Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1 | /** |
| 2 | * eCryptfs: Linux filesystem encryption layer |
| 3 | * |
| 4 | * Copyright (C) 1997-2004 Erez Zadok |
| 5 | * Copyright (C) 2001-2004 Stony Brook University |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 6 | * Copyright (C) 2004-2007 International Business Machines Corp. |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 7 | * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> |
| 8 | * Michael C. Thompsion <mcthomps@us.ibm.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License as |
| 12 | * published by the Free Software Foundation; either version 2 of the |
| 13 | * License, or (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, but |
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| 23 | * 02111-1307, USA. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/file.h> |
| 27 | #include <linux/vmalloc.h> |
| 28 | #include <linux/pagemap.h> |
| 29 | #include <linux/dcache.h> |
| 30 | #include <linux/namei.h> |
| 31 | #include <linux/mount.h> |
| 32 | #include <linux/crypto.h> |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 33 | #include <linux/fs_stack.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 34 | #include <linux/slab.h> |
Roberto Sassu | 48b512e | 2010-10-05 18:53:45 +0200 | [diff] [blame] | 35 | #include <linux/xattr.h> |
Harvey Harrison | 0a688ad | 2008-07-23 21:30:07 -0700 | [diff] [blame] | 36 | #include <asm/unaligned.h> |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 37 | #include "ecryptfs_kernel.h" |
| 38 | |
| 39 | static struct dentry *lock_parent(struct dentry *dentry) |
| 40 | { |
| 41 | struct dentry *dir; |
| 42 | |
Miklos Szeredi | 8dc4e37 | 2008-05-12 14:02:04 -0700 | [diff] [blame] | 43 | dir = dget_parent(dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 44 | mutex_lock_nested(&(d_inode(dir)->i_mutex), I_MUTEX_PARENT); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 45 | return dir; |
| 46 | } |
| 47 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 48 | static void unlock_dir(struct dentry *dir) |
| 49 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 50 | mutex_unlock(&d_inode(dir)->i_mutex); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 51 | dput(dir); |
| 52 | } |
| 53 | |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 54 | static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) |
| 55 | { |
Himangi Saraogi | c4cf3ba | 2014-06-27 01:11:59 +0530 | [diff] [blame] | 56 | return ecryptfs_inode_to_lower(inode) == lower_inode; |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 57 | } |
| 58 | |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 59 | static int ecryptfs_inode_set(struct inode *inode, void *opaque) |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 60 | { |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 61 | struct inode *lower_inode = opaque; |
| 62 | |
| 63 | ecryptfs_set_inode_lower(inode, lower_inode); |
| 64 | fsstack_copy_attr_all(inode, lower_inode); |
| 65 | /* i_size will be overwritten for encrypted regular files */ |
| 66 | fsstack_copy_inode_size(inode, lower_inode); |
| 67 | inode->i_ino = lower_inode->i_ino; |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 68 | inode->i_version++; |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 69 | inode->i_mapping->a_ops = &ecryptfs_aops; |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 70 | |
| 71 | if (S_ISLNK(inode->i_mode)) |
| 72 | inode->i_op = &ecryptfs_symlink_iops; |
| 73 | else if (S_ISDIR(inode->i_mode)) |
| 74 | inode->i_op = &ecryptfs_dir_iops; |
| 75 | else |
| 76 | inode->i_op = &ecryptfs_main_iops; |
| 77 | |
| 78 | if (S_ISDIR(inode->i_mode)) |
| 79 | inode->i_fop = &ecryptfs_dir_fops; |
| 80 | else if (special_file(inode->i_mode)) |
| 81 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
| 82 | else |
| 83 | inode->i_fop = &ecryptfs_main_fops; |
| 84 | |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 85 | return 0; |
| 86 | } |
| 87 | |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 88 | static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, |
| 89 | struct super_block *sb) |
| 90 | { |
| 91 | struct inode *inode; |
| 92 | |
| 93 | if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) |
| 94 | return ERR_PTR(-EXDEV); |
| 95 | if (!igrab(lower_inode)) |
| 96 | return ERR_PTR(-ESTALE); |
| 97 | inode = iget5_locked(sb, (unsigned long)lower_inode, |
| 98 | ecryptfs_inode_test, ecryptfs_inode_set, |
| 99 | lower_inode); |
| 100 | if (!inode) { |
| 101 | iput(lower_inode); |
| 102 | return ERR_PTR(-EACCES); |
| 103 | } |
| 104 | if (!(inode->i_state & I_NEW)) |
| 105 | iput(lower_inode); |
| 106 | |
| 107 | return inode; |
| 108 | } |
| 109 | |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 110 | struct inode *ecryptfs_get_inode(struct inode *lower_inode, |
| 111 | struct super_block *sb) |
| 112 | { |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 113 | struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 114 | |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 115 | if (!IS_ERR(inode) && (inode->i_state & I_NEW)) |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 116 | unlock_new_inode(inode); |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 117 | |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 118 | return inode; |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 119 | } |
| 120 | |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 121 | /** |
| 122 | * ecryptfs_interpose |
| 123 | * @lower_dentry: Existing dentry in the lower filesystem |
| 124 | * @dentry: ecryptfs' dentry |
| 125 | * @sb: ecryptfs's super_block |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 126 | * |
| 127 | * Interposes upper and lower dentries. |
| 128 | * |
| 129 | * Returns zero on success; non-zero otherwise |
| 130 | */ |
| 131 | static int ecryptfs_interpose(struct dentry *lower_dentry, |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 132 | struct dentry *dentry, struct super_block *sb) |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 133 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 134 | struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 135 | |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 136 | if (IS_ERR(inode)) |
| 137 | return PTR_ERR(inode); |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 138 | d_instantiate(dentry, inode); |
| 139 | |
Tyler Hicks | c4f7907 | 2011-05-23 21:18:20 -0500 | [diff] [blame] | 140 | return 0; |
| 141 | } |
| 142 | |
Tyler Hicks | 8bc2d3c | 2012-05-22 15:09:50 -0500 | [diff] [blame] | 143 | static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, |
| 144 | struct inode *inode) |
| 145 | { |
| 146 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 147 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); |
| 148 | struct dentry *lower_dir_dentry; |
| 149 | int rc; |
| 150 | |
| 151 | dget(lower_dentry); |
| 152 | lower_dir_dentry = lock_parent(lower_dentry); |
J. Bruce Fields | b21996e | 2011-09-20 09:14:34 -0400 | [diff] [blame] | 153 | rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); |
Tyler Hicks | 8bc2d3c | 2012-05-22 15:09:50 -0500 | [diff] [blame] | 154 | if (rc) { |
| 155 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
| 156 | goto out_unlock; |
| 157 | } |
| 158 | fsstack_copy_attr_times(dir, lower_dir_inode); |
| 159 | set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); |
| 160 | inode->i_ctime = dir->i_ctime; |
| 161 | d_drop(dentry); |
| 162 | out_unlock: |
| 163 | unlock_dir(lower_dir_dentry); |
| 164 | dput(lower_dentry); |
| 165 | return rc; |
| 166 | } |
| 167 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 168 | /** |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 169 | * ecryptfs_do_create |
| 170 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs |
| 171 | * @ecryptfs_dentry: New file's dentry in ecryptfs |
| 172 | * @mode: The mode of the new file |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 173 | * |
| 174 | * Creates the underlying file and the eCryptfs inode which will link to |
| 175 | * it. It will also update the eCryptfs directory inode to mimic the |
| 176 | * stat of the lower directory inode. |
| 177 | * |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 178 | * Returns the new eCryptfs inode on success; an ERR_PTR on error condition |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 179 | */ |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 180 | static struct inode * |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 181 | ecryptfs_do_create(struct inode *directory_inode, |
Al Viro | 175a4eb | 2011-07-26 03:30:54 -0400 | [diff] [blame] | 182 | struct dentry *ecryptfs_dentry, umode_t mode) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 183 | { |
| 184 | int rc; |
| 185 | struct dentry *lower_dentry; |
| 186 | struct dentry *lower_dir_dentry; |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 187 | struct inode *inode; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 188 | |
| 189 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); |
| 190 | lower_dir_dentry = lock_parent(lower_dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 191 | rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true); |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 192 | if (rc) { |
Michael Halcrow | caeeeec | 2008-01-08 15:33:02 -0800 | [diff] [blame] | 193 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
Harvey Harrison | 18d1dbf | 2008-04-29 00:59:48 -0700 | [diff] [blame] | 194 | "rc = [%d]\n", __func__, rc); |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 195 | inode = ERR_PTR(rc); |
Michael Halcrow | caeeeec | 2008-01-08 15:33:02 -0800 | [diff] [blame] | 196 | goto out_lock; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 197 | } |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 198 | inode = __ecryptfs_get_inode(d_inode(lower_dentry), |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 199 | directory_inode->i_sb); |
Tyler Hicks | 8bc2d3c | 2012-05-22 15:09:50 -0500 | [diff] [blame] | 200 | if (IS_ERR(inode)) { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 201 | vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 202 | goto out_lock; |
Tyler Hicks | 8bc2d3c | 2012-05-22 15:09:50 -0500 | [diff] [blame] | 203 | } |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 204 | fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); |
| 205 | fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 206 | out_lock: |
| 207 | unlock_dir(lower_dir_dentry); |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 208 | return inode; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 209 | } |
| 210 | |
| 211 | /** |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 212 | * ecryptfs_initialize_file |
| 213 | * |
| 214 | * Cause the file to be changed from a basic empty file to an ecryptfs |
| 215 | * file with a header and first data page. |
| 216 | * |
| 217 | * Returns zero on success |
| 218 | */ |
Tyler Hicks | e3ccaa9 | 2012-06-20 23:50:59 -0700 | [diff] [blame] | 219 | int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, |
| 220 | struct inode *ecryptfs_inode) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 221 | { |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 222 | struct ecryptfs_crypt_stat *crypt_stat = |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 223 | &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 224 | int rc = 0; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 225 | |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 226 | if (S_ISDIR(ecryptfs_inode->i_mode)) { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 227 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); |
Michael Halcrow | e2bd99e | 2007-02-12 00:53:49 -0800 | [diff] [blame] | 228 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 229 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 230 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 231 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 232 | rc = ecryptfs_new_file_context(ecryptfs_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 233 | if (rc) { |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 234 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
| 235 | "context; rc = [%d]\n", rc); |
| 236 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 237 | } |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 238 | rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); |
Roberto Sassu | 2799289 | 2010-11-03 11:11:28 +0100 | [diff] [blame] | 239 | if (rc) { |
| 240 | printk(KERN_ERR "%s: Error attempting to initialize " |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 241 | "the lower file for the dentry with name " |
David Howells | 9e78d14 | 2013-12-10 15:26:48 +0000 | [diff] [blame] | 242 | "[%pd]; rc = [%d]\n", __func__, |
| 243 | ecryptfs_dentry, rc); |
Roberto Sassu | 2799289 | 2010-11-03 11:11:28 +0100 | [diff] [blame] | 244 | goto out; |
Michael Halcrow | 391b52f | 2008-07-23 21:30:08 -0700 | [diff] [blame] | 245 | } |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 246 | rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 247 | if (rc) |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 248 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 249 | ecryptfs_put_lower_file(ecryptfs_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 250 | out: |
| 251 | return rc; |
| 252 | } |
| 253 | |
| 254 | /** |
| 255 | * ecryptfs_create |
| 256 | * @dir: The inode of the directory in which to create the file. |
| 257 | * @dentry: The eCryptfs dentry |
| 258 | * @mode: The mode of the new file. |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 259 | * |
| 260 | * Creates a new file. |
| 261 | * |
| 262 | * Returns zero on success; non-zero on error condition |
| 263 | */ |
| 264 | static int |
| 265 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 266 | umode_t mode, bool excl) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 267 | { |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 268 | struct inode *ecryptfs_inode; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 269 | int rc; |
| 270 | |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 271 | ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, |
| 272 | mode); |
Viresh Kumar | a1c8368 | 2015-08-12 15:59:44 +0530 | [diff] [blame] | 273 | if (IS_ERR(ecryptfs_inode)) { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 274 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
| 275 | "lower filesystem\n"); |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 276 | rc = PTR_ERR(ecryptfs_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 277 | goto out; |
| 278 | } |
| 279 | /* At this point, a file exists on "disk"; we need to make sure |
| 280 | * that this on disk file is prepared to be an ecryptfs file */ |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 281 | rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); |
| 282 | if (rc) { |
Tyler Hicks | 8bc2d3c | 2012-05-22 15:09:50 -0500 | [diff] [blame] | 283 | ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, |
| 284 | ecryptfs_inode); |
| 285 | make_bad_inode(ecryptfs_inode); |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 286 | unlock_new_inode(ecryptfs_inode); |
| 287 | iput(ecryptfs_inode); |
| 288 | goto out; |
| 289 | } |
Tyler Hicks | b59db43 | 2011-11-21 17:31:02 -0600 | [diff] [blame] | 290 | unlock_new_inode(ecryptfs_inode); |
Al Viro | 8fc37ec | 2012-07-19 09:18:15 +0400 | [diff] [blame] | 291 | d_instantiate(ecryptfs_dentry, ecryptfs_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 292 | out: |
| 293 | return rc; |
| 294 | } |
| 295 | |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 296 | static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 297 | { |
Tyler Hicks | 2aac0cf | 2009-03-20 02:23:57 -0500 | [diff] [blame] | 298 | struct ecryptfs_crypt_stat *crypt_stat; |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 299 | int rc; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 300 | |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 301 | rc = ecryptfs_get_lower_file(dentry, inode); |
Roberto Sassu | 2799289 | 2010-11-03 11:11:28 +0100 | [diff] [blame] | 302 | if (rc) { |
| 303 | printk(KERN_ERR "%s: Error attempting to initialize " |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 304 | "the lower file for the dentry with name " |
David Howells | 9e78d14 | 2013-12-10 15:26:48 +0000 | [diff] [blame] | 305 | "[%pd]; rc = [%d]\n", __func__, |
| 306 | dentry, rc); |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 307 | return rc; |
Michael Halcrow | 391b52f | 2008-07-23 21:30:08 -0700 | [diff] [blame] | 308 | } |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 309 | |
Tyler Hicks | 3b06b3e | 2011-05-24 03:49:02 -0500 | [diff] [blame] | 310 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; |
Tyler Hicks | 2aac0cf | 2009-03-20 02:23:57 -0500 | [diff] [blame] | 311 | /* TODO: lock for crypt_stat comparison */ |
| 312 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 313 | ecryptfs_set_default_sizes(crypt_stat); |
| 314 | |
| 315 | rc = ecryptfs_read_and_validate_header_region(inode); |
| 316 | ecryptfs_put_lower_file(inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 317 | if (rc) { |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 318 | rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); |
| 319 | if (!rc) |
| 320 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 321 | } |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 322 | |
| 323 | /* Must return 0 to allow non-eCryptfs files to be looked up, too */ |
| 324 | return 0; |
| 325 | } |
| 326 | |
| 327 | /** |
| 328 | * ecryptfs_lookup_interpose - Dentry interposition for a lookup |
| 329 | */ |
| 330 | static int ecryptfs_lookup_interpose(struct dentry *dentry, |
| 331 | struct dentry *lower_dentry, |
| 332 | struct inode *dir_inode) |
| 333 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 334 | struct inode *inode, *lower_inode = d_inode(lower_dentry); |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 335 | struct ecryptfs_dentry_info *dentry_info; |
| 336 | struct vfsmount *lower_mnt; |
| 337 | int rc = 0; |
| 338 | |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 339 | dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 340 | if (!dentry_info) { |
| 341 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
| 342 | "to allocate ecryptfs_dentry_info struct\n", |
| 343 | __func__); |
| 344 | dput(lower_dentry); |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 345 | return -ENOMEM; |
| 346 | } |
Al Viro | 0b1d901 | 2012-07-20 12:09:19 +0400 | [diff] [blame] | 347 | |
| 348 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 349 | fsstack_copy_attr_atime(dir_inode, d_inode(lower_dentry->d_parent)); |
Al Viro | 84d08fa | 2013-07-05 18:59:33 +0400 | [diff] [blame] | 350 | BUG_ON(!d_count(lower_dentry)); |
Al Viro | 0b1d901 | 2012-07-20 12:09:19 +0400 | [diff] [blame] | 351 | |
| 352 | ecryptfs_set_dentry_private(dentry, dentry_info); |
Al Viro | 92dd123 | 2013-09-15 20:50:13 -0400 | [diff] [blame] | 353 | dentry_info->lower_path.mnt = lower_mnt; |
| 354 | dentry_info->lower_path.dentry = lower_dentry; |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 355 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 356 | if (d_really_is_negative(lower_dentry)) { |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 357 | /* We want to add because we couldn't find in lower */ |
| 358 | d_add(dentry, NULL); |
| 359 | return 0; |
| 360 | } |
| 361 | inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb); |
| 362 | if (IS_ERR(inode)) { |
| 363 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", |
| 364 | __func__, PTR_ERR(inode)); |
| 365 | return PTR_ERR(inode); |
| 366 | } |
| 367 | if (S_ISREG(inode->i_mode)) { |
| 368 | rc = ecryptfs_i_size_read(dentry, inode); |
| 369 | if (rc) { |
| 370 | make_bad_inode(inode); |
| 371 | return rc; |
| 372 | } |
| 373 | } |
| 374 | |
Tyler Hicks | 3b06b3e | 2011-05-24 03:49:02 -0500 | [diff] [blame] | 375 | if (inode->i_state & I_NEW) |
| 376 | unlock_new_inode(inode); |
Tyler Hicks | 778aeb4 | 2011-05-24 04:56:23 -0500 | [diff] [blame] | 377 | d_add(dentry, inode); |
| 378 | |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 379 | return rc; |
| 380 | } |
| 381 | |
| 382 | /** |
| 383 | * ecryptfs_lookup |
| 384 | * @ecryptfs_dir_inode: The eCryptfs directory inode |
| 385 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up |
Al Viro | 89076bc | 2015-05-12 08:29:38 -0400 | [diff] [blame] | 386 | * @flags: lookup flags |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 387 | * |
| 388 | * Find a file on disk. If the file does not exist, then we'll add it to the |
| 389 | * dentry cache and continue on to read it from the disk. |
| 390 | */ |
| 391 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, |
| 392 | struct dentry *ecryptfs_dentry, |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 393 | unsigned int flags) |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 394 | { |
| 395 | char *encrypted_and_encoded_name = NULL; |
Michael Halcrow | a8f1286 | 2009-01-06 14:42:03 -0800 | [diff] [blame] | 396 | size_t encrypted_and_encoded_name_size; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 397 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 398 | struct dentry *lower_dir_dentry, *lower_dentry; |
| 399 | int rc = 0; |
| 400 | |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 401 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 402 | mutex_lock(&d_inode(lower_dir_dentry)->i_mutex); |
Tyler Hicks | 8787c7a | 2011-02-17 18:51:24 -0600 | [diff] [blame] | 403 | lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, |
| 404 | lower_dir_dentry, |
| 405 | ecryptfs_dentry->d_name.len); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 406 | mutex_unlock(&d_inode(lower_dir_dentry)->i_mutex); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 407 | if (IS_ERR(lower_dentry)) { |
| 408 | rc = PTR_ERR(lower_dentry); |
Tyler Hicks | 8787c7a | 2011-02-17 18:51:24 -0600 | [diff] [blame] | 409 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
David Howells | 9e78d14 | 2013-12-10 15:26:48 +0000 | [diff] [blame] | 410 | "[%d] on lower_dentry = [%pd]\n", __func__, rc, |
| 411 | ecryptfs_dentry); |
Al Viro | bc65a12 | 2012-07-20 12:03:41 +0400 | [diff] [blame] | 412 | goto out; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 413 | } |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 414 | if (d_really_is_positive(lower_dentry)) |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 415 | goto interpose; |
Tyler Hicks | 2aac0cf | 2009-03-20 02:23:57 -0500 | [diff] [blame] | 416 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
| 417 | ecryptfs_dentry->d_sb)->mount_crypt_stat; |
| 418 | if (!(mount_crypt_stat |
| 419 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 420 | goto interpose; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 421 | dput(lower_dentry); |
| 422 | rc = ecryptfs_encrypt_and_encode_filename( |
| 423 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, |
Tyler Hicks | 2aac0cf | 2009-03-20 02:23:57 -0500 | [diff] [blame] | 424 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 425 | ecryptfs_dentry->d_name.len); |
| 426 | if (rc) { |
| 427 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " |
| 428 | "filename; rc = [%d]\n", __func__, rc); |
Al Viro | bc65a12 | 2012-07-20 12:03:41 +0400 | [diff] [blame] | 429 | goto out; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 430 | } |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 431 | mutex_lock(&d_inode(lower_dir_dentry)->i_mutex); |
Tyler Hicks | 8787c7a | 2011-02-17 18:51:24 -0600 | [diff] [blame] | 432 | lower_dentry = lookup_one_len(encrypted_and_encoded_name, |
| 433 | lower_dir_dentry, |
| 434 | encrypted_and_encoded_name_size); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 435 | mutex_unlock(&d_inode(lower_dir_dentry)->i_mutex); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 436 | if (IS_ERR(lower_dentry)) { |
| 437 | rc = PTR_ERR(lower_dentry); |
Tyler Hicks | 8787c7a | 2011-02-17 18:51:24 -0600 | [diff] [blame] | 438 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
Tyler Hicks | 9f37622 | 2010-03-25 11:16:56 -0500 | [diff] [blame] | 439 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
| 440 | encrypted_and_encoded_name); |
Al Viro | bc65a12 | 2012-07-20 12:03:41 +0400 | [diff] [blame] | 441 | goto out; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 442 | } |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 443 | interpose: |
| 444 | rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry, |
| 445 | ecryptfs_dir_inode); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 446 | out: |
| 447 | kfree(encrypted_and_encoded_name); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 448 | return ERR_PTR(rc); |
| 449 | } |
| 450 | |
| 451 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, |
| 452 | struct dentry *new_dentry) |
| 453 | { |
| 454 | struct dentry *lower_old_dentry; |
| 455 | struct dentry *lower_new_dentry; |
| 456 | struct dentry *lower_dir_dentry; |
| 457 | u64 file_size_save; |
| 458 | int rc; |
| 459 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 460 | file_size_save = i_size_read(d_inode(old_dentry)); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 461 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
| 462 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); |
| 463 | dget(lower_old_dentry); |
| 464 | dget(lower_new_dentry); |
| 465 | lower_dir_dentry = lock_parent(lower_new_dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 466 | rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), |
J. Bruce Fields | 146a859 | 2011-09-20 17:14:31 -0400 | [diff] [blame] | 467 | lower_new_dentry, NULL); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 468 | if (rc || d_really_is_negative(lower_new_dentry)) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 469 | goto out_lock; |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 470 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 471 | if (rc) |
| 472 | goto out_lock; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 473 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
| 474 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); |
| 475 | set_nlink(d_inode(old_dentry), |
| 476 | ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); |
| 477 | i_size_write(d_inode(new_dentry), file_size_save); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 478 | out_lock: |
| 479 | unlock_dir(lower_dir_dentry); |
| 480 | dput(lower_new_dentry); |
| 481 | dput(lower_old_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 482 | return rc; |
| 483 | } |
| 484 | |
| 485 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) |
| 486 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 487 | return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, |
| 491 | const char *symname) |
| 492 | { |
| 493 | int rc; |
| 494 | struct dentry *lower_dentry; |
| 495 | struct dentry *lower_dir_dentry; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 496 | char *encoded_symname; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 497 | size_t encoded_symlen; |
| 498 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 499 | |
| 500 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 501 | dget(lower_dentry); |
| 502 | lower_dir_dentry = lock_parent(lower_dentry); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 503 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
| 504 | dir->i_sb)->mount_crypt_stat; |
| 505 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, |
| 506 | &encoded_symlen, |
| 507 | NULL, |
| 508 | mount_crypt_stat, symname, |
| 509 | strlen(symname)); |
| 510 | if (rc) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 511 | goto out_lock; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 512 | rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry, |
Miklos Szeredi | db2e747 | 2008-06-24 16:50:16 +0200 | [diff] [blame] | 513 | encoded_symname); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 514 | kfree(encoded_symname); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 515 | if (rc || d_really_is_negative(lower_dentry)) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 516 | goto out_lock; |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 517 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 518 | if (rc) |
| 519 | goto out_lock; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 520 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
| 521 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 522 | out_lock: |
| 523 | unlock_dir(lower_dir_dentry); |
| 524 | dput(lower_dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 525 | if (d_really_is_negative(dentry)) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 526 | d_drop(dentry); |
| 527 | return rc; |
| 528 | } |
| 529 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 530 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 531 | { |
| 532 | int rc; |
| 533 | struct dentry *lower_dentry; |
| 534 | struct dentry *lower_dir_dentry; |
| 535 | |
| 536 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 537 | lower_dir_dentry = lock_parent(lower_dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 538 | rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode); |
| 539 | if (rc || d_really_is_negative(lower_dentry)) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 540 | goto out; |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 541 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 542 | if (rc) |
| 543 | goto out; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 544 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
| 545 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); |
| 546 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 547 | out: |
| 548 | unlock_dir(lower_dir_dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 549 | if (d_really_is_negative(dentry)) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 550 | d_drop(dentry); |
| 551 | return rc; |
| 552 | } |
| 553 | |
| 554 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 555 | { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 556 | struct dentry *lower_dentry; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 557 | struct dentry *lower_dir_dentry; |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 558 | int rc; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 559 | |
| 560 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 561 | dget(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 562 | lower_dir_dentry = lock_parent(lower_dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 563 | dget(lower_dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 564 | rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 565 | dput(lower_dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 566 | if (!rc && d_really_is_positive(dentry)) |
| 567 | clear_nlink(d_inode(dentry)); |
| 568 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
| 569 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 570 | unlock_dir(lower_dir_dentry); |
| 571 | if (!rc) |
| 572 | d_drop(dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 573 | dput(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 574 | return rc; |
| 575 | } |
| 576 | |
| 577 | static int |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 578 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 579 | { |
| 580 | int rc; |
| 581 | struct dentry *lower_dentry; |
| 582 | struct dentry *lower_dir_dentry; |
| 583 | |
| 584 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 585 | lower_dir_dentry = lock_parent(lower_dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 586 | rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev); |
| 587 | if (rc || d_really_is_negative(lower_dentry)) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 588 | goto out; |
Tyler Hicks | 5ccf920 | 2011-05-24 02:16:51 -0500 | [diff] [blame] | 589 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 590 | if (rc) |
| 591 | goto out; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 592 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
| 593 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 594 | out: |
| 595 | unlock_dir(lower_dir_dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 596 | if (d_really_is_negative(dentry)) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 597 | d_drop(dentry); |
| 598 | return rc; |
| 599 | } |
| 600 | |
| 601 | static int |
| 602 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 603 | struct inode *new_dir, struct dentry *new_dentry) |
| 604 | { |
| 605 | int rc; |
| 606 | struct dentry *lower_old_dentry; |
| 607 | struct dentry *lower_new_dentry; |
| 608 | struct dentry *lower_old_dir_dentry; |
| 609 | struct dentry *lower_new_dir_dentry; |
Erez Zadok | 0d132f7 | 2009-12-05 21:17:09 -0500 | [diff] [blame] | 610 | struct dentry *trap = NULL; |
Tyler Hicks | 8335eaf | 2012-09-13 12:00:56 -0700 | [diff] [blame] | 611 | struct inode *target_inode; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 612 | |
| 613 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
| 614 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); |
| 615 | dget(lower_old_dentry); |
| 616 | dget(lower_new_dentry); |
| 617 | lower_old_dir_dentry = dget_parent(lower_old_dentry); |
| 618 | lower_new_dir_dentry = dget_parent(lower_new_dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 619 | target_inode = d_inode(new_dentry); |
Erez Zadok | 0d132f7 | 2009-12-05 21:17:09 -0500 | [diff] [blame] | 620 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
| 621 | /* source should not be ancestor of target */ |
| 622 | if (trap == lower_old_dentry) { |
| 623 | rc = -EINVAL; |
| 624 | goto out_lock; |
| 625 | } |
| 626 | /* target should not be ancestor of source */ |
| 627 | if (trap == lower_new_dentry) { |
| 628 | rc = -ENOTEMPTY; |
| 629 | goto out_lock; |
| 630 | } |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 631 | rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, |
| 632 | d_inode(lower_new_dir_dentry), lower_new_dentry, |
Miklos Szeredi | 520c8b1 | 2014-04-01 17:08:42 +0200 | [diff] [blame] | 633 | NULL, 0); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 634 | if (rc) |
| 635 | goto out_lock; |
Tyler Hicks | 8335eaf | 2012-09-13 12:00:56 -0700 | [diff] [blame] | 636 | if (target_inode) |
| 637 | fsstack_copy_attr_all(target_inode, |
| 638 | ecryptfs_inode_to_lower(target_inode)); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 639 | fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 640 | if (new_dir != old_dir) |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 641 | fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 642 | out_lock: |
| 643 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
Tyler Hicks | dd55c898 | 2011-04-12 11:23:09 -0500 | [diff] [blame] | 644 | dput(lower_new_dir_dentry); |
| 645 | dput(lower_old_dir_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 646 | dput(lower_new_dentry); |
| 647 | dput(lower_old_dentry); |
| 648 | return rc; |
| 649 | } |
| 650 | |
Al Viro | b22e8fe | 2013-11-29 22:51:47 -0500 | [diff] [blame] | 651 | static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 652 | { |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 653 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 654 | char *lower_buf; |
Al Viro | b22e8fe | 2013-11-29 22:51:47 -0500 | [diff] [blame] | 655 | char *buf; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 656 | mm_segment_t old_fs; |
| 657 | int rc; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 658 | |
Al Viro | 408bd62 | 2012-05-03 09:34:20 -0400 | [diff] [blame] | 659 | lower_buf = kmalloc(PATH_MAX, GFP_KERNEL); |
Al Viro | b22e8fe | 2013-11-29 22:51:47 -0500 | [diff] [blame] | 660 | if (!lower_buf) |
| 661 | return ERR_PTR(-ENOMEM); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 662 | old_fs = get_fs(); |
| 663 | set_fs(get_ds()); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 664 | rc = d_inode(lower_dentry)->i_op->readlink(lower_dentry, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 665 | (char __user *)lower_buf, |
Al Viro | 408bd62 | 2012-05-03 09:34:20 -0400 | [diff] [blame] | 666 | PATH_MAX); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 667 | set_fs(old_fs); |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 668 | if (rc < 0) |
| 669 | goto out; |
Al Viro | b22e8fe | 2013-11-29 22:51:47 -0500 | [diff] [blame] | 670 | rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, |
Al Viro | 408bd62 | 2012-05-03 09:34:20 -0400 | [diff] [blame] | 671 | lower_buf, rc); |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 672 | out: |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 673 | kfree(lower_buf); |
Al Viro | b22e8fe | 2013-11-29 22:51:47 -0500 | [diff] [blame] | 674 | return rc ? ERR_PTR(rc) : buf; |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 675 | } |
| 676 | |
Al Viro | 6b25539 | 2015-11-17 10:20:54 -0500 | [diff] [blame] | 677 | static const char *ecryptfs_get_link(struct dentry *dentry, |
| 678 | struct inode *inode, void **cookie) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 679 | { |
Al Viro | b22e8fe | 2013-11-29 22:51:47 -0500 | [diff] [blame] | 680 | size_t len; |
Al Viro | 6b25539 | 2015-11-17 10:20:54 -0500 | [diff] [blame] | 681 | char *buf; |
| 682 | |
| 683 | if (!dentry) |
| 684 | return ERR_PTR(-ECHILD); |
| 685 | |
| 686 | buf = ecryptfs_readlink_lower(dentry, &len); |
Al Viro | b22e8fe | 2013-11-29 22:51:47 -0500 | [diff] [blame] | 687 | if (IS_ERR(buf)) |
Al Viro | 680baac | 2015-05-02 13:32:22 -0400 | [diff] [blame] | 688 | return buf; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 689 | fsstack_copy_attr_atime(d_inode(dentry), |
| 690 | d_inode(ecryptfs_dentry_to_lower(dentry))); |
Al Viro | 408bd62 | 2012-05-03 09:34:20 -0400 | [diff] [blame] | 691 | buf[len] = '\0'; |
Al Viro | 680baac | 2015-05-02 13:32:22 -0400 | [diff] [blame] | 692 | return *cookie = buf; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 693 | } |
| 694 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 695 | /** |
| 696 | * upper_size_to_lower_size |
| 697 | * @crypt_stat: Crypt_stat associated with file |
| 698 | * @upper_size: Size of the upper file |
| 699 | * |
Michael Halcrow | cc11bef | 2008-02-06 01:38:32 -0800 | [diff] [blame] | 700 | * Calculate the required size of the lower file based on the |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 701 | * specified size of the upper file. This calculation is based on the |
| 702 | * number of headers in the underlying file and the extent size. |
| 703 | * |
| 704 | * Returns Calculated size of the lower file. |
| 705 | */ |
| 706 | static loff_t |
| 707 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, |
| 708 | loff_t upper_size) |
| 709 | { |
| 710 | loff_t lower_size; |
| 711 | |
Tyler Hicks | 157f107 | 2010-02-11 07:10:38 -0600 | [diff] [blame] | 712 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 713 | if (upper_size != 0) { |
| 714 | loff_t num_extents; |
| 715 | |
| 716 | num_extents = upper_size >> crypt_stat->extent_shift; |
| 717 | if (upper_size & ~crypt_stat->extent_mask) |
| 718 | num_extents++; |
| 719 | lower_size += (num_extents * crypt_stat->extent_size); |
| 720 | } |
| 721 | return lower_size; |
| 722 | } |
| 723 | |
| 724 | /** |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 725 | * truncate_upper |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 726 | * @dentry: The ecryptfs layer dentry |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 727 | * @ia: Address of the ecryptfs inode's attributes |
| 728 | * @lower_ia: Address of the lower inode's attributes |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 729 | * |
| 730 | * Function to handle truncations modifying the size of the file. Note |
| 731 | * that the file sizes are interpolated. When expanding, we are simply |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 732 | * writing strings of 0's out. When truncating, we truncate the upper |
| 733 | * inode and update the lower_ia according to the page index |
| 734 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, |
| 735 | * the caller must use lower_ia in a call to notify_change() to perform |
| 736 | * the truncation of the lower inode. |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 737 | * |
| 738 | * Returns zero on success; non-zero otherwise |
| 739 | */ |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 740 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
| 741 | struct iattr *lower_ia) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 742 | { |
| 743 | int rc = 0; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 744 | struct inode *inode = d_inode(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 745 | struct ecryptfs_crypt_stat *crypt_stat; |
| 746 | loff_t i_size = i_size_read(inode); |
| 747 | loff_t lower_size_before_truncate; |
| 748 | loff_t lower_size_after_truncate; |
| 749 | |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 750 | if (unlikely((ia->ia_size == i_size))) { |
| 751 | lower_ia->ia_valid &= ~ATTR_SIZE; |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 752 | return 0; |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 753 | } |
Tyler Hicks | 3b06b3e | 2011-05-24 03:49:02 -0500 | [diff] [blame] | 754 | rc = ecryptfs_get_lower_file(dentry, inode); |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 755 | if (rc) |
| 756 | return rc; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 757 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 758 | /* Switch on growing or shrinking file */ |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 759 | if (ia->ia_size > i_size) { |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 760 | char zero[] = { 0x00 }; |
Michael Halcrow | 240e2df | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 761 | |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 762 | lower_ia->ia_valid &= ~ATTR_SIZE; |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 763 | /* Write a single 0 at the last position of the file; |
| 764 | * this triggers code that will fill in 0's throughout |
| 765 | * the intermediate portion of the previous end of the |
| 766 | * file and the new and of the file */ |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 767 | rc = ecryptfs_write(inode, zero, |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 768 | (ia->ia_size - 1), 1); |
| 769 | } else { /* ia->ia_size < i_size_read(inode) */ |
| 770 | /* We're chopping off all the pages down to the page |
| 771 | * in which ia->ia_size is located. Fill in the end of |
| 772 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 773 | * PAGE_CACHE_SIZE with zeros. */ |
| 774 | size_t num_zeros = (PAGE_CACHE_SIZE |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 775 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 776 | |
Tyler Hicks | 13a791b | 2009-04-13 15:29:27 -0500 | [diff] [blame] | 777 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
Christoph Hellwig | 2c27c65 | 2010-06-04 11:30:04 +0200 | [diff] [blame] | 778 | truncate_setsize(inode, ia->ia_size); |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 779 | lower_ia->ia_size = ia->ia_size; |
| 780 | lower_ia->ia_valid |= ATTR_SIZE; |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 781 | goto out; |
Tyler Hicks | 13a791b | 2009-04-13 15:29:27 -0500 | [diff] [blame] | 782 | } |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 783 | if (num_zeros) { |
| 784 | char *zeros_virt; |
| 785 | |
| 786 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); |
| 787 | if (!zeros_virt) { |
| 788 | rc = -ENOMEM; |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 789 | goto out; |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 790 | } |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 791 | rc = ecryptfs_write(inode, zeros_virt, |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 792 | ia->ia_size, num_zeros); |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 793 | kfree(zeros_virt); |
Michael Halcrow | 5dda699 | 2007-10-16 01:28:06 -0700 | [diff] [blame] | 794 | if (rc) { |
Michael Halcrow | 240e2df | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 795 | printk(KERN_ERR "Error attempting to zero out " |
| 796 | "the remainder of the end page on " |
| 797 | "reducing truncate; rc = [%d]\n", rc); |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 798 | goto out; |
Michael Halcrow | 240e2df | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 799 | } |
| 800 | } |
Christoph Hellwig | 2c27c65 | 2010-06-04 11:30:04 +0200 | [diff] [blame] | 801 | truncate_setsize(inode, ia->ia_size); |
Michael Halcrow | 0216f7f | 2007-10-16 01:28:08 -0700 | [diff] [blame] | 802 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 803 | if (rc) { |
| 804 | printk(KERN_ERR "Problem with " |
| 805 | "ecryptfs_write_inode_size_to_metadata; " |
| 806 | "rc = [%d]\n", rc); |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 807 | goto out; |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 808 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 809 | /* We are reducing the size of the ecryptfs file, and need to |
| 810 | * know if we need to reduce the size of the lower file. */ |
| 811 | lower_size_before_truncate = |
| 812 | upper_size_to_lower_size(crypt_stat, i_size); |
| 813 | lower_size_after_truncate = |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 814 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
| 815 | if (lower_size_after_truncate < lower_size_before_truncate) { |
| 816 | lower_ia->ia_size = lower_size_after_truncate; |
| 817 | lower_ia->ia_valid |= ATTR_SIZE; |
| 818 | } else |
| 819 | lower_ia->ia_valid &= ~ATTR_SIZE; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 820 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 821 | out: |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 822 | ecryptfs_put_lower_file(inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 823 | return rc; |
| 824 | } |
| 825 | |
Tyler Hicks | a261a03 | 2012-01-19 20:33:44 -0600 | [diff] [blame] | 826 | static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) |
| 827 | { |
| 828 | struct ecryptfs_crypt_stat *crypt_stat; |
| 829 | loff_t lower_oldsize, lower_newsize; |
| 830 | |
| 831 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; |
| 832 | lower_oldsize = upper_size_to_lower_size(crypt_stat, |
| 833 | i_size_read(inode)); |
| 834 | lower_newsize = upper_size_to_lower_size(crypt_stat, offset); |
| 835 | if (lower_newsize > lower_oldsize) { |
| 836 | /* |
| 837 | * The eCryptfs inode and the new *lower* size are mixed here |
| 838 | * because we may not have the lower i_mutex held and/or it may |
| 839 | * not be appropriate to call inode_newsize_ok() with inodes |
| 840 | * from other filesystems. |
| 841 | */ |
| 842 | return inode_newsize_ok(inode, lower_newsize); |
| 843 | } |
| 844 | |
| 845 | return 0; |
| 846 | } |
| 847 | |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 848 | /** |
| 849 | * ecryptfs_truncate |
| 850 | * @dentry: The ecryptfs layer dentry |
| 851 | * @new_length: The length to expand the file to |
| 852 | * |
| 853 | * Simple function that handles the truncation of an eCryptfs inode and |
| 854 | * its corresponding lower inode. |
| 855 | * |
| 856 | * Returns zero on success; non-zero otherwise |
| 857 | */ |
| 858 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) |
| 859 | { |
| 860 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; |
| 861 | struct iattr lower_ia = { .ia_valid = 0 }; |
| 862 | int rc; |
| 863 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 864 | rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); |
Tyler Hicks | a261a03 | 2012-01-19 20:33:44 -0600 | [diff] [blame] | 865 | if (rc) |
| 866 | return rc; |
| 867 | |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 868 | rc = truncate_upper(dentry, &ia, &lower_ia); |
| 869 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { |
| 870 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 871 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 872 | mutex_lock(&d_inode(lower_dentry)->i_mutex); |
J. Bruce Fields | 27ac0ff | 2011-09-20 17:19:26 -0400 | [diff] [blame] | 873 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 874 | mutex_unlock(&d_inode(lower_dentry)->i_mutex); |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 875 | } |
| 876 | return rc; |
| 877 | } |
| 878 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 879 | static int |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 880 | ecryptfs_permission(struct inode *inode, int mask) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 881 | { |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 882 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 883 | } |
| 884 | |
| 885 | /** |
| 886 | * ecryptfs_setattr |
| 887 | * @dentry: dentry handle to the inode to modify |
| 888 | * @ia: Structure with flags of what to change and values |
| 889 | * |
| 890 | * Updates the metadata of an inode. If the update is to the size |
| 891 | * i.e. truncation, then ecryptfs_truncate will handle the size modification |
| 892 | * of both the ecryptfs inode and the lower inode. |
| 893 | * |
| 894 | * All other metadata changes will be passed right to the lower filesystem, |
| 895 | * and we will just update our inode to look like the lower. |
| 896 | */ |
| 897 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) |
| 898 | { |
| 899 | int rc = 0; |
| 900 | struct dentry *lower_dentry; |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 901 | struct iattr lower_ia; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 902 | struct inode *inode; |
| 903 | struct inode *lower_inode; |
| 904 | struct ecryptfs_crypt_stat *crypt_stat; |
| 905 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 906 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 907 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
| 908 | ecryptfs_init_crypt_stat(crypt_stat); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 909 | inode = d_inode(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 910 | lower_inode = ecryptfs_inode_to_lower(inode); |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 911 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 912 | mutex_lock(&crypt_stat->cs_mutex); |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 913 | if (d_is_dir(dentry)) |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 914 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 915 | else if (d_is_reg(dentry) |
Michael Halcrow | 64ee480 | 2007-07-19 01:47:54 -0700 | [diff] [blame] | 916 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) |
| 917 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 918 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 919 | |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 920 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
| 921 | dentry->d_sb)->mount_crypt_stat; |
Tyler Hicks | 3b06b3e | 2011-05-24 03:49:02 -0500 | [diff] [blame] | 922 | rc = ecryptfs_get_lower_file(dentry, inode); |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 923 | if (rc) { |
| 924 | mutex_unlock(&crypt_stat->cs_mutex); |
| 925 | goto out; |
| 926 | } |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 927 | rc = ecryptfs_read_metadata(dentry); |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 928 | ecryptfs_put_lower_file(inode); |
Michael Halcrow | 5dda699 | 2007-10-16 01:28:06 -0700 | [diff] [blame] | 929 | if (rc) { |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 930 | if (!(mount_crypt_stat->flags |
| 931 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { |
| 932 | rc = -EIO; |
Michael Halcrow | 25bd817 | 2008-02-06 01:38:35 -0800 | [diff] [blame] | 933 | printk(KERN_WARNING "Either the lower file " |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 934 | "is not in a valid eCryptfs format, " |
Michael Halcrow | 25bd817 | 2008-02-06 01:38:35 -0800 | [diff] [blame] | 935 | "or the key could not be retrieved. " |
| 936 | "Plaintext passthrough mode is not " |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 937 | "enabled; returning -EIO\n"); |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 938 | mutex_unlock(&crypt_stat->cs_mutex); |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 939 | goto out; |
| 940 | } |
| 941 | rc = 0; |
Tyler Hicks | 3aeb86e | 2011-03-15 14:54:00 -0500 | [diff] [blame] | 942 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
| 943 | | ECRYPTFS_ENCRYPTED); |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 944 | } |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 945 | } |
| 946 | mutex_unlock(&crypt_stat->cs_mutex); |
Tyler Hicks | a261a03 | 2012-01-19 20:33:44 -0600 | [diff] [blame] | 947 | |
| 948 | rc = inode_change_ok(inode, ia); |
| 949 | if (rc) |
| 950 | goto out; |
| 951 | if (ia->ia_valid & ATTR_SIZE) { |
| 952 | rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); |
| 953 | if (rc) |
| 954 | goto out; |
| 955 | } |
| 956 | |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 957 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
| 958 | if (ia->ia_valid & ATTR_FILE) |
| 959 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 960 | if (ia->ia_valid & ATTR_SIZE) { |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 961 | rc = truncate_upper(dentry, ia, &lower_ia); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 962 | if (rc < 0) |
| 963 | goto out; |
| 964 | } |
Jeff Layton | 1ac564e | 2007-10-18 03:05:17 -0700 | [diff] [blame] | 965 | |
| 966 | /* |
| 967 | * mode change is for clearing setuid/setgid bits. Allow lower fs |
| 968 | * to interpret this in its own way. |
| 969 | */ |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 970 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
| 971 | lower_ia.ia_valid &= ~ATTR_MODE; |
Jeff Layton | 1ac564e | 2007-10-18 03:05:17 -0700 | [diff] [blame] | 972 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 973 | mutex_lock(&d_inode(lower_dentry)->i_mutex); |
J. Bruce Fields | 27ac0ff | 2011-09-20 17:19:26 -0400 | [diff] [blame] | 974 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 975 | mutex_unlock(&d_inode(lower_dentry)->i_mutex); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 976 | out: |
Erez Zadok | 9afa2fb | 2009-12-02 19:51:54 -0500 | [diff] [blame] | 977 | fsstack_copy_attr_all(inode, lower_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 978 | return rc; |
| 979 | } |
| 980 | |
Tyler Hicks | 111d61a | 2013-01-17 12:19:35 -0800 | [diff] [blame] | 981 | static int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
| 982 | struct kstat *stat) |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 983 | { |
| 984 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
| 985 | int rc = 0; |
| 986 | |
| 987 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
| 988 | dentry->d_sb)->mount_crypt_stat; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 989 | generic_fillattr(d_inode(dentry), stat); |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 990 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
| 991 | char *target; |
| 992 | size_t targetsiz; |
| 993 | |
Al Viro | b22e8fe | 2013-11-29 22:51:47 -0500 | [diff] [blame] | 994 | target = ecryptfs_readlink_lower(dentry, &targetsiz); |
| 995 | if (!IS_ERR(target)) { |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 996 | kfree(target); |
| 997 | stat->size = targetsiz; |
Al Viro | b22e8fe | 2013-11-29 22:51:47 -0500 | [diff] [blame] | 998 | } else { |
| 999 | rc = PTR_ERR(target); |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 1000 | } |
| 1001 | } |
| 1002 | return rc; |
| 1003 | } |
| 1004 | |
Tyler Hicks | 111d61a | 2013-01-17 12:19:35 -0800 | [diff] [blame] | 1005 | static int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| 1006 | struct kstat *stat) |
Tyler Hicks | f8f484d | 2009-11-04 02:48:01 -0600 | [diff] [blame] | 1007 | { |
| 1008 | struct kstat lower_stat; |
| 1009 | int rc; |
| 1010 | |
Al Viro | 3dadecc | 2013-01-24 02:18:08 -0500 | [diff] [blame] | 1011 | rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat); |
Tyler Hicks | f8f484d | 2009-11-04 02:48:01 -0600 | [diff] [blame] | 1012 | if (!rc) { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1013 | fsstack_copy_attr_all(d_inode(dentry), |
| 1014 | ecryptfs_inode_to_lower(d_inode(dentry))); |
| 1015 | generic_fillattr(d_inode(dentry), stat); |
Tyler Hicks | f8f484d | 2009-11-04 02:48:01 -0600 | [diff] [blame] | 1016 | stat->blocks = lower_stat.blocks; |
| 1017 | } |
| 1018 | return rc; |
| 1019 | } |
| 1020 | |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 1021 | int |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1022 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
| 1023 | size_t size, int flags) |
| 1024 | { |
| 1025 | int rc = 0; |
| 1026 | struct dentry *lower_dentry; |
| 1027 | |
| 1028 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1029 | if (!d_inode(lower_dentry)->i_op->setxattr) { |
Christian Pulvermacher | cfce08c | 2010-03-23 11:51:38 -0500 | [diff] [blame] | 1030 | rc = -EOPNOTSUPP; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1031 | goto out; |
| 1032 | } |
Roberto Sassu | 48b512e | 2010-10-05 18:53:45 +0200 | [diff] [blame] | 1033 | |
| 1034 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1035 | if (!rc && d_really_is_positive(dentry)) |
| 1036 | fsstack_copy_attr_all(d_inode(dentry), d_inode(lower_dentry)); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1037 | out: |
| 1038 | return rc; |
| 1039 | } |
| 1040 | |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 1041 | ssize_t |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 1042 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, |
| 1043 | void *value, size_t size) |
| 1044 | { |
| 1045 | int rc = 0; |
| 1046 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1047 | if (!d_inode(lower_dentry)->i_op->getxattr) { |
Christian Pulvermacher | cfce08c | 2010-03-23 11:51:38 -0500 | [diff] [blame] | 1048 | rc = -EOPNOTSUPP; |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 1049 | goto out; |
| 1050 | } |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1051 | mutex_lock(&d_inode(lower_dentry)->i_mutex); |
| 1052 | rc = d_inode(lower_dentry)->i_op->getxattr(lower_dentry, name, value, |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 1053 | size); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1054 | mutex_unlock(&d_inode(lower_dentry)->i_mutex); |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 1055 | out: |
| 1056 | return rc; |
| 1057 | } |
| 1058 | |
Adrian Bunk | 7896b63 | 2008-02-06 01:38:32 -0800 | [diff] [blame] | 1059 | static ssize_t |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1060 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
| 1061 | size_t size) |
| 1062 | { |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 1063 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
| 1064 | value, size); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1065 | } |
| 1066 | |
| 1067 | static ssize_t |
| 1068 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) |
| 1069 | { |
| 1070 | int rc = 0; |
| 1071 | struct dentry *lower_dentry; |
| 1072 | |
| 1073 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1074 | if (!d_inode(lower_dentry)->i_op->listxattr) { |
Christian Pulvermacher | cfce08c | 2010-03-23 11:51:38 -0500 | [diff] [blame] | 1075 | rc = -EOPNOTSUPP; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1076 | goto out; |
| 1077 | } |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1078 | mutex_lock(&d_inode(lower_dentry)->i_mutex); |
| 1079 | rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); |
| 1080 | mutex_unlock(&d_inode(lower_dentry)->i_mutex); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1081 | out: |
| 1082 | return rc; |
| 1083 | } |
| 1084 | |
| 1085 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) |
| 1086 | { |
| 1087 | int rc = 0; |
| 1088 | struct dentry *lower_dentry; |
| 1089 | |
| 1090 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1091 | if (!d_inode(lower_dentry)->i_op->removexattr) { |
Christian Pulvermacher | cfce08c | 2010-03-23 11:51:38 -0500 | [diff] [blame] | 1092 | rc = -EOPNOTSUPP; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1093 | goto out; |
| 1094 | } |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1095 | mutex_lock(&d_inode(lower_dentry)->i_mutex); |
| 1096 | rc = d_inode(lower_dentry)->i_op->removexattr(lower_dentry, name); |
| 1097 | mutex_unlock(&d_inode(lower_dentry)->i_mutex); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1098 | out: |
| 1099 | return rc; |
| 1100 | } |
| 1101 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1102 | const struct inode_operations ecryptfs_symlink_iops = { |
Al Viro | 408bd62 | 2012-05-03 09:34:20 -0400 | [diff] [blame] | 1103 | .readlink = generic_readlink, |
Al Viro | 6b25539 | 2015-11-17 10:20:54 -0500 | [diff] [blame] | 1104 | .get_link = ecryptfs_get_link, |
Al Viro | 87dc800 | 2013-09-16 10:30:04 -0400 | [diff] [blame] | 1105 | .put_link = kfree_put_link, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1106 | .permission = ecryptfs_permission, |
| 1107 | .setattr = ecryptfs_setattr, |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 1108 | .getattr = ecryptfs_getattr_link, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1109 | .setxattr = ecryptfs_setxattr, |
| 1110 | .getxattr = ecryptfs_getxattr, |
| 1111 | .listxattr = ecryptfs_listxattr, |
| 1112 | .removexattr = ecryptfs_removexattr |
| 1113 | }; |
| 1114 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1115 | const struct inode_operations ecryptfs_dir_iops = { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1116 | .create = ecryptfs_create, |
| 1117 | .lookup = ecryptfs_lookup, |
| 1118 | .link = ecryptfs_link, |
| 1119 | .unlink = ecryptfs_unlink, |
| 1120 | .symlink = ecryptfs_symlink, |
| 1121 | .mkdir = ecryptfs_mkdir, |
| 1122 | .rmdir = ecryptfs_rmdir, |
| 1123 | .mknod = ecryptfs_mknod, |
| 1124 | .rename = ecryptfs_rename, |
| 1125 | .permission = ecryptfs_permission, |
| 1126 | .setattr = ecryptfs_setattr, |
| 1127 | .setxattr = ecryptfs_setxattr, |
| 1128 | .getxattr = ecryptfs_getxattr, |
| 1129 | .listxattr = ecryptfs_listxattr, |
| 1130 | .removexattr = ecryptfs_removexattr |
| 1131 | }; |
| 1132 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1133 | const struct inode_operations ecryptfs_main_iops = { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1134 | .permission = ecryptfs_permission, |
| 1135 | .setattr = ecryptfs_setattr, |
Tyler Hicks | f8f484d | 2009-11-04 02:48:01 -0600 | [diff] [blame] | 1136 | .getattr = ecryptfs_getattr, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1137 | .setxattr = ecryptfs_setxattr, |
| 1138 | .getxattr = ecryptfs_getxattr, |
| 1139 | .listxattr = ecryptfs_listxattr, |
| 1140 | .removexattr = ecryptfs_removexattr |
| 1141 | }; |