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 inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); 1328bc2d3cfSTyler Hicks struct dentry *lower_dir_dentry; 1338bc2d3cfSTyler Hicks int rc; 1348bc2d3cfSTyler Hicks 1358bc2d3cfSTyler Hicks dget(lower_dentry); 1368bc2d3cfSTyler Hicks lower_dir_dentry = lock_parent(lower_dentry); 137b21996e3SJ. Bruce Fields rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); 1388bc2d3cfSTyler Hicks if (rc) { 1398bc2d3cfSTyler Hicks printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); 1408bc2d3cfSTyler Hicks goto out_unlock; 1418bc2d3cfSTyler Hicks } 1428bc2d3cfSTyler Hicks fsstack_copy_attr_times(dir, lower_dir_inode); 1438bc2d3cfSTyler Hicks set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); 1448bc2d3cfSTyler Hicks inode->i_ctime = dir->i_ctime; 1458bc2d3cfSTyler Hicks d_drop(dentry); 1468bc2d3cfSTyler Hicks out_unlock: 1478bc2d3cfSTyler Hicks unlock_dir(lower_dir_dentry); 1488bc2d3cfSTyler Hicks dput(lower_dentry); 1498bc2d3cfSTyler Hicks return rc; 1508bc2d3cfSTyler Hicks } 1518bc2d3cfSTyler Hicks 152237fead6SMichael Halcrow /** 153237fead6SMichael Halcrow * ecryptfs_do_create 154237fead6SMichael Halcrow * @directory_inode: inode of the new file's dentry's parent in ecryptfs 155237fead6SMichael Halcrow * @ecryptfs_dentry: New file's dentry in ecryptfs 156237fead6SMichael Halcrow * @mode: The mode of the new file 157237fead6SMichael Halcrow * 158237fead6SMichael Halcrow * Creates the underlying file and the eCryptfs inode which will link to 159237fead6SMichael Halcrow * it. It will also update the eCryptfs directory inode to mimic the 160237fead6SMichael Halcrow * stat of the lower directory inode. 161237fead6SMichael Halcrow * 162b59db43aSTyler Hicks * Returns the new eCryptfs inode on success; an ERR_PTR on error condition 163237fead6SMichael Halcrow */ 164b59db43aSTyler Hicks static struct inode * 165237fead6SMichael Halcrow ecryptfs_do_create(struct inode *directory_inode, 166175a4eb7SAl Viro struct dentry *ecryptfs_dentry, umode_t mode) 167237fead6SMichael Halcrow { 168237fead6SMichael Halcrow int rc; 169237fead6SMichael Halcrow struct dentry *lower_dentry; 170237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 171b59db43aSTyler Hicks struct inode *inode; 172237fead6SMichael Halcrow 173237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); 174237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 1752b0143b5SDavid Howells rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true); 1764981e081SMichael Halcrow if (rc) { 177caeeeecfSMichael Halcrow printk(KERN_ERR "%s: Failure to create dentry in lower fs; " 17818d1dbf1SHarvey Harrison "rc = [%d]\n", __func__, rc); 179b59db43aSTyler Hicks inode = ERR_PTR(rc); 180237fead6SMichael Halcrow goto out_lock; 181237fead6SMichael Halcrow } 1822b0143b5SDavid Howells inode = __ecryptfs_get_inode(d_inode(lower_dentry), 1835ccf9203STyler Hicks directory_inode->i_sb); 1848bc2d3cfSTyler Hicks if (IS_ERR(inode)) { 1852b0143b5SDavid Howells vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL); 186237fead6SMichael Halcrow goto out_lock; 1878bc2d3cfSTyler Hicks } 1882b0143b5SDavid Howells fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); 1892b0143b5SDavid Howells fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); 190237fead6SMichael Halcrow out_lock: 191237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 192b59db43aSTyler Hicks return inode; 193237fead6SMichael Halcrow } 194237fead6SMichael Halcrow 195237fead6SMichael Halcrow /** 196237fead6SMichael Halcrow * ecryptfs_initialize_file 197237fead6SMichael Halcrow * 198237fead6SMichael Halcrow * Cause the file to be changed from a basic empty file to an ecryptfs 199237fead6SMichael Halcrow * file with a header and first data page. 200237fead6SMichael Halcrow * 201237fead6SMichael Halcrow * Returns zero on success 202237fead6SMichael Halcrow */ 203e3ccaa97STyler Hicks int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, 204b59db43aSTyler Hicks struct inode *ecryptfs_inode) 205237fead6SMichael Halcrow { 206d7cdc5feSMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat = 207b59db43aSTyler Hicks &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; 208237fead6SMichael Halcrow int rc = 0; 209237fead6SMichael Halcrow 210b59db43aSTyler Hicks if (S_ISDIR(ecryptfs_inode->i_mode)) { 211237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); 212e2bd99ecSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 213d7cdc5feSMichael Halcrow goto out; 214237fead6SMichael Halcrow } 215237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); 216b59db43aSTyler Hicks rc = ecryptfs_new_file_context(ecryptfs_inode); 217237fead6SMichael Halcrow if (rc) { 218d7cdc5feSMichael Halcrow ecryptfs_printk(KERN_ERR, "Error creating new file " 219d7cdc5feSMichael Halcrow "context; rc = [%d]\n", rc); 220d7cdc5feSMichael Halcrow goto out; 221237fead6SMichael Halcrow } 222b59db43aSTyler Hicks rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); 223391b52f9SMichael Halcrow if (rc) { 224391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 225332ab16fSTyler Hicks "the lower file for the dentry with name " 2269e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2279e78d14aSDavid Howells ecryptfs_dentry, rc); 228391b52f9SMichael Halcrow goto out; 229391b52f9SMichael Halcrow } 230b59db43aSTyler Hicks rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); 231332ab16fSTyler Hicks if (rc) 232d7cdc5feSMichael Halcrow printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); 233b59db43aSTyler Hicks ecryptfs_put_lower_file(ecryptfs_inode); 234237fead6SMichael Halcrow out: 235237fead6SMichael Halcrow return rc; 236237fead6SMichael Halcrow } 237237fead6SMichael Halcrow 238237fead6SMichael Halcrow /** 239237fead6SMichael Halcrow * ecryptfs_create 240237fead6SMichael Halcrow * @dir: The inode of the directory in which to create the file. 241237fead6SMichael Halcrow * @dentry: The eCryptfs dentry 242237fead6SMichael Halcrow * @mode: The mode of the new file. 243237fead6SMichael Halcrow * 244237fead6SMichael Halcrow * Creates a new file. 245237fead6SMichael Halcrow * 246237fead6SMichael Halcrow * Returns zero on success; non-zero on error condition 247237fead6SMichael Halcrow */ 248237fead6SMichael Halcrow static int 249237fead6SMichael Halcrow ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, 250ebfc3b49SAl Viro umode_t mode, bool excl) 251237fead6SMichael Halcrow { 252b59db43aSTyler Hicks struct inode *ecryptfs_inode; 253237fead6SMichael Halcrow int rc; 254237fead6SMichael Halcrow 255b59db43aSTyler Hicks ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, 256b59db43aSTyler Hicks mode); 257a1c83681SViresh Kumar if (IS_ERR(ecryptfs_inode)) { 258237fead6SMichael Halcrow ecryptfs_printk(KERN_WARNING, "Failed to create file in" 259237fead6SMichael Halcrow "lower filesystem\n"); 260b59db43aSTyler Hicks rc = PTR_ERR(ecryptfs_inode); 261237fead6SMichael Halcrow goto out; 262237fead6SMichael Halcrow } 263237fead6SMichael Halcrow /* At this point, a file exists on "disk"; we need to make sure 264237fead6SMichael Halcrow * that this on disk file is prepared to be an ecryptfs file */ 265b59db43aSTyler Hicks rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); 266b59db43aSTyler Hicks if (rc) { 2678bc2d3cfSTyler Hicks ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, 2688bc2d3cfSTyler Hicks ecryptfs_inode); 2690e81ba23SAl Viro iget_failed(ecryptfs_inode); 270b59db43aSTyler Hicks goto out; 271b59db43aSTyler Hicks } 2721e2e547aSAl Viro d_instantiate_new(ecryptfs_dentry, ecryptfs_inode); 273237fead6SMichael Halcrow out: 274237fead6SMichael Halcrow return rc; 275237fead6SMichael Halcrow } 276237fead6SMichael Halcrow 277778aeb42STyler Hicks static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) 278237fead6SMichael Halcrow { 2792aac0cf8STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 280778aeb42STyler Hicks int rc; 281237fead6SMichael Halcrow 282778aeb42STyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 283391b52f9SMichael Halcrow if (rc) { 284391b52f9SMichael Halcrow printk(KERN_ERR "%s: Error attempting to initialize " 285332ab16fSTyler Hicks "the lower file for the dentry with name " 2869e78d14aSDavid Howells "[%pd]; rc = [%d]\n", __func__, 2879e78d14aSDavid Howells dentry, rc); 288778aeb42STyler Hicks return rc; 289391b52f9SMichael Halcrow } 290778aeb42STyler Hicks 2913b06b3ebSTyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 2922aac0cf8STyler Hicks /* TODO: lock for crypt_stat comparison */ 2932aac0cf8STyler Hicks if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) 2942aac0cf8STyler Hicks ecryptfs_set_default_sizes(crypt_stat); 295778aeb42STyler Hicks 296778aeb42STyler Hicks rc = ecryptfs_read_and_validate_header_region(inode); 297778aeb42STyler Hicks ecryptfs_put_lower_file(inode); 298237fead6SMichael Halcrow if (rc) { 299778aeb42STyler Hicks rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); 300778aeb42STyler Hicks if (!rc) 301dd2a3b7aSMichael Halcrow crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; 302dd2a3b7aSMichael Halcrow } 303778aeb42STyler Hicks 304778aeb42STyler Hicks /* Must return 0 to allow non-eCryptfs files to be looked up, too */ 305778aeb42STyler Hicks return 0; 306778aeb42STyler Hicks } 307778aeb42STyler Hicks 308778aeb42STyler Hicks /** 309778aeb42STyler Hicks * ecryptfs_lookup_interpose - Dentry interposition for a lookup 310778aeb42STyler Hicks */ 311b1168a92SAl Viro static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, 312b1168a92SAl Viro struct dentry *lower_dentry) 313778aeb42STyler Hicks { 3142b0143b5SDavid Howells struct inode *inode, *lower_inode = d_inode(lower_dentry); 315778aeb42STyler Hicks struct ecryptfs_dentry_info *dentry_info; 316778aeb42STyler Hicks struct vfsmount *lower_mnt; 317778aeb42STyler Hicks int rc = 0; 318778aeb42STyler Hicks 319778aeb42STyler Hicks dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); 320778aeb42STyler Hicks if (!dentry_info) { 321237fead6SMichael Halcrow dput(lower_dentry); 322b1168a92SAl Viro return ERR_PTR(-ENOMEM); 323778aeb42STyler Hicks } 3240b1d9011SAl Viro 3250b1d9011SAl Viro lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); 326b1168a92SAl Viro fsstack_copy_attr_atime(d_inode(dentry->d_parent), 327b1168a92SAl Viro d_inode(lower_dentry->d_parent)); 32884d08fa8SAl Viro BUG_ON(!d_count(lower_dentry)); 3290b1d9011SAl Viro 3300b1d9011SAl Viro ecryptfs_set_dentry_private(dentry, dentry_info); 33192dd1230SAl Viro dentry_info->lower_path.mnt = lower_mnt; 33292dd1230SAl Viro dentry_info->lower_path.dentry = lower_dentry; 333778aeb42STyler Hicks 3342b0143b5SDavid Howells if (d_really_is_negative(lower_dentry)) { 335778aeb42STyler Hicks /* We want to add because we couldn't find in lower */ 336778aeb42STyler Hicks d_add(dentry, NULL); 337b1168a92SAl Viro return NULL; 338778aeb42STyler Hicks } 339b1168a92SAl Viro inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb); 340778aeb42STyler Hicks if (IS_ERR(inode)) { 341778aeb42STyler Hicks printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", 342778aeb42STyler Hicks __func__, PTR_ERR(inode)); 343b1168a92SAl Viro return ERR_CAST(inode); 344778aeb42STyler Hicks } 345778aeb42STyler Hicks if (S_ISREG(inode->i_mode)) { 346778aeb42STyler Hicks rc = ecryptfs_i_size_read(dentry, inode); 347778aeb42STyler Hicks if (rc) { 348778aeb42STyler Hicks make_bad_inode(inode); 349b1168a92SAl Viro return ERR_PTR(rc); 350778aeb42STyler Hicks } 351778aeb42STyler Hicks } 352778aeb42STyler Hicks 353778aeb42STyler Hicks if (inode->i_state & I_NEW) 354778aeb42STyler Hicks unlock_new_inode(inode); 355b1168a92SAl Viro return d_splice_alias(inode, dentry); 356addd65adSMichael Halcrow } 357addd65adSMichael Halcrow 358addd65adSMichael Halcrow /** 359addd65adSMichael Halcrow * ecryptfs_lookup 360addd65adSMichael Halcrow * @ecryptfs_dir_inode: The eCryptfs directory inode 361addd65adSMichael Halcrow * @ecryptfs_dentry: The eCryptfs dentry that we are looking up 36289076bc3SAl Viro * @flags: lookup flags 363addd65adSMichael Halcrow * 364addd65adSMichael Halcrow * Find a file on disk. If the file does not exist, then we'll add it to the 365addd65adSMichael Halcrow * dentry cache and continue on to read it from the disk. 366addd65adSMichael Halcrow */ 367addd65adSMichael Halcrow static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, 368addd65adSMichael Halcrow struct dentry *ecryptfs_dentry, 36900cd8dd3SAl Viro unsigned int flags) 370addd65adSMichael Halcrow { 371addd65adSMichael Halcrow char *encrypted_and_encoded_name = NULL; 37288ae4ab9SAl Viro struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 373addd65adSMichael Halcrow struct dentry *lower_dir_dentry, *lower_dentry; 37488ae4ab9SAl Viro const char *name = ecryptfs_dentry->d_name.name; 37588ae4ab9SAl Viro size_t len = ecryptfs_dentry->d_name.len; 376b1168a92SAl Viro struct dentry *res; 377addd65adSMichael Halcrow int rc = 0; 378addd65adSMichael Halcrow 379addd65adSMichael Halcrow lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); 38088ae4ab9SAl Viro 381addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 382addd65adSMichael Halcrow ecryptfs_dentry->d_sb)->mount_crypt_stat; 383ab13a921SGuenter Roeck if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 384addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename( 38588ae4ab9SAl Viro &encrypted_and_encoded_name, &len, 38688ae4ab9SAl Viro mount_crypt_stat, name, len); 387addd65adSMichael Halcrow if (rc) { 388addd65adSMichael Halcrow printk(KERN_ERR "%s: Error attempting to encrypt and encode " 389addd65adSMichael Halcrow "filename; rc = [%d]\n", __func__, rc); 390237fead6SMichael Halcrow return ERR_PTR(rc); 391237fead6SMichael Halcrow } 39288ae4ab9SAl Viro name = encrypted_and_encoded_name; 39388ae4ab9SAl Viro } 39488ae4ab9SAl Viro 39588ae4ab9SAl Viro lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); 396237fead6SMichael Halcrow if (IS_ERR(lower_dentry)) { 397237fead6SMichael Halcrow ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " 398b1168a92SAl Viro "[%ld] on lower_dentry = [%s]\n", __func__, 399b1168a92SAl Viro PTR_ERR(lower_dentry), 40088ae4ab9SAl Viro name); 401b1168a92SAl Viro res = ERR_CAST(lower_dentry); 40288ae4ab9SAl Viro } else { 403b1168a92SAl Viro res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); 40488ae4ab9SAl Viro } 405237fead6SMichael Halcrow kfree(encrypted_and_encoded_name); 406b1168a92SAl Viro return res; 407237fead6SMichael Halcrow } 408237fead6SMichael Halcrow 409237fead6SMichael Halcrow static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, 410237fead6SMichael Halcrow struct dentry *new_dentry) 411237fead6SMichael Halcrow { 412237fead6SMichael Halcrow struct dentry *lower_old_dentry; 413237fead6SMichael Halcrow struct dentry *lower_new_dentry; 414237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 415237fead6SMichael Halcrow u64 file_size_save; 416237fead6SMichael Halcrow int rc; 417237fead6SMichael Halcrow 4182b0143b5SDavid Howells file_size_save = i_size_read(d_inode(old_dentry)); 419237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 420237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 421237fead6SMichael Halcrow dget(lower_old_dentry); 422237fead6SMichael Halcrow dget(lower_new_dentry); 423237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_new_dentry); 4242b0143b5SDavid Howells rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), 425146a8595SJ. Bruce Fields lower_new_dentry, NULL); 4262b0143b5SDavid Howells if (rc || d_really_is_negative(lower_new_dentry)) 427237fead6SMichael Halcrow goto out_lock; 4285ccf9203STyler Hicks rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); 429237fead6SMichael Halcrow if (rc) 430237fead6SMichael Halcrow goto out_lock; 4312b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 4322b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 4332b0143b5SDavid Howells set_nlink(d_inode(old_dentry), 4342b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); 4352b0143b5SDavid Howells i_size_write(d_inode(new_dentry), file_size_save); 436237fead6SMichael Halcrow out_lock: 437237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 438237fead6SMichael Halcrow dput(lower_new_dentry); 439237fead6SMichael Halcrow dput(lower_old_dentry); 440237fead6SMichael Halcrow return rc; 441237fead6SMichael Halcrow } 442237fead6SMichael Halcrow 443237fead6SMichael Halcrow static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) 444237fead6SMichael Halcrow { 4452b0143b5SDavid Howells return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); 446237fead6SMichael Halcrow } 447237fead6SMichael Halcrow 448237fead6SMichael Halcrow static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, 449237fead6SMichael Halcrow const char *symname) 450237fead6SMichael Halcrow { 451237fead6SMichael Halcrow int rc; 452237fead6SMichael Halcrow struct dentry *lower_dentry; 453237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 454237fead6SMichael Halcrow char *encoded_symname; 455addd65adSMichael Halcrow size_t encoded_symlen; 456addd65adSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; 457237fead6SMichael Halcrow 458237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 459237fead6SMichael Halcrow dget(lower_dentry); 460237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 461addd65adSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 462addd65adSMichael Halcrow dir->i_sb)->mount_crypt_stat; 463addd65adSMichael Halcrow rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, 464addd65adSMichael Halcrow &encoded_symlen, 465addd65adSMichael Halcrow mount_crypt_stat, symname, 466addd65adSMichael Halcrow strlen(symname)); 467addd65adSMichael Halcrow if (rc) 468237fead6SMichael Halcrow goto out_lock; 4692b0143b5SDavid Howells rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry, 470db2e747bSMiklos Szeredi encoded_symname); 471237fead6SMichael Halcrow kfree(encoded_symname); 4722b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 473237fead6SMichael Halcrow goto out_lock; 4745ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 475237fead6SMichael Halcrow if (rc) 476237fead6SMichael Halcrow goto out_lock; 4772b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 4782b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 479237fead6SMichael Halcrow out_lock: 480237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 481237fead6SMichael Halcrow dput(lower_dentry); 4822b0143b5SDavid Howells if (d_really_is_negative(dentry)) 483237fead6SMichael Halcrow d_drop(dentry); 484237fead6SMichael Halcrow return rc; 485237fead6SMichael Halcrow } 486237fead6SMichael Halcrow 48718bb1db3SAl Viro static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 488237fead6SMichael Halcrow { 489237fead6SMichael Halcrow int rc; 490237fead6SMichael Halcrow struct dentry *lower_dentry; 491237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 492237fead6SMichael Halcrow 493237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 494237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 4952b0143b5SDavid Howells rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode); 4962b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 497237fead6SMichael Halcrow goto out; 4985ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 499237fead6SMichael Halcrow if (rc) 500237fead6SMichael Halcrow goto out; 5012b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5022b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 5032b0143b5SDavid Howells set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); 504237fead6SMichael Halcrow out: 505237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5062b0143b5SDavid Howells if (d_really_is_negative(dentry)) 507237fead6SMichael Halcrow d_drop(dentry); 508237fead6SMichael Halcrow return rc; 509237fead6SMichael Halcrow } 510237fead6SMichael Halcrow 511237fead6SMichael Halcrow static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) 512237fead6SMichael Halcrow { 513237fead6SMichael Halcrow struct dentry *lower_dentry; 514237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 51545ec4abaSMichael Halcrow int rc; 516237fead6SMichael Halcrow 517237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 51845ec4abaSMichael Halcrow dget(dentry); 519237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 52045ec4abaSMichael Halcrow dget(lower_dentry); 5212b0143b5SDavid Howells rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry); 52245ec4abaSMichael Halcrow dput(lower_dentry); 5232b0143b5SDavid Howells if (!rc && d_really_is_positive(dentry)) 5242b0143b5SDavid Howells clear_nlink(d_inode(dentry)); 5252b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5262b0143b5SDavid Howells set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); 527237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 528237fead6SMichael Halcrow if (!rc) 529237fead6SMichael Halcrow d_drop(dentry); 53045ec4abaSMichael Halcrow dput(dentry); 531237fead6SMichael Halcrow return rc; 532237fead6SMichael Halcrow } 533237fead6SMichael Halcrow 534237fead6SMichael Halcrow static int 5351a67aafbSAl Viro ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) 536237fead6SMichael Halcrow { 537237fead6SMichael Halcrow int rc; 538237fead6SMichael Halcrow struct dentry *lower_dentry; 539237fead6SMichael Halcrow struct dentry *lower_dir_dentry; 540237fead6SMichael Halcrow 541237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 542237fead6SMichael Halcrow lower_dir_dentry = lock_parent(lower_dentry); 5432b0143b5SDavid Howells rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev); 5442b0143b5SDavid Howells if (rc || d_really_is_negative(lower_dentry)) 545237fead6SMichael Halcrow goto out; 5465ccf9203STyler Hicks rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); 547237fead6SMichael Halcrow if (rc) 548237fead6SMichael Halcrow goto out; 5492b0143b5SDavid Howells fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); 5502b0143b5SDavid Howells fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); 551237fead6SMichael Halcrow out: 552237fead6SMichael Halcrow unlock_dir(lower_dir_dentry); 5532b0143b5SDavid Howells if (d_really_is_negative(dentry)) 554237fead6SMichael Halcrow d_drop(dentry); 555237fead6SMichael Halcrow return rc; 556237fead6SMichael Halcrow } 557237fead6SMichael Halcrow 558237fead6SMichael Halcrow static int 559237fead6SMichael Halcrow ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, 5601cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 5611cd66c93SMiklos Szeredi unsigned int flags) 562237fead6SMichael Halcrow { 563237fead6SMichael Halcrow int rc; 564237fead6SMichael Halcrow struct dentry *lower_old_dentry; 565237fead6SMichael Halcrow struct dentry *lower_new_dentry; 566237fead6SMichael Halcrow struct dentry *lower_old_dir_dentry; 567237fead6SMichael Halcrow struct dentry *lower_new_dir_dentry; 5680d132f73SErez Zadok struct dentry *trap = NULL; 5698335eafcSTyler Hicks struct inode *target_inode; 570237fead6SMichael Halcrow 5711cd66c93SMiklos Szeredi if (flags) 5721cd66c93SMiklos Szeredi return -EINVAL; 5731cd66c93SMiklos Szeredi 574237fead6SMichael Halcrow lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); 575237fead6SMichael Halcrow lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); 576237fead6SMichael Halcrow dget(lower_old_dentry); 577237fead6SMichael Halcrow dget(lower_new_dentry); 578237fead6SMichael Halcrow lower_old_dir_dentry = dget_parent(lower_old_dentry); 579237fead6SMichael Halcrow lower_new_dir_dentry = dget_parent(lower_new_dentry); 5802b0143b5SDavid Howells target_inode = d_inode(new_dentry); 5810d132f73SErez Zadok trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 5820d132f73SErez Zadok rc = -EINVAL; 58374dd7c97SAl Viro if (lower_old_dentry->d_parent != lower_old_dir_dentry) 5840d132f73SErez Zadok goto out_lock; 58574dd7c97SAl Viro if (lower_new_dentry->d_parent != lower_new_dir_dentry) 58674dd7c97SAl Viro goto out_lock; 58774dd7c97SAl Viro if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry)) 58874dd7c97SAl Viro goto out_lock; 58974dd7c97SAl Viro /* source should not be ancestor of target */ 59074dd7c97SAl Viro if (trap == lower_old_dentry) 59174dd7c97SAl Viro goto out_lock; 5920d132f73SErez Zadok /* target should not be ancestor of source */ 5930d132f73SErez Zadok if (trap == lower_new_dentry) { 5940d132f73SErez Zadok rc = -ENOTEMPTY; 5950d132f73SErez Zadok goto out_lock; 5960d132f73SErez Zadok } 5972b0143b5SDavid Howells rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, 5982b0143b5SDavid Howells d_inode(lower_new_dir_dentry), lower_new_dentry, 599520c8b16SMiklos Szeredi NULL, 0); 600237fead6SMichael Halcrow if (rc) 601237fead6SMichael Halcrow goto out_lock; 6028335eafcSTyler Hicks if (target_inode) 6038335eafcSTyler Hicks fsstack_copy_attr_all(target_inode, 6048335eafcSTyler Hicks ecryptfs_inode_to_lower(target_inode)); 6052b0143b5SDavid Howells fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); 606237fead6SMichael Halcrow if (new_dir != old_dir) 6072b0143b5SDavid Howells fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); 608237fead6SMichael Halcrow out_lock: 609237fead6SMichael Halcrow unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); 610dd55c898STyler Hicks dput(lower_new_dir_dentry); 611dd55c898STyler Hicks dput(lower_old_dir_dentry); 612237fead6SMichael Halcrow dput(lower_new_dentry); 613237fead6SMichael Halcrow dput(lower_old_dentry); 614237fead6SMichael Halcrow return rc; 615237fead6SMichael Halcrow } 616237fead6SMichael Halcrow 617b22e8fedSAl Viro static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) 618237fead6SMichael Halcrow { 6196c988f57SMiklos Szeredi DEFINE_DELAYED_CALL(done); 6203a60a168STyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 6216c988f57SMiklos Szeredi const char *link; 622b22e8fedSAl Viro char *buf; 623addd65adSMichael Halcrow int rc; 624237fead6SMichael Halcrow 6256c988f57SMiklos Szeredi link = vfs_get_link(lower_dentry, &done); 6266c988f57SMiklos Szeredi if (IS_ERR(link)) 6276c988f57SMiklos Szeredi return ERR_CAST(link); 6286c988f57SMiklos Szeredi 629b22e8fedSAl Viro rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, 6306c988f57SMiklos Szeredi link, strlen(link)); 6316c988f57SMiklos Szeredi do_delayed_call(&done); 6326c988f57SMiklos Szeredi if (rc) 6336c988f57SMiklos Szeredi return ERR_PTR(rc); 6346c988f57SMiklos Szeredi 6356c988f57SMiklos Szeredi return buf; 6363a60a168STyler Hicks } 6373a60a168STyler Hicks 6386b255391SAl Viro static const char *ecryptfs_get_link(struct dentry *dentry, 639fceef393SAl Viro struct inode *inode, 640fceef393SAl Viro struct delayed_call *done) 641237fead6SMichael Halcrow { 642b22e8fedSAl Viro size_t len; 6436b255391SAl Viro char *buf; 6446b255391SAl Viro 6456b255391SAl Viro if (!dentry) 6466b255391SAl Viro return ERR_PTR(-ECHILD); 6476b255391SAl Viro 6486b255391SAl Viro buf = ecryptfs_readlink_lower(dentry, &len); 649b22e8fedSAl Viro if (IS_ERR(buf)) 650680baacbSAl Viro return buf; 6512b0143b5SDavid Howells fsstack_copy_attr_atime(d_inode(dentry), 6522b0143b5SDavid Howells d_inode(ecryptfs_dentry_to_lower(dentry))); 653408bd629SAl Viro buf[len] = '\0'; 654fceef393SAl Viro set_delayed_call(done, kfree_link, buf); 655fceef393SAl Viro return buf; 656237fead6SMichael Halcrow } 657237fead6SMichael Halcrow 658237fead6SMichael Halcrow /** 659237fead6SMichael Halcrow * upper_size_to_lower_size 660237fead6SMichael Halcrow * @crypt_stat: Crypt_stat associated with file 661237fead6SMichael Halcrow * @upper_size: Size of the upper file 662237fead6SMichael Halcrow * 663cc11beffSMichael Halcrow * Calculate the required size of the lower file based on the 664237fead6SMichael Halcrow * specified size of the upper file. This calculation is based on the 665237fead6SMichael Halcrow * number of headers in the underlying file and the extent size. 666237fead6SMichael Halcrow * 667237fead6SMichael Halcrow * Returns Calculated size of the lower file. 668237fead6SMichael Halcrow */ 669237fead6SMichael Halcrow static loff_t 670237fead6SMichael Halcrow upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, 671237fead6SMichael Halcrow loff_t upper_size) 672237fead6SMichael Halcrow { 673237fead6SMichael Halcrow loff_t lower_size; 674237fead6SMichael Halcrow 675157f1071STyler Hicks lower_size = ecryptfs_lower_header_size(crypt_stat); 676237fead6SMichael Halcrow if (upper_size != 0) { 677237fead6SMichael Halcrow loff_t num_extents; 678237fead6SMichael Halcrow 679237fead6SMichael Halcrow num_extents = upper_size >> crypt_stat->extent_shift; 680237fead6SMichael Halcrow if (upper_size & ~crypt_stat->extent_mask) 681237fead6SMichael Halcrow num_extents++; 682237fead6SMichael Halcrow lower_size += (num_extents * crypt_stat->extent_size); 683237fead6SMichael Halcrow } 684237fead6SMichael Halcrow return lower_size; 685237fead6SMichael Halcrow } 686237fead6SMichael Halcrow 687237fead6SMichael Halcrow /** 6885f3ef64fSTyler Hicks * truncate_upper 689237fead6SMichael Halcrow * @dentry: The ecryptfs layer dentry 6905f3ef64fSTyler Hicks * @ia: Address of the ecryptfs inode's attributes 6915f3ef64fSTyler Hicks * @lower_ia: Address of the lower inode's attributes 692237fead6SMichael Halcrow * 693237fead6SMichael Halcrow * Function to handle truncations modifying the size of the file. Note 694237fead6SMichael Halcrow * that the file sizes are interpolated. When expanding, we are simply 6955f3ef64fSTyler Hicks * writing strings of 0's out. When truncating, we truncate the upper 6965f3ef64fSTyler Hicks * inode and update the lower_ia according to the page index 6975f3ef64fSTyler Hicks * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, 6985f3ef64fSTyler Hicks * the caller must use lower_ia in a call to notify_change() to perform 6995f3ef64fSTyler Hicks * the truncation of the lower inode. 700237fead6SMichael Halcrow * 701237fead6SMichael Halcrow * Returns zero on success; non-zero otherwise 702237fead6SMichael Halcrow */ 7035f3ef64fSTyler Hicks static int truncate_upper(struct dentry *dentry, struct iattr *ia, 7045f3ef64fSTyler Hicks struct iattr *lower_ia) 705237fead6SMichael Halcrow { 706237fead6SMichael Halcrow int rc = 0; 7072b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 708237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 709237fead6SMichael Halcrow loff_t i_size = i_size_read(inode); 710237fead6SMichael Halcrow loff_t lower_size_before_truncate; 711237fead6SMichael Halcrow loff_t lower_size_after_truncate; 712237fead6SMichael Halcrow 7135f3ef64fSTyler Hicks if (unlikely((ia->ia_size == i_size))) { 7145f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 715332ab16fSTyler Hicks return 0; 7165f3ef64fSTyler Hicks } 7173b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 718332ab16fSTyler Hicks if (rc) 719332ab16fSTyler Hicks return rc; 7202b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 721237fead6SMichael Halcrow /* Switch on growing or shrinking file */ 7225f3ef64fSTyler Hicks if (ia->ia_size > i_size) { 7232ed92554SMichael Halcrow char zero[] = { 0x00 }; 724240e2df5SMichael Halcrow 7255f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 7262ed92554SMichael Halcrow /* Write a single 0 at the last position of the file; 7272ed92554SMichael Halcrow * this triggers code that will fill in 0's throughout 7282ed92554SMichael Halcrow * the intermediate portion of the previous end of the 7292ed92554SMichael Halcrow * file and the new and of the file */ 73048c1e44aSAl Viro rc = ecryptfs_write(inode, zero, 7315f3ef64fSTyler Hicks (ia->ia_size - 1), 1); 7325f3ef64fSTyler Hicks } else { /* ia->ia_size < i_size_read(inode) */ 7335f3ef64fSTyler Hicks /* We're chopping off all the pages down to the page 7345f3ef64fSTyler Hicks * in which ia->ia_size is located. Fill in the end of 735ea1754a0SKirill A. Shutemov * that page from (ia->ia_size & ~PAGE_MASK) to 736ea1754a0SKirill A. Shutemov * PAGE_SIZE with zeros. */ 73709cbfeafSKirill A. Shutemov size_t num_zeros = (PAGE_SIZE 73809cbfeafSKirill A. Shutemov - (ia->ia_size & ~PAGE_MASK)); 7392ed92554SMichael Halcrow 7402c27c65eSChristoph Hellwig if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { 7412c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7425f3ef64fSTyler Hicks lower_ia->ia_size = ia->ia_size; 7435f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 74448c1e44aSAl Viro goto out; 74513a791b4STyler Hicks } 7462ed92554SMichael Halcrow if (num_zeros) { 7472ed92554SMichael Halcrow char *zeros_virt; 7482ed92554SMichael Halcrow 7492ed92554SMichael Halcrow zeros_virt = kzalloc(num_zeros, GFP_KERNEL); 7502ed92554SMichael Halcrow if (!zeros_virt) { 7512ed92554SMichael Halcrow rc = -ENOMEM; 75248c1e44aSAl Viro goto out; 753240e2df5SMichael Halcrow } 75448c1e44aSAl Viro rc = ecryptfs_write(inode, zeros_virt, 7555f3ef64fSTyler Hicks ia->ia_size, num_zeros); 7562ed92554SMichael Halcrow kfree(zeros_virt); 7575dda6992SMichael Halcrow if (rc) { 758240e2df5SMichael Halcrow printk(KERN_ERR "Error attempting to zero out " 759240e2df5SMichael Halcrow "the remainder of the end page on " 760240e2df5SMichael Halcrow "reducing truncate; rc = [%d]\n", rc); 76148c1e44aSAl Viro goto out; 762240e2df5SMichael Halcrow } 763240e2df5SMichael Halcrow } 7642c27c65eSChristoph Hellwig truncate_setsize(inode, ia->ia_size); 7650216f7f7SMichael Halcrow rc = ecryptfs_write_inode_size_to_metadata(inode); 766dd2a3b7aSMichael Halcrow if (rc) { 767dd2a3b7aSMichael Halcrow printk(KERN_ERR "Problem with " 768dd2a3b7aSMichael Halcrow "ecryptfs_write_inode_size_to_metadata; " 769dd2a3b7aSMichael Halcrow "rc = [%d]\n", rc); 77048c1e44aSAl Viro goto out; 771dd2a3b7aSMichael Halcrow } 772237fead6SMichael Halcrow /* We are reducing the size of the ecryptfs file, and need to 773237fead6SMichael Halcrow * know if we need to reduce the size of the lower file. */ 774237fead6SMichael Halcrow lower_size_before_truncate = 775237fead6SMichael Halcrow upper_size_to_lower_size(crypt_stat, i_size); 776237fead6SMichael Halcrow lower_size_after_truncate = 7775f3ef64fSTyler Hicks upper_size_to_lower_size(crypt_stat, ia->ia_size); 7785f3ef64fSTyler Hicks if (lower_size_after_truncate < lower_size_before_truncate) { 7795f3ef64fSTyler Hicks lower_ia->ia_size = lower_size_after_truncate; 7805f3ef64fSTyler Hicks lower_ia->ia_valid |= ATTR_SIZE; 7815f3ef64fSTyler Hicks } else 7825f3ef64fSTyler Hicks lower_ia->ia_valid &= ~ATTR_SIZE; 783237fead6SMichael Halcrow } 784237fead6SMichael Halcrow out: 785332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 786237fead6SMichael Halcrow return rc; 787237fead6SMichael Halcrow } 788237fead6SMichael Halcrow 789a261a039STyler Hicks static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) 790a261a039STyler Hicks { 791a261a039STyler Hicks struct ecryptfs_crypt_stat *crypt_stat; 792a261a039STyler Hicks loff_t lower_oldsize, lower_newsize; 793a261a039STyler Hicks 794a261a039STyler Hicks crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; 795a261a039STyler Hicks lower_oldsize = upper_size_to_lower_size(crypt_stat, 796a261a039STyler Hicks i_size_read(inode)); 797a261a039STyler Hicks lower_newsize = upper_size_to_lower_size(crypt_stat, offset); 798a261a039STyler Hicks if (lower_newsize > lower_oldsize) { 799a261a039STyler Hicks /* 800a261a039STyler Hicks * The eCryptfs inode and the new *lower* size are mixed here 801a261a039STyler Hicks * because we may not have the lower i_mutex held and/or it may 802a261a039STyler Hicks * not be appropriate to call inode_newsize_ok() with inodes 803a261a039STyler Hicks * from other filesystems. 804a261a039STyler Hicks */ 805a261a039STyler Hicks return inode_newsize_ok(inode, lower_newsize); 806a261a039STyler Hicks } 807a261a039STyler Hicks 808a261a039STyler Hicks return 0; 809a261a039STyler Hicks } 810a261a039STyler Hicks 8115f3ef64fSTyler Hicks /** 8125f3ef64fSTyler Hicks * ecryptfs_truncate 8135f3ef64fSTyler Hicks * @dentry: The ecryptfs layer dentry 8145f3ef64fSTyler Hicks * @new_length: The length to expand the file to 8155f3ef64fSTyler Hicks * 8165f3ef64fSTyler Hicks * Simple function that handles the truncation of an eCryptfs inode and 8175f3ef64fSTyler Hicks * its corresponding lower inode. 8185f3ef64fSTyler Hicks * 8195f3ef64fSTyler Hicks * Returns zero on success; non-zero otherwise 8205f3ef64fSTyler Hicks */ 8215f3ef64fSTyler Hicks int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) 8225f3ef64fSTyler Hicks { 8235f3ef64fSTyler Hicks struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; 8245f3ef64fSTyler Hicks struct iattr lower_ia = { .ia_valid = 0 }; 8255f3ef64fSTyler Hicks int rc; 8265f3ef64fSTyler Hicks 8272b0143b5SDavid Howells rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); 828a261a039STyler Hicks if (rc) 829a261a039STyler Hicks return rc; 830a261a039STyler Hicks 8315f3ef64fSTyler Hicks rc = truncate_upper(dentry, &ia, &lower_ia); 8325f3ef64fSTyler Hicks if (!rc && lower_ia.ia_valid & ATTR_SIZE) { 8335f3ef64fSTyler Hicks struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); 8345f3ef64fSTyler Hicks 8355955102cSAl Viro inode_lock(d_inode(lower_dentry)); 83627ac0ffeSJ. Bruce Fields rc = notify_change(lower_dentry, &lower_ia, NULL); 8375955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 8385f3ef64fSTyler Hicks } 8395f3ef64fSTyler Hicks return rc; 8405f3ef64fSTyler Hicks } 8415f3ef64fSTyler Hicks 842237fead6SMichael Halcrow static int 84310556cb2SAl Viro ecryptfs_permission(struct inode *inode, int mask) 844237fead6SMichael Halcrow { 845f419a2e3SAl Viro return inode_permission(ecryptfs_inode_to_lower(inode), mask); 846237fead6SMichael Halcrow } 847237fead6SMichael Halcrow 848237fead6SMichael Halcrow /** 849237fead6SMichael Halcrow * ecryptfs_setattr 850237fead6SMichael Halcrow * @dentry: dentry handle to the inode to modify 851237fead6SMichael Halcrow * @ia: Structure with flags of what to change and values 852237fead6SMichael Halcrow * 853237fead6SMichael Halcrow * Updates the metadata of an inode. If the update is to the size 854237fead6SMichael Halcrow * i.e. truncation, then ecryptfs_truncate will handle the size modification 855237fead6SMichael Halcrow * of both the ecryptfs inode and the lower inode. 856237fead6SMichael Halcrow * 857237fead6SMichael Halcrow * All other metadata changes will be passed right to the lower filesystem, 858237fead6SMichael Halcrow * and we will just update our inode to look like the lower. 859237fead6SMichael Halcrow */ 860237fead6SMichael Halcrow static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) 861237fead6SMichael Halcrow { 862237fead6SMichael Halcrow int rc = 0; 863237fead6SMichael Halcrow struct dentry *lower_dentry; 8645f3ef64fSTyler Hicks struct iattr lower_ia; 865237fead6SMichael Halcrow struct inode *inode; 866237fead6SMichael Halcrow struct inode *lower_inode; 867237fead6SMichael Halcrow struct ecryptfs_crypt_stat *crypt_stat; 868237fead6SMichael Halcrow 8692b0143b5SDavid Howells crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; 870e81f3340SHerbert Xu if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { 871e81f3340SHerbert Xu rc = ecryptfs_init_crypt_stat(crypt_stat); 872e81f3340SHerbert Xu if (rc) 873e81f3340SHerbert Xu return rc; 874e81f3340SHerbert Xu } 8752b0143b5SDavid Howells inode = d_inode(dentry); 876237fead6SMichael Halcrow lower_inode = ecryptfs_inode_to_lower(inode); 877e10f281bSMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 878e10f281bSMichael Halcrow mutex_lock(&crypt_stat->cs_mutex); 879e36cb0b8SDavid Howells if (d_is_dir(dentry)) 880e10f281bSMichael Halcrow crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); 881e36cb0b8SDavid Howells else if (d_is_reg(dentry) 88264ee4808SMichael Halcrow && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) 88364ee4808SMichael Halcrow || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { 884e10f281bSMichael Halcrow struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 885e10f281bSMichael Halcrow 886e10f281bSMichael Halcrow mount_crypt_stat = &ecryptfs_superblock_to_private( 887e10f281bSMichael Halcrow dentry->d_sb)->mount_crypt_stat; 8883b06b3ebSTyler Hicks rc = ecryptfs_get_lower_file(dentry, inode); 889332ab16fSTyler Hicks if (rc) { 890332ab16fSTyler Hicks mutex_unlock(&crypt_stat->cs_mutex); 891332ab16fSTyler Hicks goto out; 892332ab16fSTyler Hicks } 893d7cdc5feSMichael Halcrow rc = ecryptfs_read_metadata(dentry); 894332ab16fSTyler Hicks ecryptfs_put_lower_file(inode); 8955dda6992SMichael Halcrow if (rc) { 896e10f281bSMichael Halcrow if (!(mount_crypt_stat->flags 897e10f281bSMichael Halcrow & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { 898e10f281bSMichael Halcrow rc = -EIO; 89925bd8174SMichael Halcrow printk(KERN_WARNING "Either the lower file " 900e10f281bSMichael Halcrow "is not in a valid eCryptfs format, " 90125bd8174SMichael Halcrow "or the key could not be retrieved. " 90225bd8174SMichael Halcrow "Plaintext passthrough mode is not " 903e10f281bSMichael Halcrow "enabled; returning -EIO\n"); 904e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 905e10f281bSMichael Halcrow goto out; 906e10f281bSMichael Halcrow } 907e10f281bSMichael Halcrow rc = 0; 9083aeb86eaSTyler Hicks crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED 9093aeb86eaSTyler Hicks | ECRYPTFS_ENCRYPTED); 910e10f281bSMichael Halcrow } 911e10f281bSMichael Halcrow } 912e10f281bSMichael Halcrow mutex_unlock(&crypt_stat->cs_mutex); 913a261a039STyler Hicks 91431051c85SJan Kara rc = setattr_prepare(dentry, ia); 915a261a039STyler Hicks if (rc) 916a261a039STyler Hicks goto out; 917a261a039STyler Hicks if (ia->ia_valid & ATTR_SIZE) { 918a261a039STyler Hicks rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); 919a261a039STyler Hicks if (rc) 920a261a039STyler Hicks goto out; 921a261a039STyler Hicks } 922a261a039STyler Hicks 9235f3ef64fSTyler Hicks memcpy(&lower_ia, ia, sizeof(lower_ia)); 9245f3ef64fSTyler Hicks if (ia->ia_valid & ATTR_FILE) 9255f3ef64fSTyler Hicks lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); 926237fead6SMichael Halcrow if (ia->ia_valid & ATTR_SIZE) { 9275f3ef64fSTyler Hicks rc = truncate_upper(dentry, ia, &lower_ia); 928237fead6SMichael Halcrow if (rc < 0) 929237fead6SMichael Halcrow goto out; 930237fead6SMichael Halcrow } 9311ac564ecSJeff Layton 9321ac564ecSJeff Layton /* 9331ac564ecSJeff Layton * mode change is for clearing setuid/setgid bits. Allow lower fs 9341ac564ecSJeff Layton * to interpret this in its own way. 9351ac564ecSJeff Layton */ 9365f3ef64fSTyler Hicks if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 9375f3ef64fSTyler Hicks lower_ia.ia_valid &= ~ATTR_MODE; 9381ac564ecSJeff Layton 9395955102cSAl Viro inode_lock(d_inode(lower_dentry)); 94027ac0ffeSJ. Bruce Fields rc = notify_change(lower_dentry, &lower_ia, NULL); 9415955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 942237fead6SMichael Halcrow out: 9439afa2fb6SErez Zadok fsstack_copy_attr_all(inode, lower_inode); 944237fead6SMichael Halcrow return rc; 945237fead6SMichael Halcrow } 946237fead6SMichael Halcrow 947a528d35eSDavid Howells static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat, 948a528d35eSDavid Howells u32 request_mask, unsigned int flags) 9493a60a168STyler Hicks { 950a528d35eSDavid Howells struct dentry *dentry = path->dentry; 9513a60a168STyler Hicks struct ecryptfs_mount_crypt_stat *mount_crypt_stat; 9523a60a168STyler Hicks int rc = 0; 9533a60a168STyler Hicks 9543a60a168STyler Hicks mount_crypt_stat = &ecryptfs_superblock_to_private( 9553a60a168STyler Hicks dentry->d_sb)->mount_crypt_stat; 9562b0143b5SDavid Howells generic_fillattr(d_inode(dentry), stat); 9573a60a168STyler Hicks if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { 9583a60a168STyler Hicks char *target; 9593a60a168STyler Hicks size_t targetsiz; 9603a60a168STyler Hicks 961b22e8fedSAl Viro target = ecryptfs_readlink_lower(dentry, &targetsiz); 962b22e8fedSAl Viro if (!IS_ERR(target)) { 9633a60a168STyler Hicks kfree(target); 9643a60a168STyler Hicks stat->size = targetsiz; 965b22e8fedSAl Viro } else { 966b22e8fedSAl Viro rc = PTR_ERR(target); 9673a60a168STyler Hicks } 9683a60a168STyler Hicks } 9693a60a168STyler Hicks return rc; 9703a60a168STyler Hicks } 9713a60a168STyler Hicks 972a528d35eSDavid Howells static int ecryptfs_getattr(const struct path *path, struct kstat *stat, 973a528d35eSDavid Howells u32 request_mask, unsigned int flags) 974f8f484d1STyler Hicks { 975a528d35eSDavid Howells struct dentry *dentry = path->dentry; 976f8f484d1STyler Hicks struct kstat lower_stat; 977f8f484d1STyler Hicks int rc; 978f8f484d1STyler Hicks 979a528d35eSDavid Howells rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat, 980a528d35eSDavid Howells request_mask, flags); 981f8f484d1STyler Hicks if (!rc) { 9822b0143b5SDavid Howells fsstack_copy_attr_all(d_inode(dentry), 9832b0143b5SDavid Howells ecryptfs_inode_to_lower(d_inode(dentry))); 9842b0143b5SDavid Howells generic_fillattr(d_inode(dentry), stat); 985f8f484d1STyler Hicks stat->blocks = lower_stat.blocks; 986f8f484d1STyler Hicks } 987f8f484d1STyler Hicks return rc; 988f8f484d1STyler Hicks } 989f8f484d1STyler Hicks 990dd2a3b7aSMichael Halcrow int 9913767e255SAl Viro ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, 9923767e255SAl Viro const char *name, const void *value, 993237fead6SMichael Halcrow size_t size, int flags) 994237fead6SMichael Halcrow { 9955d6c3191SAndreas Gruenbacher int rc; 996237fead6SMichael Halcrow struct dentry *lower_dentry; 997237fead6SMichael Halcrow 998237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 9995d6c3191SAndreas Gruenbacher if (!(d_inode(lower_dentry)->i_opflags & IOP_XATTR)) { 1000cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1001237fead6SMichael Halcrow goto out; 1002237fead6SMichael Halcrow } 100348b512e6SRoberto Sassu rc = vfs_setxattr(lower_dentry, name, value, size, flags); 10043767e255SAl Viro if (!rc && inode) 10053767e255SAl Viro fsstack_copy_attr_all(inode, d_inode(lower_dentry)); 1006237fead6SMichael Halcrow out: 1007237fead6SMichael Halcrow return rc; 1008237fead6SMichael Halcrow } 1009237fead6SMichael Halcrow 1010dd2a3b7aSMichael Halcrow ssize_t 1011ce23e640SAl Viro ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, 1012ce23e640SAl Viro const char *name, void *value, size_t size) 1013d7cdc5feSMichael Halcrow { 10145d6c3191SAndreas Gruenbacher int rc; 1015d7cdc5feSMichael Halcrow 10165d6c3191SAndreas Gruenbacher if (!(lower_inode->i_opflags & IOP_XATTR)) { 1017cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1018d7cdc5feSMichael Halcrow goto out; 1019d7cdc5feSMichael Halcrow } 1020ce23e640SAl Viro inode_lock(lower_inode); 10215d6c3191SAndreas Gruenbacher rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size); 1022ce23e640SAl Viro inode_unlock(lower_inode); 1023d7cdc5feSMichael Halcrow out: 1024d7cdc5feSMichael Halcrow return rc; 1025d7cdc5feSMichael Halcrow } 1026d7cdc5feSMichael Halcrow 10277896b631SAdrian Bunk static ssize_t 1028ce23e640SAl Viro ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, 1029ce23e640SAl Viro const char *name, void *value, size_t size) 1030237fead6SMichael Halcrow { 1031ce23e640SAl Viro return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), 1032ce23e640SAl Viro ecryptfs_inode_to_lower(inode), 1033ce23e640SAl Viro name, value, size); 1034237fead6SMichael Halcrow } 1035237fead6SMichael Halcrow 1036237fead6SMichael Halcrow static ssize_t 1037237fead6SMichael Halcrow ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) 1038237fead6SMichael Halcrow { 1039237fead6SMichael Halcrow int rc = 0; 1040237fead6SMichael Halcrow struct dentry *lower_dentry; 1041237fead6SMichael Halcrow 1042237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10432b0143b5SDavid Howells if (!d_inode(lower_dentry)->i_op->listxattr) { 1044cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1045237fead6SMichael Halcrow goto out; 1046237fead6SMichael Halcrow } 10475955102cSAl Viro inode_lock(d_inode(lower_dentry)); 10482b0143b5SDavid Howells rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); 10495955102cSAl Viro inode_unlock(d_inode(lower_dentry)); 1050237fead6SMichael Halcrow out: 1051237fead6SMichael Halcrow return rc; 1052237fead6SMichael Halcrow } 1053237fead6SMichael Halcrow 10544b899da5SAndreas Gruenbacher static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, 10554b899da5SAndreas Gruenbacher const char *name) 1056237fead6SMichael Halcrow { 10575d6c3191SAndreas Gruenbacher int rc; 1058237fead6SMichael Halcrow struct dentry *lower_dentry; 10594b899da5SAndreas Gruenbacher struct inode *lower_inode; 1060237fead6SMichael Halcrow 1061237fead6SMichael Halcrow lower_dentry = ecryptfs_dentry_to_lower(dentry); 10624b899da5SAndreas Gruenbacher lower_inode = ecryptfs_inode_to_lower(inode); 10635d6c3191SAndreas Gruenbacher if (!(lower_inode->i_opflags & IOP_XATTR)) { 1064cfce08c6SChristian Pulvermacher rc = -EOPNOTSUPP; 1065237fead6SMichael Halcrow goto out; 1066237fead6SMichael Halcrow } 10674b899da5SAndreas Gruenbacher inode_lock(lower_inode); 10685d6c3191SAndreas Gruenbacher rc = __vfs_removexattr(lower_dentry, name); 10694b899da5SAndreas Gruenbacher inode_unlock(lower_inode); 1070237fead6SMichael Halcrow out: 1071237fead6SMichael Halcrow return rc; 1072237fead6SMichael Halcrow } 1073237fead6SMichael Halcrow 1074754661f1SArjan van de Ven const struct inode_operations ecryptfs_symlink_iops = { 10756b255391SAl Viro .get_link = ecryptfs_get_link, 1076237fead6SMichael Halcrow .permission = ecryptfs_permission, 1077237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 10783a60a168STyler Hicks .getattr = ecryptfs_getattr_link, 1079237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1080237fead6SMichael Halcrow }; 1081237fead6SMichael Halcrow 1082754661f1SArjan van de Ven const struct inode_operations ecryptfs_dir_iops = { 1083237fead6SMichael Halcrow .create = ecryptfs_create, 1084237fead6SMichael Halcrow .lookup = ecryptfs_lookup, 1085237fead6SMichael Halcrow .link = ecryptfs_link, 1086237fead6SMichael Halcrow .unlink = ecryptfs_unlink, 1087237fead6SMichael Halcrow .symlink = ecryptfs_symlink, 1088237fead6SMichael Halcrow .mkdir = ecryptfs_mkdir, 1089237fead6SMichael Halcrow .rmdir = ecryptfs_rmdir, 1090237fead6SMichael Halcrow .mknod = ecryptfs_mknod, 1091237fead6SMichael Halcrow .rename = ecryptfs_rename, 1092237fead6SMichael Halcrow .permission = ecryptfs_permission, 1093237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1094237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 1095237fead6SMichael Halcrow }; 1096237fead6SMichael Halcrow 1097754661f1SArjan van de Ven const struct inode_operations ecryptfs_main_iops = { 1098237fead6SMichael Halcrow .permission = ecryptfs_permission, 1099237fead6SMichael Halcrow .setattr = ecryptfs_setattr, 1100f8f484d1STyler Hicks .getattr = ecryptfs_getattr, 1101237fead6SMichael Halcrow .listxattr = ecryptfs_listxattr, 11024b899da5SAndreas Gruenbacher }; 11034b899da5SAndreas Gruenbacher 11044b899da5SAndreas Gruenbacher static int ecryptfs_xattr_get(const struct xattr_handler *handler, 11054b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11064b899da5SAndreas Gruenbacher const char *name, void *buffer, size_t size) 11074b899da5SAndreas Gruenbacher { 11084b899da5SAndreas Gruenbacher return ecryptfs_getxattr(dentry, inode, name, buffer, size); 11094b899da5SAndreas Gruenbacher } 11104b899da5SAndreas Gruenbacher 11114b899da5SAndreas Gruenbacher static int ecryptfs_xattr_set(const struct xattr_handler *handler, 11124b899da5SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 11134b899da5SAndreas Gruenbacher const char *name, const void *value, size_t size, 11144b899da5SAndreas Gruenbacher int flags) 11154b899da5SAndreas Gruenbacher { 11164b899da5SAndreas Gruenbacher if (value) 11174b899da5SAndreas Gruenbacher return ecryptfs_setxattr(dentry, inode, name, value, size, flags); 11184b899da5SAndreas Gruenbacher else { 11194b899da5SAndreas Gruenbacher BUG_ON(flags != XATTR_REPLACE); 11204b899da5SAndreas Gruenbacher return ecryptfs_removexattr(dentry, inode, name); 11214b899da5SAndreas Gruenbacher } 11224b899da5SAndreas Gruenbacher } 11234b899da5SAndreas Gruenbacher 11244b899da5SAndreas Gruenbacher const struct xattr_handler ecryptfs_xattr_handler = { 11254b899da5SAndreas Gruenbacher .prefix = "", /* match anything */ 11264b899da5SAndreas Gruenbacher .get = ecryptfs_xattr_get, 11274b899da5SAndreas Gruenbacher .set = ecryptfs_xattr_set, 11284b899da5SAndreas Gruenbacher }; 11294b899da5SAndreas Gruenbacher 11304b899da5SAndreas Gruenbacher const struct xattr_handler *ecryptfs_xattr_handlers[] = { 11314b899da5SAndreas Gruenbacher &ecryptfs_xattr_handler, 11324b899da5SAndreas Gruenbacher NULL 1133237fead6SMichael Halcrow }; 1134