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7#include <linux/kernel.h>
8#include <linux/uuid.h>
9#include <linux/fs.h>
10#include "ovl_entry.h"
11
12#undef pr_fmt
13#define pr_fmt(fmt) "overlayfs: " fmt
14
15enum ovl_path_type {
16 __OVL_PATH_UPPER = (1 << 0),
17 __OVL_PATH_MERGE = (1 << 1),
18 __OVL_PATH_ORIGIN = (1 << 2),
19};
20
21#define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER)
22#define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE)
23#define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN)
24
25#define OVL_XATTR_NAMESPACE "overlay."
26#define OVL_XATTR_TRUSTED_PREFIX XATTR_TRUSTED_PREFIX OVL_XATTR_NAMESPACE
27#define OVL_XATTR_USER_PREFIX XATTR_USER_PREFIX OVL_XATTR_NAMESPACE
28
29enum ovl_xattr {
30 OVL_XATTR_OPAQUE,
31 OVL_XATTR_REDIRECT,
32 OVL_XATTR_ORIGIN,
33 OVL_XATTR_IMPURE,
34 OVL_XATTR_NLINK,
35 OVL_XATTR_UPPER,
36 OVL_XATTR_METACOPY,
37 OVL_XATTR_PROTATTR,
38};
39
40enum ovl_inode_flag {
41
42 OVL_IMPURE,
43
44 OVL_WHITEOUTS,
45 OVL_INDEX,
46 OVL_UPPERDATA,
47
48 OVL_CONST_INO,
49};
50
51enum ovl_entry_flag {
52 OVL_E_UPPER_ALIAS,
53 OVL_E_OPAQUE,
54 OVL_E_CONNECTED,
55};
56
57enum {
58 OVL_XINO_OFF,
59 OVL_XINO_AUTO,
60 OVL_XINO_ON,
61};
62
63
64
65
66
67
68
69#define OVL_FH_VERSION 0
70#define OVL_FH_MAGIC 0xfb
71
72
73#define OVL_FH_FLAG_BIG_ENDIAN (1 << 0)
74#define OVL_FH_FLAG_ANY_ENDIAN (1 << 1)
75
76#define OVL_FH_FLAG_PATH_UPPER (1 << 2)
77
78#define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \
79 OVL_FH_FLAG_PATH_UPPER)
80
81#if defined(__LITTLE_ENDIAN)
82#define OVL_FH_FLAG_CPU_ENDIAN 0
83#elif defined(__BIG_ENDIAN)
84#define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN
85#else
86#error Endianness not defined
87#endif
88
89
90#define OVL_FILEID_V0 0xfb
91
92#define OVL_FILEID_V1 0xf8
93
94
95struct ovl_fb {
96 u8 version;
97 u8 magic;
98 u8 len;
99 u8 flags;
100 u8 type;
101 uuid_t uuid;
102 u32 fid[];
103} __packed;
104
105
106struct ovl_fh {
107 u8 padding[3];
108 union {
109 struct ovl_fb fb;
110 u8 buf[0];
111 };
112} __packed;
113
114#define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb)
115#define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len)
116#define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \
117 offsetof(struct ovl_fb, fid))
118
119extern const char *const ovl_xattr_table[][2];
120static inline const char *ovl_xattr(struct ovl_fs *ofs, enum ovl_xattr ox)
121{
122 return ovl_xattr_table[ox][ofs->config.userxattr];
123}
124
125static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
126{
127 int err = vfs_rmdir(&init_user_ns, dir, dentry);
128
129 pr_debug("rmdir(%pd2) = %i\n", dentry, err);
130 return err;
131}
132
133static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry)
134{
135 int err = vfs_unlink(&init_user_ns, dir, dentry, NULL);
136
137 pr_debug("unlink(%pd2) = %i\n", dentry, err);
138 return err;
139}
140
141static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir,
142 struct dentry *new_dentry)
143{
144 int err = vfs_link(old_dentry, &init_user_ns, dir, new_dentry, NULL);
145
146 pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err);
147 return err;
148}
149
150static inline int ovl_do_create(struct inode *dir, struct dentry *dentry,
151 umode_t mode)
152{
153 int err = vfs_create(&init_user_ns, dir, dentry, mode, true);
154
155 pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
156 return err;
157}
158
159static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry,
160 umode_t mode)
161{
162 int err = vfs_mkdir(&init_user_ns, dir, dentry, mode);
163 pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
164 return err;
165}
166
167static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry,
168 umode_t mode, dev_t dev)
169{
170 int err = vfs_mknod(&init_user_ns, dir, dentry, mode, dev);
171
172 pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err);
173 return err;
174}
175
176static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry,
177 const char *oldname)
178{
179 int err = vfs_symlink(&init_user_ns, dir, dentry, oldname);
180
181 pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
182 return err;
183}
184
185static inline ssize_t ovl_do_getxattr(struct ovl_fs *ofs, struct dentry *dentry,
186 enum ovl_xattr ox, void *value,
187 size_t size)
188{
189 const char *name = ovl_xattr(ofs, ox);
190 int err = vfs_getxattr(&init_user_ns, dentry, name, value, size);
191 int len = (value && err > 0) ? err : 0;
192
193 pr_debug("getxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n",
194 dentry, name, min(len, 48), value, size, err);
195 return err;
196}
197
198static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry,
199 enum ovl_xattr ox, const void *value,
200 size_t size)
201{
202 const char *name = ovl_xattr(ofs, ox);
203 int err = vfs_setxattr(&init_user_ns, dentry, name, value, size, 0);
204 pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n",
205 dentry, name, min((int)size, 48), value, size, err);
206 return err;
207}
208
209static inline int ovl_do_removexattr(struct ovl_fs *ofs, struct dentry *dentry,
210 enum ovl_xattr ox)
211{
212 const char *name = ovl_xattr(ofs, ox);
213 int err = vfs_removexattr(&init_user_ns, dentry, name);
214 pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
215 return err;
216}
217
218static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry,
219 struct inode *newdir, struct dentry *newdentry,
220 unsigned int flags)
221{
222 int err;
223 struct renamedata rd = {
224 .old_mnt_userns = &init_user_ns,
225 .old_dir = olddir,
226 .old_dentry = olddentry,
227 .new_mnt_userns = &init_user_ns,
228 .new_dir = newdir,
229 .new_dentry = newdentry,
230 .flags = flags,
231 };
232
233 pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags);
234 err = vfs_rename(&rd);
235 if (err) {
236 pr_debug("...rename(%pd2, %pd2, ...) = %i\n",
237 olddentry, newdentry, err);
238 }
239 return err;
240}
241
242static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
243{
244 int err = vfs_whiteout(&init_user_ns, dir, dentry);
245 pr_debug("whiteout(%pd2) = %i\n", dentry, err);
246 return err;
247}
248
249static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode)
250{
251 struct dentry *ret = vfs_tmpfile(&init_user_ns, dentry, mode, 0);
252 int err = PTR_ERR_OR_ZERO(ret);
253
254 pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err);
255 return ret;
256}
257
258static inline bool ovl_open_flags_need_copy_up(int flags)
259{
260 if (!flags)
261 return false;
262
263 return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC));
264}
265
266static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs)
267{
268
269
270
271
272
273 return (!ofs->config.index && !ofs->config.metacopy &&
274 !ofs->config.redirect_dir && ofs->config.xino != OVL_XINO_ON);
275}
276
277
278
279int ovl_want_write(struct dentry *dentry);
280void ovl_drop_write(struct dentry *dentry);
281struct dentry *ovl_workdir(struct dentry *dentry);
282const struct cred *ovl_override_creds(struct super_block *sb);
283int ovl_can_decode_fh(struct super_block *sb);
284struct dentry *ovl_indexdir(struct super_block *sb);
285bool ovl_index_all(struct super_block *sb);
286bool ovl_verify_lower(struct super_block *sb);
287struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
288bool ovl_dentry_remote(struct dentry *dentry);
289void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry,
290 unsigned int mask);
291bool ovl_dentry_weird(struct dentry *dentry);
292enum ovl_path_type ovl_path_type(struct dentry *dentry);
293void ovl_path_upper(struct dentry *dentry, struct path *path);
294void ovl_path_lower(struct dentry *dentry, struct path *path);
295void ovl_path_lowerdata(struct dentry *dentry, struct path *path);
296enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
297struct dentry *ovl_dentry_upper(struct dentry *dentry);
298struct dentry *ovl_dentry_lower(struct dentry *dentry);
299struct dentry *ovl_dentry_lowerdata(struct dentry *dentry);
300const struct ovl_layer *ovl_layer_lower(struct dentry *dentry);
301struct dentry *ovl_dentry_real(struct dentry *dentry);
302struct dentry *ovl_i_dentry_upper(struct inode *inode);
303struct inode *ovl_inode_upper(struct inode *inode);
304struct inode *ovl_inode_lower(struct inode *inode);
305struct inode *ovl_inode_lowerdata(struct inode *inode);
306struct inode *ovl_inode_real(struct inode *inode);
307struct inode *ovl_inode_realdata(struct inode *inode);
308struct ovl_dir_cache *ovl_dir_cache(struct inode *inode);
309void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache);
310void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry);
311void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry);
312bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry);
313bool ovl_dentry_is_opaque(struct dentry *dentry);
314bool ovl_dentry_is_whiteout(struct dentry *dentry);
315void ovl_dentry_set_opaque(struct dentry *dentry);
316bool ovl_dentry_has_upper_alias(struct dentry *dentry);
317void ovl_dentry_set_upper_alias(struct dentry *dentry);
318bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags);
319bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags);
320bool ovl_has_upperdata(struct inode *inode);
321void ovl_set_upperdata(struct inode *inode);
322bool ovl_redirect_dir(struct super_block *sb);
323const char *ovl_dentry_get_redirect(struct dentry *dentry);
324void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect);
325void ovl_inode_update(struct inode *inode, struct dentry *upperdentry);
326void ovl_dir_modified(struct dentry *dentry, bool impurity);
327u64 ovl_dentry_version_get(struct dentry *dentry);
328bool ovl_is_whiteout(struct dentry *dentry);
329struct file *ovl_path_open(struct path *path, int flags);
330int ovl_copy_up_start(struct dentry *dentry, int flags);
331void ovl_copy_up_end(struct dentry *dentry);
332bool ovl_already_copied_up(struct dentry *dentry, int flags);
333bool ovl_check_origin_xattr(struct ovl_fs *ofs, struct dentry *dentry);
334bool ovl_check_dir_xattr(struct super_block *sb, struct dentry *dentry,
335 enum ovl_xattr ox);
336int ovl_check_setxattr(struct ovl_fs *ofs, struct dentry *upperdentry,
337 enum ovl_xattr ox, const void *value, size_t size,
338 int xerr);
339int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry);
340bool ovl_inuse_trylock(struct dentry *dentry);
341void ovl_inuse_unlock(struct dentry *dentry);
342bool ovl_is_inuse(struct dentry *dentry);
343bool ovl_need_index(struct dentry *dentry);
344int ovl_nlink_start(struct dentry *dentry);
345void ovl_nlink_end(struct dentry *dentry);
346int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir);
347int ovl_check_metacopy_xattr(struct ovl_fs *ofs, struct dentry *dentry);
348bool ovl_is_metacopy_dentry(struct dentry *dentry);
349char *ovl_get_redirect_xattr(struct ovl_fs *ofs, struct dentry *dentry,
350 int padding);
351int ovl_sync_status(struct ovl_fs *ofs);
352
353static inline void ovl_set_flag(unsigned long flag, struct inode *inode)
354{
355 set_bit(flag, &OVL_I(inode)->flags);
356}
357
358static inline void ovl_clear_flag(unsigned long flag, struct inode *inode)
359{
360 clear_bit(flag, &OVL_I(inode)->flags);
361}
362
363static inline bool ovl_test_flag(unsigned long flag, struct inode *inode)
364{
365 return test_bit(flag, &OVL_I(inode)->flags);
366}
367
368static inline bool ovl_is_impuredir(struct super_block *sb,
369 struct dentry *dentry)
370{
371 return ovl_check_dir_xattr(sb, dentry, OVL_XATTR_IMPURE);
372}
373
374
375
376
377
378
379static inline bool ovl_xino_warn(struct super_block *sb)
380{
381 return OVL_FS(sb)->config.xino == OVL_XINO_ON;
382}
383
384
385static inline bool ovl_same_fs(struct super_block *sb)
386{
387 return OVL_FS(sb)->xino_mode == 0;
388}
389
390
391static inline bool ovl_same_dev(struct super_block *sb)
392{
393 return OVL_FS(sb)->xino_mode >= 0;
394}
395
396static inline unsigned int ovl_xino_bits(struct super_block *sb)
397{
398 return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0;
399}
400
401static inline void ovl_inode_lock(struct inode *inode)
402{
403 mutex_lock(&OVL_I(inode)->lock);
404}
405
406static inline int ovl_inode_lock_interruptible(struct inode *inode)
407{
408 return mutex_lock_interruptible(&OVL_I(inode)->lock);
409}
410
411static inline void ovl_inode_unlock(struct inode *inode)
412{
413 mutex_unlock(&OVL_I(inode)->lock);
414}
415
416
417
418int ovl_check_fb_len(struct ovl_fb *fb, int fb_len);
419
420static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len)
421{
422 if (fh_len < sizeof(struct ovl_fh))
423 return -EINVAL;
424
425 return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET);
426}
427
428struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh,
429 struct vfsmount *mnt, bool connected);
430int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected,
431 struct dentry *upperdentry, struct ovl_path **stackp);
432int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry,
433 enum ovl_xattr ox, struct dentry *real, bool is_upper,
434 bool set);
435struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index);
436int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index);
437int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin,
438 struct qstr *name);
439struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh);
440struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
441 struct dentry *origin, bool verify);
442int ovl_path_next(int idx, struct dentry *dentry, struct path *path);
443struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
444 unsigned int flags);
445bool ovl_lower_positive(struct dentry *dentry);
446
447static inline int ovl_verify_origin(struct ovl_fs *ofs, struct dentry *upper,
448 struct dentry *origin, bool set)
449{
450 return ovl_verify_set_fh(ofs, upper, OVL_XATTR_ORIGIN, origin,
451 false, set);
452}
453
454static inline int ovl_verify_upper(struct ovl_fs *ofs, struct dentry *index,
455 struct dentry *upper, bool set)
456{
457 return ovl_verify_set_fh(ofs, index, OVL_XATTR_UPPER, upper, true, set);
458}
459
460
461extern const struct file_operations ovl_dir_operations;
462struct file *ovl_dir_real_file(const struct file *file, bool want_upper);
463int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
464void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list);
465void ovl_cache_free(struct list_head *list);
466void ovl_dir_cache_free(struct inode *inode);
467int ovl_check_d_type_supported(struct path *realpath);
468int ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt,
469 struct dentry *dentry, int level);
470int ovl_indexdir_cleanup(struct ovl_fs *ofs);
471
472
473
474
475
476
477
478
479static inline bool ovl_dir_is_real(struct dentry *dir)
480{
481 return !ovl_test_flag(OVL_WHITEOUTS, d_inode(dir));
482}
483
484
485int ovl_set_nlink_upper(struct dentry *dentry);
486int ovl_set_nlink_lower(struct dentry *dentry);
487unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry,
488 struct dentry *upperdentry,
489 unsigned int fallback);
490int ovl_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
491 struct iattr *attr);
492int ovl_getattr(struct user_namespace *mnt_userns, const struct path *path,
493 struct kstat *stat, u32 request_mask, unsigned int flags);
494int ovl_permission(struct user_namespace *mnt_userns, struct inode *inode,
495 int mask);
496int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
497 const void *value, size_t size, int flags);
498int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name,
499 void *value, size_t size);
500ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
501struct posix_acl *ovl_get_acl(struct inode *inode, int type, bool rcu);
502int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags);
503bool ovl_is_private_xattr(struct super_block *sb, const char *name);
504
505struct ovl_inode_params {
506 struct inode *newinode;
507 struct dentry *upperdentry;
508 struct ovl_path *lowerpath;
509 bool index;
510 unsigned int numlower;
511 char *redirect;
512 struct dentry *lowerdata;
513};
514void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip,
515 unsigned long ino, int fsid);
516struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev);
517struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real,
518 bool is_upper);
519bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir);
520struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir);
521struct inode *ovl_get_inode(struct super_block *sb,
522 struct ovl_inode_params *oip);
523static inline void ovl_copyattr(struct inode *from, struct inode *to)
524{
525 to->i_uid = from->i_uid;
526 to->i_gid = from->i_gid;
527 to->i_mode = from->i_mode;
528 to->i_atime = from->i_atime;
529 to->i_mtime = from->i_mtime;
530 to->i_ctime = from->i_ctime;
531 i_size_write(to, i_size_read(from));
532}
533
534
535#define OVL_COPY_I_FLAGS_MASK (S_SYNC | S_NOATIME | S_APPEND | S_IMMUTABLE)
536
537#define OVL_PROT_I_FLAGS_MASK (S_APPEND | S_IMMUTABLE)
538
539
540
541
542
543
544#define OVL_COPY_FS_FLAGS_MASK (FS_SYNC_FL | FS_NOATIME_FL)
545#define OVL_COPY_FSX_FLAGS_MASK (FS_XFLAG_SYNC | FS_XFLAG_NOATIME)
546#define OVL_PROT_FS_FLAGS_MASK (FS_APPEND_FL | FS_IMMUTABLE_FL)
547#define OVL_PROT_FSX_FLAGS_MASK (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE)
548
549void ovl_check_protattr(struct inode *inode, struct dentry *upper);
550int ovl_set_protattr(struct inode *inode, struct dentry *upper,
551 struct fileattr *fa);
552
553static inline void ovl_copyflags(struct inode *from, struct inode *to)
554{
555 unsigned int mask = OVL_COPY_I_FLAGS_MASK;
556
557 inode_set_flags(to, from->i_flags & mask, mask);
558}
559
560
561extern const struct inode_operations ovl_dir_inode_operations;
562int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir,
563 struct dentry *dentry);
564struct ovl_cattr {
565 dev_t rdev;
566 umode_t mode;
567 const char *link;
568 struct dentry *hardlink;
569};
570
571#define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) })
572
573struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry,
574 struct ovl_cattr *attr);
575int ovl_cleanup(struct inode *dir, struct dentry *dentry);
576struct dentry *ovl_lookup_temp(struct dentry *workdir);
577struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr);
578
579
580extern const struct file_operations ovl_file_operations;
581int __init ovl_aio_request_cache_init(void);
582void ovl_aio_request_cache_destroy(void);
583int ovl_real_fileattr_get(struct path *realpath, struct fileattr *fa);
584int ovl_real_fileattr_set(struct path *realpath, struct fileattr *fa);
585int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa);
586int ovl_fileattr_set(struct user_namespace *mnt_userns,
587 struct dentry *dentry, struct fileattr *fa);
588
589
590int ovl_copy_up(struct dentry *dentry);
591int ovl_copy_up_with_data(struct dentry *dentry);
592int ovl_maybe_copy_up(struct dentry *dentry, int flags);
593int ovl_copy_xattr(struct super_block *sb, struct dentry *old,
594 struct dentry *new);
595int ovl_set_attr(struct dentry *upper, struct kstat *stat);
596struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real,
597 bool is_upper);
598int ovl_set_origin(struct ovl_fs *ofs, struct dentry *lower,
599 struct dentry *upper);
600
601
602extern const struct export_operations ovl_export_operations;
603