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