the end page on " 775240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 77648c1e44aSAl Viro goto out; 777240e2df5SMichael Halcrow } 778240e2df5SMichael Halcrow } 7792c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7800216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 781dd2a3b7aSMichael Halcrow if (rc) { 782dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 783dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 784dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 78548c1e44aSAl Viro goto out; 786dd2a3b7aSMichael Halcrow } 787237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 788237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 789237fead6SMichael Halcrow lower_size_before_truncate = 790237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 791237fead6SMichael Halcrow lower_size_after_truncate = 7925f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 7935f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 7945f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 7955f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 7965f3ef64fSTyler Hicks } else 7975f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 798237fead6SMichael Halcrow } 799237fead6SMichael Halcrow out: 800332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 801237fead6SMichael Halcrow return rc; 802237fead6SMichael Halcrow } 803237fead6SMichael Halcrow 804a261a039STyler Hicks static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) 805a261a039STyler Hicks { 806a261a039STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 807a261a039STyler Hicks loff_t lower_oldsize, lower_newsize; 808a261a039STyler Hicks 809a261a039STyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 810a261a039STyler Hicks lower_oldsize = upper_size_to_lower_size(crypt_stat, 811a261a039STyler Hicks i_size_read(inode)); 812a261a039STyler Hicks lower_newsize = upper_size_to_lower_size(crypt_stat, offset); 813a261a039STyler Hicks if (lower_newsize > lower_oldsize) { 814a261a039STyler Hicks /* 815a261a039STyler Hicks * The eCryptfs inode and the new *lower* size are mixed here 816a261a039STyler Hicks * because we may not have the lower i_mutex held and/or it may 817a261a039STyler Hicks * not be appropriate to call inode_newsize_ok() with inodes 818a261a039STyler Hicks * from other filesystems. 819a261a039STyler Hicks */ 820a261a039STyler Hicks return inode_newsize_ok(inode, lower_newsize); 821a261a039STyler Hicks } 822a261a039STyler Hicks 823a261a039STyler Hicks return 0; 824a261a039STyler Hicks } 825a261a039STyler Hicks 8265f3ef64fSTyler Hicks /** 8275f3ef64fSTyler Hicks * ecryptfs_truncate 8285f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8295f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8305f3ef64fSTyler Hicks * 8315f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8325f3ef64fSTyler Hicks * its corresponding lower inode. 8335f3ef64fSTyler Hicks * 8345f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8355f3ef64fSTyler Hicks */ 8365f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8375f3ef64fSTyler Hicks { 8385f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8395f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8405f3ef64fSTyler Hicks int rc; 8415f3ef64fSTyler Hicks 8422b0143b5SDavid Howells rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); 843a261a039STyler Hicks if (rc) 844a261a039STyler Hicks return rc; 845a261a039STyler Hicks 8465f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8475f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8485f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8495f3ef64fSTyler Hicks 8505955102cSAl Viro inode_lock(d_inode(lower_dentry)); 85127ac0ffeSJ. Bruce Fields rc = notify_change(lower_dentry, &lower_ia, NULL); 8525955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 8535f3ef64fSTyler Hicks } 8545f3ef64fSTyler Hicks return rc; 8555f3ef64fSTyler Hicks } 8565f3ef64fSTyler Hicks 857237fead6SMichael Halcrow static int 85810556cb2SAl Viro ecryptfs_permission(struct inode *inode, int mask) 859237fead6SMichael Halcrow { 860f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 861237fead6SMichael Halcrow } 862237fead6SMichael Halcrow 863237fead6SMichael Halcrow /** 864237fead6SMichael Halcrow * ecryptfs_setattr 865237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 866237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 867237fead6SMichael Halcrow * 868237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 869237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 870237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 871237fead6SMichael Halcrow * 872237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 873237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 874237fead6SMichael Halcrow */ 875237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 876237fead6SMichael Halcrow { 877237fead6SMichael Halcrow int rc = 0; 878237fead6SMichael Halcrow struct dentry *lower_dentry; 8795f3ef64fSTyler Hicks struct iattr lower_ia; 880237fead6SMichael Halcrow struct inode *inode; 881237fead6SMichael Halcrow struct inode *lower_inode; 882237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 883237fead6SMichael Halcrow 8842b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 885e81f3340SHerbert Xu if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { 886e81f3340SHerbert Xu rc = ecryptfs_init_crypt_stat(crypt_stat); 887e81f3340SHerbert Xu if (rc) 888e81f3340SHerbert Xu return rc; 889e81f3340SHerbert Xu } 8902b0143b5SDavid Howells inode = d_inode(dentry); 891237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 892e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 893e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 894e36cb0b8SDavid Howells if (d_is_dir(dentry)) 895e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 896e36cb0b8SDavid Howells else if (d_is_reg(dentry) 89764ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 89864ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 899e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 900e10f281bSMichael Halcrow 901e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 902e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 9033b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 904332ab16fSTyler Hicks if (rc) { 905332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 906332ab16fSTyler Hicks goto out; 907332ab16fSTyler Hicks } 908d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 909332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 9105dda6992SMichael Halcrow if (rc) { 911e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 912e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 913e10f281bSMichael Halcrow rc = -EIO; 91425bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 915e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 91625bd8174SMichael Halcrow "or the key could not be retrieved. " 91725bd8174SMichael Halcrow "Plaintext passthrough mode is not " 918e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 919e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 920e10f281bSMichael Halcrow goto out; 921e10f281bSMichael Halcrow } 922e10f281bSMichael Halcrow rc = 0; 9233aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9243aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 925e10f281bSMichael Halcrow } 926e10f281bSMichael Halcrow } 927e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 928a261a039STyler Hicks 92931051c85SJan Kara rc = setattr_prepare(dentry, ia); 930a261a039STyler Hicks if (rc) 931a261a039STyler Hicks goto out; 932a261a039STyler Hicks if (ia->ia_valid & ATTR_SIZE) { 933a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); 934a261a039STyler Hicks if (rc) 935a261a039STyler Hicks goto out; 936a261a039STyler Hicks } 937a261a039STyler Hicks 9385f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9395f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9405f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 941237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9425f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 943237fead6SMichael Halcrow if (rc < 0) 944237fead6SMichael Halcrow goto out; 945237fead6SMichael Halcrow } 9461ac564ecSJeff Layton 9471ac564ecSJeff Layton /* 9481ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9491ac564ecSJeff Layton * to interpret this in its own way. 9501ac564ecSJeff Layton */ 9515f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9525f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9531ac564ecSJeff Layton 9545955102cSAl Viro inode_lock(d_inode(lower_dentry)); 95527ac0ffeSJ. Bruce Fields rc = notify_change(lower_dentry, &lower_ia, NULL); 9565955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 957237fead6SMichael Halcrow out: 9589afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 959237fead6SMichael Halcrow return rc; 960237fead6SMichael Halcrow } 961237fead6SMichael Halcrow 962a528d35eSDavid Howells static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat, 963a528d35eSDavid Howells u32 request_mask, unsigned int flags) 9643a60a168STyler Hicks { 965a528d35eSDavid Howells struct dentry *dentry = path->dentry; 9663a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9673a60a168STyler Hicks int rc = 0; 9683a60a168STyler Hicks 9693a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9703a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 9712b0143b5SDavid Howells generic_fillattr(d_inode(dentry), stat); 9723a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 9733a60a168STyler Hicks char *target; 9743a60a168STyler Hicks size_t targetsiz; 9753a60a168STyler Hicks 976b22e8fedSAl Viro target = ecryptfs_readlink_lower(dentry, &targetsiz); 977b22e8fedSAl Viro if (!IS_ERR(target)) { 9783a60a168STyler Hicks kfree(target); 9793a60a168STyler Hicks stat->size = targetsiz; 980b22e8fedSAl Viro } else { 981b22e8fedSAl Viro rc = PTR_ERR(target); 9823a60a168STyler Hicks } 9833a60a168STyler Hicks } 9843a60a168STyler Hicks return rc; 9853a60a168STyler Hicks } 9863a60a168STyler Hicks 987a528d35eSDavid Howells static int ecryptfs_getattr(const struct path *path, struct kstat *stat, 988a528d35eSDavid Howells u32 request_mask, unsigned int flags) 989f8f484d1STyler Hicks { 990a528d35eSDavid Howells struct dentry *dentry = path->dentry; 991f8f484d1STyler Hicks struct kstat lower_stat; 992f8f484d1STyler Hicks int rc; 993f8f484d1STyler Hicks 994a528d35eSDavid Howells rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat, 995a528d35eSDavid Howells request_mask, flags); 996f8f484d1STyler Hicks if (!rc) { 9972b0143b5SDavid Howells fsstack_copy_attr_all(d_inode(dentry), 9982b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(dentry))); 9992b0143b5SDavid Howells generic_fillattr(d_inode(dentry), stat); 1000f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 1001f8f484d1STyler Hicks } 1002f8f484d1STyler Hicks return rc; 1003f8f484d1STyler Hicks } 1004f8f484d1STyler Hicks 1005dd2a3b7aSMichael Halcrow int 10063767e255SAl Viro ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, 10073767e255SAl Viro const char *name, const void *value, 1008237fead6SMichael Halcrow size_t size, int flags) 1009237fead6SMichael Halcrow { 10105d6c3191SAndreas Gruenbacher int rc; 1011237fead6SMichael Halcrow struct dentry *lower_dentry; 1012237fead6SMichael Halcrow 1013237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10145d6c3191SAndreas Gruenbacher if (!(d_inode(lower_dentry)->i_opflags & IOP_XATTR)) { 1015cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1016237fead6SMichael Halcrow goto out; 1017237fead6SMichael Halcrow } 101848b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 10193767e255SAl Viro if (!rc && inode) 10203767e255SAl Viro fsstack_copy_attr_all(inode, d_inode(lower_dentry)); 1021237fead6SMichael Halcrow out: 1022237fead6SMichael Halcrow return rc; 1023237fead6SMichael Halcrow } 1024237fead6SMichael Halcrow 1025dd2a3b7aSMichael Halcrow ssize_t 1026ce23e640SAl Viro ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, 1027ce23e640SAl Viro const char *name, void *value, size_t size) 1028d7cdc5feSMichael Halcrow { 10295d6c3191SAndreas Gruenbacher int rc; 1030d7cdc5feSMichael Halcrow 10315d6c3191SAndreas Gruenbacher if (!(lower_inode->i_opflags & IOP_XATTR)) { 1032cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1033d7cdc5feSMichael Halcrow goto out; 1034d7cdc5feSMichael Halcrow } 1035ce23e640SAl Viro inode_lock(lower_inode); 10365d6c3191SAndreas Gruenbacher rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size); 1037ce23e640SAl Viro inode_unlock(lower_inode); 1038d7cdc5feSMichael Halcrow out: 1039d7cdc5feSMichael Halcrow return rc; 1040d7cdc5feSMichael Halcrow } 1041d7cdc5feSMichael Halcrow 10427896b631SAdrian Bunk static ssize_t 1043ce23e640SAl Viro ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, 1044ce23e640SAl Viro const char *name, void *value, size_t size) 1045237fead6SMichael Halcrow { 1046ce23e640SAl Viro return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), 1047ce23e640SAl Viro ecryptfs_inode_to_lower(inode), 1048ce23e640SAl Viro name, value, size); 1049237fead6SMichael Halcrow } 1050237fead6SMichael Halcrow 1051237fead6SMichael Halcrow static ssize_t 1052237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1053237fead6SMichael Halcrow { 1054237fead6SMichael Halcrow int rc = 0; 1055237fead6SMichael Halcrow struct dentry *lower_dentry; 1056237fead6SMichael Halcrow 1057237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10582b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->listxattr) { 1059cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1060237fead6SMichael Halcrow goto out; 1061237fead6SMichael Halcrow } 10625955102cSAl Viro inode_lock(d_inode(lower_dentry)); 10632b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); 10645955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 1065237fead6SMichael Halcrow out: 1066237fead6SMichael Halcrow return rc; 1067237fead6SMichael Halcrow } 1068237fead6SMichael Halcrow 10694b899da5SAndreas Gruenbacher static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, 10704b899da5SAndreas Gruenbacher const char *name) 1071237fead6SMichael Halcrow { 10725d6c3191SAndreas Gruenbacher int rc; 1073237fead6SMichael Halcrow struct dentry *lower_dentry; 10744b899da5SAndreas Gruenbacher struct inode *lower_inode; 1075237fead6SMichael Halcrow 1076237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10774b899da5SAndreas Gruenbacher lower_inode = ecryptfs_inode_to_lower(inode); 10785d6c3191SAndreas Gruenbacher if (!(lower_inode->i_opflags & IOP_XATTR)) { 1079cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1080237fead6SMichael Halcrow goto out; 1081237fead6SMichael Halcrow } 10824b899da5SAndreas Gruenbacher inode_lock(lower_inode); 10835d6c3191SAndreas Gruenbacher rc = __vfs_removexattr(lower_dentry, name); 10844b899da5SAndreas Gruenbacher inode_unlock(lower_inode); 1085237fead6SMichael Halcrow out: 1086237fead6SMichael Halcrow return rc; 1087237fead6SMichael Halcrow } 1088237fead6SMichael Halcrow 1089754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 10906b255391SAl Viro .get_link = ecryptfs_get_link, 1091237fead6SMichael Halcrow .permission = ecryptfs_permission, 1092237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 10933a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1094237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1095237fead6SMichael Halcrow }; 1096237fead6SMichael Halcrow 1097754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1098237fead6SMichael Halcrow .create = ecryptfs_create, 1099237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1100237fead6SMichael Halcrow .link = ecryptfs_link, 1101237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1102237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1103237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1104237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1105237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1106237fead6SMichael Halcrow .rename = ecryptfs_rename, 1107237fead6SMichael Halcrow .permission = ecryptfs_permission, 1108237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1109237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1110237fead6SMichael Halcrow }; 1111237fead6SMichael Halcrow 1112754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1113237fead6SMichael Halcrow .permission = ecryptfs_permission, 1114237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1115f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1116237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 11174b899da5SAndreas Gruenbacher }; 11184b899da5SAndreas Gruenbacher 11194b899da5SAndreas Gruenbacher static int ecryptfs_xattr_get(const struct xattr_handler *handler, 11204b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11214b899da5SAndreas Gruenbacher const char *name, void *buffer, size_t size) 11224b899da5SAndreas Gruenbacher { 11234b899da5SAndreas Gruenbacher return ecryptfs_getxattr(dentry, inode, name, buffer, size); 11244b899da5SAndreas Gruenbacher } 11254b899da5SAndreas Gruenbacher 11264b899da5SAndreas Gruenbacher static int ecryptfs_xattr_set(const struct xattr_handler *handler, 11274b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11284b899da5SAndreas Gruenbacher const char *name, const void *value, size_t size, 11294b899da5SAndreas Gruenbacher int flags) 11304b899da5SAndreas Gruenbacher { 11314b899da5SAndreas Gruenbacher if (value) 11324b899da5SAndreas Gruenbacher return ecryptfs_setxattr(dentry, inode, name, value, size, flags); 11334b899da5SAndreas Gruenbacher else { 11344b899da5SAndreas Gruenbacher BUG_ON(flags != XATTR_REPLACE); 11354b899da5SAndreas Gruenbacher return ecryptfs_removexattr(dentry, inode, name); 11364b899da5SAndreas Gruenbacher } 11374b899da5SAndreas Gruenbacher } 11384b899da5SAndreas Gruenbacher 1139c036061bSYueHaibing static const struct xattr_handler ecryptfs_xattr_handler = { 11404b899da5SAndreas Gruenbacher .prefix = "", /* match anything */ 11414b899da5SAndreas Gruenbacher .get = ecryptfs_xattr_get, 11424b899da5SAndreas Gruenbacher .set = ecryptfs_xattr_set, 11434b899da5SAndreas Gruenbacher }; 11444b899da5SAndreas Gruenbacher 11454b899da5SAndreas Gruenbacher const struct xattr_handler *ecryptfs_xattr_handlers[] = { 11464b899da5SAndreas Gruenbacher &ecryptfs_xattr_handler, 11474b899da5SAndreas Gruenbacher NULL 1148237fead6SMichael Halcrow }; 1149