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1// SPDX-License-Identifier: GPL-2.0-or-later
2/**
3 * eCryptfs: Linux filesystem encryption layer
4 *
5 * Copyright (C) 1997-2004 Erez Zadok
6 * Copyright (C) 2001-2004 Stony Brook University
7 * Copyright (C) 2004-2007 International Business Machines Corp.
8 * Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
9 * Michael C. Thompson <mcthomps@us.ibm.com>
10 */
11
12#include <linux/file.h>
13#include <linux/poll.h>
14#include <linux/slab.h>
15#include <linux/mount.h>
16#include <linux/pagemap.h>
17#include <linux/security.h>
18#include <linux/compat.h>
19#include <linux/fs_stack.h>
20#include "ecryptfs_kernel.h"
21
22/**
23 * ecryptfs_read_update_atime
24 *
25 * generic_file_read updates the atime of upper layer inode. But, it
26 * doesn't give us a chance to update the atime of the lower layer
27 * inode. This function is a wrapper to generic_file_read. It
28 * updates the atime of the lower level inode if generic_file_read
29 * returns without any errors. This is to be used only for file reads.
30 * The function to be used for directory reads is ecryptfs_read.
31 */
32static ssize_t ecryptfs_read_update_atime(struct kiocb *iocb,
33 struct iov_iter *to)
34{
35 ssize_t rc;
36 struct path *path;
37 struct file *file = iocb->ki_filp;
38
39 rc = generic_file_read_iter(iocb, to);
40 if (rc >= 0) {
41 path = ecryptfs_dentry_to_lower_path(file->f_path.dentry);
42 touch_atime(path);
43 }
44 return rc;
45}
46
47struct ecryptfs_getdents_callback {
48 struct dir_context ctx;
49 struct dir_context *caller;
50 struct super_block *sb;
51 int filldir_called;
52 int entries_written;
53};
54
55/* Inspired by generic filldir in fs/readdir.c */
56static int
57ecryptfs_filldir(struct dir_context *ctx, const char *lower_name,
58 int lower_namelen, loff_t offset, u64 ino, unsigned int d_type)
59{
60 struct ecryptfs_getdents_callback *buf =
61 container_of(ctx, struct ecryptfs_getdents_callback, ctx);
62 size_t name_size;
63 char *name;
64 int rc;
65
66 buf->filldir_called++;
67 rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
68 buf->sb, lower_name,
69 lower_namelen);
70 if (rc) {
71 if (rc != -EINVAL) {
72 ecryptfs_printk(KERN_DEBUG,
73 "%s: Error attempting to decode and decrypt filename [%s]; rc = [%d]\n",
74 __func__, lower_name, rc);
75 return rc;
76 }
77
78 /* Mask -EINVAL errors as these are most likely due a plaintext
79 * filename present in the lower filesystem despite filename
80 * encryption being enabled. One unavoidable example would be
81 * the "lost+found" dentry in the root directory of an Ext4
82 * filesystem.
83 */
84 return 0;
85 }
86
87 buf->caller->pos = buf->ctx.pos;
88 rc = !dir_emit(buf->caller, name, name_size, ino, d_type);
89 kfree(name);
90 if (!rc)
91 buf->entries_written++;
92
93 return rc;
94}
95
96/**
97 * ecryptfs_readdir
98 * @file: The eCryptfs directory file
99 * @ctx: The actor to feed the entries to
100 */
101static int ecryptfs_readdir(struct file *file, struct dir_context *ctx)
102{
103 int rc;
104 struct file *lower_file;
105 struct inode *inode = file_inode(file);
106 struct ecryptfs_getdents_callback buf = {
107 .ctx.actor = ecryptfs_filldir,
108 .caller = ctx,
109 .sb = inode->i_sb,
110 };
111 lower_file = ecryptfs_file_to_lower(file);
112 rc = iterate_dir(lower_file, &buf.ctx);
113 ctx->pos = buf.ctx.pos;
114 if (rc < 0)
115 goto out;
116 if (buf.filldir_called && !buf.entries_written)
117 goto out;
118 if (rc >= 0)
119 fsstack_copy_attr_atime(inode,
120 file_inode(lower_file));
121out:
122 return rc;
123}
124
125struct kmem_cache *ecryptfs_file_info_cache;
126
127static int read_or_initialize_metadata(struct dentry *dentry)
128{
129 struct inode *inode = d_inode(dentry);
130 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
131 struct ecryptfs_crypt_stat *crypt_stat;
132 int rc;
133
134 crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
135 mount_crypt_stat = &ecryptfs_superblock_to_private(
136 inode->i_sb)->mount_crypt_stat;
137 mutex_lock(&crypt_stat->cs_mutex);
138
139 if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED &&
140 crypt_stat->flags & ECRYPTFS_KEY_VALID) {
141 rc = 0;
142 goto out;
143 }
144
145 rc = ecryptfs_read_metadata(dentry);
146 if (!rc)
147 goto out;
148
149 if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) {
150 crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
151 | ECRYPTFS_ENCRYPTED);
152 rc = 0;
153 goto out;
154 }
155
156 if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) &&
157 !i_size_read(ecryptfs_inode_to_lower(inode))) {
158 rc = ecryptfs_initialize_file(dentry, inode);
159 if (!rc)
160 goto out;
161 }
162
163 rc = -EIO;
164out:
165 mutex_unlock(&crypt_stat->cs_mutex);
166 return rc;
167}
168
169static int ecryptfs_mmap(struct file *file, struct vm_area_struct *vma)
170{
171 struct file *lower_file = ecryptfs_file_to_lower(file);
172 /*
173 * Don't allow mmap on top of file systems that don't support it
174 * natively. If FILESYSTEM_MAX_STACK_DEPTH > 2 or ecryptfs
175 * allows recursive mounting, this will need to be extended.
176 */
177 if (!lower_file->f_op->mmap)
178 return -ENODEV;
179 return generic_file_mmap(file, vma);
180}
181
182/**
183 * ecryptfs_open
184 * @inode: inode specifying file to open
185 * @file: Structure to return filled in
186 *
187 * Opens the file specified by inode.
188 *
189 * Returns zero on success; non-zero otherwise
190 */
191static int ecryptfs_open(struct inode *inode, struct file *file)
192{
193 int rc = 0;
194 struct ecryptfs_crypt_stat *crypt_stat = NULL;
195 struct dentry *ecryptfs_dentry = file->f_path.dentry;
196 /* Private value of ecryptfs_dentry allocated in
197 * ecryptfs_lookup() */
198 struct ecryptfs_file_info *file_info;
199
200 /* Released in ecryptfs_release or end of function if failure */
201 file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
202 ecryptfs_set_file_private(file, file_info);
203 if (!file_info) {
204 ecryptfs_printk(KERN_ERR,
205 "Error attempting to allocate memory\n");
206 rc = -ENOMEM;
207 goto out;
208 }
209 crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
210 mutex_lock(&crypt_stat->cs_mutex);
211 if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
212 ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
213 /* Policy code enabled in future release */
214 crypt_stat->flags |= (ECRYPTFS_POLICY_APPLIED
215 | ECRYPTFS_ENCRYPTED);
216 }
217 mutex_unlock(&crypt_stat->cs_mutex);
218 rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
219 if (rc) {
220 printk(KERN_ERR "%s: Error attempting to initialize "
221 "the lower file for the dentry with name "
222 "[%pd]; rc = [%d]\n", __func__,
223 ecryptfs_dentry, rc);
224 goto out_free;
225 }
226 if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
227 == O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
228 rc = -EPERM;
229 printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
230 "file must hence be opened RO\n", __func__);
231 goto out_put;
232 }
233 ecryptfs_set_file_lower(
234 file, ecryptfs_inode_to_private(inode)->lower_file);
235 rc = read_or_initialize_metadata(ecryptfs_dentry);
236 if (rc)
237 goto out_put;
238 ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
239 "[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
240 (unsigned long long)i_size_read(inode));
241 goto out;
242out_put:
243 ecryptfs_put_lower_file(inode);
244out_free:
245 kmem_cache_free(ecryptfs_file_info_cache,
246 ecryptfs_file_to_private(file));
247out:
248 return rc;
249}
250
251/**
252 * ecryptfs_dir_open
253 * @inode: inode specifying file to open
254 * @file: Structure to return filled in
255 *
256 * Opens the file specified by inode.
257 *
258 * Returns zero on success; non-zero otherwise
259 */
260static int ecryptfs_dir_open(struct inode *inode, struct file *file)
261{
262 struct dentry *ecryptfs_dentry = file->f_path.dentry;
263 /* Private value of ecryptfs_dentry allocated in
264 * ecryptfs_lookup() */
265 struct ecryptfs_file_info *file_info;
266 struct file *lower_file;
267
268 /* Released in ecryptfs_release or end of function if failure */
269 file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
270 ecryptfs_set_file_private(file, file_info);
271 if (unlikely(!file_info)) {
272 ecryptfs_printk(KERN_ERR,
273 "Error attempting to allocate memory\n");
274 return -ENOMEM;
275 }
276 lower_file = dentry_open(ecryptfs_dentry_to_lower_path(ecryptfs_dentry),
277 file->f_flags, current_cred());
278 if (IS_ERR(lower_file)) {
279 printk(KERN_ERR "%s: Error attempting to initialize "
280 "the lower file for the dentry with name "
281 "[%pd]; rc = [%ld]\n", __func__,
282 ecryptfs_dentry, PTR_ERR(lower_file));
283 kmem_cache_free(ecryptfs_file_info_cache, file_info);
284 return PTR_ERR(lower_file);
285 }
286 ecryptfs_set_file_lower(file, lower_file);
287 return 0;
288}
289
290static int ecryptfs_flush(struct file *file, fl_owner_t td)
291{
292 struct file *lower_file = ecryptfs_file_to_lower(file);
293
294 if (lower_file->f_op->flush) {
295 filemap_write_and_wait(file->f_mapping);
296 return lower_file->f_op->flush(lower_file, td);
297 }
298
299 return 0;
300}
301
302static int ecryptfs_release(struct inode *inode, struct file *file)
303{
304 ecryptfs_put_lower_file(inode);
305 kmem_cache_free(ecryptfs_file_info_cache,
306 ecryptfs_file_to_private(file));
307 return 0;
308}
309
310static int ecryptfs_dir_release(struct inode *inode, struct file *file)
311{
312 fput(ecryptfs_file_to_lower(file));
313 kmem_cache_free(ecryptfs_file_info_cache,
314 ecryptfs_file_to_private(file));
315 return 0;
316}
317
318static loff_t ecryptfs_dir_llseek(struct file *file, loff_t offset, int whence)
319{
320 return vfs_llseek(ecryptfs_file_to_lower(file), offset, whence);
321}
322
323static int
324ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
325{
326 int rc;
327
328 rc = file_write_and_wait(file);
329 if (rc)
330 return rc;
331
332 return vfs_fsync(ecryptfs_file_to_lower(file), datasync);
333}
334
335static int ecryptfs_fasync(int fd, struct file *file, int flag)
336{
337 int rc = 0;
338 struct file *lower_file = NULL;
339
340 lower_file = ecryptfs_file_to_lower(file);
341 if (lower_file->f_op->fasync)
342 rc = lower_file->f_op->fasync(fd, lower_file, flag);
343 return rc;
344}
345
346static long
347ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
348{
349 struct file *lower_file = ecryptfs_file_to_lower(file);
350 long rc = -ENOTTY;
351
352 if (!lower_file->f_op->unlocked_ioctl)
353 return rc;
354
355 switch (cmd) {
356 case FITRIM:
357 case FS_IOC_GETFLAGS:
358 case FS_IOC_SETFLAGS:
359 case FS_IOC_GETVERSION:
360 case FS_IOC_SETVERSION:
361 rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
362 fsstack_copy_attr_all(file_inode(file), file_inode(lower_file));
363
364 return rc;
365 default:
366 return rc;
367 }
368}
369
370#ifdef CONFIG_COMPAT
371static long
372ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
373{
374 struct file *lower_file = ecryptfs_file_to_lower(file);
375 long rc = -ENOIOCTLCMD;
376
377 if (!lower_file->f_op->compat_ioctl)
378 return rc;
379
380 switch (cmd) {
381 case FITRIM:
382 case FS_IOC32_GETFLAGS:
383 case FS_IOC32_SETFLAGS:
384 case FS_IOC32_GETVERSION:
385 case FS_IOC32_SETVERSION:
386 rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
387 fsstack_copy_attr_all(file_inode(file), file_inode(lower_file));
388
389 return rc;
390 default:
391 return rc;
392 }
393}
394#endif
395
396const struct file_operations ecryptfs_dir_fops = {
397 .iterate_shared = ecryptfs_readdir,
398 .read = generic_read_dir,
399 .unlocked_ioctl = ecryptfs_unlocked_ioctl,
400#ifdef CONFIG_COMPAT
401 .compat_ioctl = ecryptfs_compat_ioctl,
402#endif
403 .open = ecryptfs_dir_open,
404 .release = ecryptfs_dir_release,
405 .fsync = ecryptfs_fsync,
406 .llseek = ecryptfs_dir_llseek,
407};
408
409const struct file_operations ecryptfs_main_fops = {
410 .llseek = generic_file_llseek,
411 .read_iter = ecryptfs_read_update_atime,
412 .write_iter = generic_file_write_iter,
413 .unlocked_ioctl = ecryptfs_unlocked_ioctl,
414#ifdef CONFIG_COMPAT
415 .compat_ioctl = ecryptfs_compat_ioctl,
416#endif
417 .mmap = ecryptfs_mmap,
418 .open = ecryptfs_open,
419 .flush = ecryptfs_flush,
420 .release = ecryptfs_release,
421 .fsync = ecryptfs_fsync,
422 .fasync = ecryptfs_fasync,
423 .splice_read = generic_file_splice_read,
424};
1/**
2 * eCryptfs: Linux filesystem encryption layer
3 *
4 * Copyright (C) 1997-2004 Erez Zadok
5 * Copyright (C) 2001-2004 Stony Brook University
6 * Copyright (C) 2004-2007 International Business Machines Corp.
7 * Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
8 * Michael C. Thompson <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/poll.h>
28#include <linux/slab.h>
29#include <linux/mount.h>
30#include <linux/pagemap.h>
31#include <linux/security.h>
32#include <linux/compat.h>
33#include <linux/fs_stack.h>
34#include "ecryptfs_kernel.h"
35
36/**
37 * ecryptfs_read_update_atime
38 *
39 * generic_file_read updates the atime of upper layer inode. But, it
40 * doesn't give us a chance to update the atime of the lower layer
41 * inode. This function is a wrapper to generic_file_read. It
42 * updates the atime of the lower level inode if generic_file_read
43 * returns without any errors. This is to be used only for file reads.
44 * The function to be used for directory reads is ecryptfs_read.
45 */
46static ssize_t ecryptfs_read_update_atime(struct kiocb *iocb,
47 const struct iovec *iov,
48 unsigned long nr_segs, loff_t pos)
49{
50 ssize_t rc;
51 struct path lower;
52 struct file *file = iocb->ki_filp;
53
54 rc = generic_file_aio_read(iocb, iov, nr_segs, pos);
55 /*
56 * Even though this is a async interface, we need to wait
57 * for IO to finish to update atime
58 */
59 if (-EIOCBQUEUED == rc)
60 rc = wait_on_sync_kiocb(iocb);
61 if (rc >= 0) {
62 lower.dentry = ecryptfs_dentry_to_lower(file->f_path.dentry);
63 lower.mnt = ecryptfs_dentry_to_lower_mnt(file->f_path.dentry);
64 touch_atime(&lower);
65 }
66 return rc;
67}
68
69struct ecryptfs_getdents_callback {
70 void *dirent;
71 struct dentry *dentry;
72 filldir_t filldir;
73 int filldir_called;
74 int entries_written;
75};
76
77/* Inspired by generic filldir in fs/readdir.c */
78static int
79ecryptfs_filldir(void *dirent, const char *lower_name, int lower_namelen,
80 loff_t offset, u64 ino, unsigned int d_type)
81{
82 struct ecryptfs_getdents_callback *buf =
83 (struct ecryptfs_getdents_callback *)dirent;
84 size_t name_size;
85 char *name;
86 int rc;
87
88 buf->filldir_called++;
89 rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
90 buf->dentry, lower_name,
91 lower_namelen);
92 if (rc) {
93 printk(KERN_ERR "%s: Error attempting to decode and decrypt "
94 "filename [%s]; rc = [%d]\n", __func__, lower_name,
95 rc);
96 goto out;
97 }
98 rc = buf->filldir(buf->dirent, name, name_size, offset, ino, d_type);
99 kfree(name);
100 if (rc >= 0)
101 buf->entries_written++;
102out:
103 return rc;
104}
105
106/**
107 * ecryptfs_readdir
108 * @file: The eCryptfs directory file
109 * @dirent: Directory entry handle
110 * @filldir: The filldir callback function
111 */
112static int ecryptfs_readdir(struct file *file, void *dirent, filldir_t filldir)
113{
114 int rc;
115 struct file *lower_file;
116 struct inode *inode;
117 struct ecryptfs_getdents_callback buf;
118
119 lower_file = ecryptfs_file_to_lower(file);
120 lower_file->f_pos = file->f_pos;
121 inode = file->f_path.dentry->d_inode;
122 memset(&buf, 0, sizeof(buf));
123 buf.dirent = dirent;
124 buf.dentry = file->f_path.dentry;
125 buf.filldir = filldir;
126 buf.filldir_called = 0;
127 buf.entries_written = 0;
128 rc = vfs_readdir(lower_file, ecryptfs_filldir, (void *)&buf);
129 file->f_pos = lower_file->f_pos;
130 if (rc < 0)
131 goto out;
132 if (buf.filldir_called && !buf.entries_written)
133 goto out;
134 if (rc >= 0)
135 fsstack_copy_attr_atime(inode,
136 lower_file->f_path.dentry->d_inode);
137out:
138 return rc;
139}
140
141static void ecryptfs_vma_close(struct vm_area_struct *vma)
142{
143 filemap_write_and_wait(vma->vm_file->f_mapping);
144}
145
146static const struct vm_operations_struct ecryptfs_file_vm_ops = {
147 .close = ecryptfs_vma_close,
148 .fault = filemap_fault,
149};
150
151static int ecryptfs_file_mmap(struct file *file, struct vm_area_struct *vma)
152{
153 int rc;
154
155 rc = generic_file_mmap(file, vma);
156 if (!rc)
157 vma->vm_ops = &ecryptfs_file_vm_ops;
158
159 return rc;
160}
161
162struct kmem_cache *ecryptfs_file_info_cache;
163
164/**
165 * ecryptfs_open
166 * @inode: inode speciying file to open
167 * @file: Structure to return filled in
168 *
169 * Opens the file specified by inode.
170 *
171 * Returns zero on success; non-zero otherwise
172 */
173static int ecryptfs_open(struct inode *inode, struct file *file)
174{
175 int rc = 0;
176 struct ecryptfs_crypt_stat *crypt_stat = NULL;
177 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
178 struct dentry *ecryptfs_dentry = file->f_path.dentry;
179 /* Private value of ecryptfs_dentry allocated in
180 * ecryptfs_lookup() */
181 struct dentry *lower_dentry;
182 struct ecryptfs_file_info *file_info;
183
184 mount_crypt_stat = &ecryptfs_superblock_to_private(
185 ecryptfs_dentry->d_sb)->mount_crypt_stat;
186 if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
187 && ((file->f_flags & O_WRONLY) || (file->f_flags & O_RDWR)
188 || (file->f_flags & O_CREAT) || (file->f_flags & O_TRUNC)
189 || (file->f_flags & O_APPEND))) {
190 printk(KERN_WARNING "Mount has encrypted view enabled; "
191 "files may only be read\n");
192 rc = -EPERM;
193 goto out;
194 }
195 /* Released in ecryptfs_release or end of function if failure */
196 file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
197 ecryptfs_set_file_private(file, file_info);
198 if (!file_info) {
199 ecryptfs_printk(KERN_ERR,
200 "Error attempting to allocate memory\n");
201 rc = -ENOMEM;
202 goto out;
203 }
204 lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
205 crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
206 mutex_lock(&crypt_stat->cs_mutex);
207 if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
208 ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
209 /* Policy code enabled in future release */
210 crypt_stat->flags |= (ECRYPTFS_POLICY_APPLIED
211 | ECRYPTFS_ENCRYPTED);
212 }
213 mutex_unlock(&crypt_stat->cs_mutex);
214 rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
215 if (rc) {
216 printk(KERN_ERR "%s: Error attempting to initialize "
217 "the lower file for the dentry with name "
218 "[%s]; rc = [%d]\n", __func__,
219 ecryptfs_dentry->d_name.name, rc);
220 goto out_free;
221 }
222 if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
223 == O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
224 rc = -EPERM;
225 printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
226 "file must hence be opened RO\n", __func__);
227 goto out_put;
228 }
229 ecryptfs_set_file_lower(
230 file, ecryptfs_inode_to_private(inode)->lower_file);
231 if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
232 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
233 mutex_lock(&crypt_stat->cs_mutex);
234 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
235 mutex_unlock(&crypt_stat->cs_mutex);
236 rc = 0;
237 goto out;
238 }
239 mutex_lock(&crypt_stat->cs_mutex);
240 if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
241 || !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
242 rc = ecryptfs_read_metadata(ecryptfs_dentry);
243 if (rc) {
244 ecryptfs_printk(KERN_DEBUG,
245 "Valid headers not found\n");
246 if (!(mount_crypt_stat->flags
247 & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
248 rc = -EIO;
249 printk(KERN_WARNING "Either the lower file "
250 "is not in a valid eCryptfs format, "
251 "or the key could not be retrieved. "
252 "Plaintext passthrough mode is not "
253 "enabled; returning -EIO\n");
254 mutex_unlock(&crypt_stat->cs_mutex);
255 goto out_put;
256 }
257 rc = 0;
258 crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
259 | ECRYPTFS_ENCRYPTED);
260 mutex_unlock(&crypt_stat->cs_mutex);
261 goto out;
262 }
263 }
264 mutex_unlock(&crypt_stat->cs_mutex);
265 ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
266 "[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
267 (unsigned long long)i_size_read(inode));
268 goto out;
269out_put:
270 ecryptfs_put_lower_file(inode);
271out_free:
272 kmem_cache_free(ecryptfs_file_info_cache,
273 ecryptfs_file_to_private(file));
274out:
275 return rc;
276}
277
278static int ecryptfs_flush(struct file *file, fl_owner_t td)
279{
280 return file->f_mode & FMODE_WRITE
281 ? filemap_write_and_wait(file->f_mapping) : 0;
282}
283
284static int ecryptfs_release(struct inode *inode, struct file *file)
285{
286 ecryptfs_put_lower_file(inode);
287 kmem_cache_free(ecryptfs_file_info_cache,
288 ecryptfs_file_to_private(file));
289 return 0;
290}
291
292static int
293ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
294{
295 int rc = 0;
296
297 rc = generic_file_fsync(file, start, end, datasync);
298 if (rc)
299 goto out;
300 rc = vfs_fsync_range(ecryptfs_file_to_lower(file), start, end,
301 datasync);
302out:
303 return rc;
304}
305
306static int ecryptfs_fasync(int fd, struct file *file, int flag)
307{
308 int rc = 0;
309 struct file *lower_file = NULL;
310
311 lower_file = ecryptfs_file_to_lower(file);
312 if (lower_file->f_op && lower_file->f_op->fasync)
313 rc = lower_file->f_op->fasync(fd, lower_file, flag);
314 return rc;
315}
316
317static long
318ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
319{
320 struct file *lower_file = NULL;
321 long rc = -ENOTTY;
322
323 if (ecryptfs_file_to_private(file))
324 lower_file = ecryptfs_file_to_lower(file);
325 if (lower_file && lower_file->f_op && lower_file->f_op->unlocked_ioctl)
326 rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
327 return rc;
328}
329
330#ifdef CONFIG_COMPAT
331static long
332ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
333{
334 struct file *lower_file = NULL;
335 long rc = -ENOIOCTLCMD;
336
337 if (ecryptfs_file_to_private(file))
338 lower_file = ecryptfs_file_to_lower(file);
339 if (lower_file && lower_file->f_op && lower_file->f_op->compat_ioctl)
340 rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
341 return rc;
342}
343#endif
344
345const struct file_operations ecryptfs_dir_fops = {
346 .readdir = ecryptfs_readdir,
347 .read = generic_read_dir,
348 .unlocked_ioctl = ecryptfs_unlocked_ioctl,
349#ifdef CONFIG_COMPAT
350 .compat_ioctl = ecryptfs_compat_ioctl,
351#endif
352 .open = ecryptfs_open,
353 .flush = ecryptfs_flush,
354 .release = ecryptfs_release,
355 .fsync = ecryptfs_fsync,
356 .fasync = ecryptfs_fasync,
357 .splice_read = generic_file_splice_read,
358 .llseek = default_llseek,
359};
360
361const struct file_operations ecryptfs_main_fops = {
362 .llseek = generic_file_llseek,
363 .read = do_sync_read,
364 .aio_read = ecryptfs_read_update_atime,
365 .write = do_sync_write,
366 .aio_write = generic_file_aio_write,
367 .readdir = ecryptfs_readdir,
368 .unlocked_ioctl = ecryptfs_unlocked_ioctl,
369#ifdef CONFIG_COMPAT
370 .compat_ioctl = ecryptfs_compat_ioctl,
371#endif
372 .mmap = ecryptfs_file_mmap,
373 .open = ecryptfs_open,
374 .flush = ecryptfs_flush,
375 .release = ecryptfs_release,
376 .fsync = ecryptfs_fsync,
377 .fasync = ecryptfs_fasync,
378 .splice_read = generic_file_splice_read,
379};