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Miklos Szeredie9be9d52014-10-24 00:14:38 +02001/*
2 *
3 * Copyright (C) 2011 Novell Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 */
9
10#include <linux/kernel.h>
Amir Goldstein3a1e8192017-03-30 15:22:16 +030011#include <linux/uuid.h>
Amir Goldsteinee023c32017-10-30 13:33:11 +020012#include "ovl_entry.h"
Miklos Szeredie9be9d52014-10-24 00:14:38 +020013
Miklos Szeredie9be9d52014-10-24 00:14:38 +020014enum ovl_path_type {
Miklos Szeredi38e813d2016-12-16 11:02:55 +010015 __OVL_PATH_UPPER = (1 << 0),
16 __OVL_PATH_MERGE = (1 << 1),
Amir Goldstein59548502017-04-23 23:12:34 +030017 __OVL_PATH_ORIGIN = (1 << 2),
Miklos Szeredie9be9d52014-10-24 00:14:38 +020018};
19
Miklos Szeredi1afaba12014-12-13 00:59:42 +010020#define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER)
21#define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE)
Amir Goldstein59548502017-04-23 23:12:34 +030022#define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN)
Miklos Szeredid837a492016-07-29 12:05:24 +020023
Andreas Gruenbacherfe2b7592016-08-22 17:59:22 +020024#define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay."
25#define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque"
Miklos Szeredi02b69b22016-12-16 11:02:56 +010026#define OVL_XATTR_REDIRECT OVL_XATTR_PREFIX "redirect"
Amir Goldstein3a1e8192017-03-30 15:22:16 +030027#define OVL_XATTR_ORIGIN OVL_XATTR_PREFIX "origin"
Amir Goldsteinee1d6d372017-05-11 16:42:26 +030028#define OVL_XATTR_IMPURE OVL_XATTR_PREFIX "impure"
Amir Goldstein5f8415d2017-06-20 15:35:14 +030029#define OVL_XATTR_NLINK OVL_XATTR_PREFIX "nlink"
Amir Goldsteinad1d6152018-01-11 10:47:03 +020030#define OVL_XATTR_UPPER OVL_XATTR_PREFIX "upper"
Amir Goldstein3a1e8192017-03-30 15:22:16 +030031
Amir Goldsteinc62520a2018-01-14 19:25:31 +020032enum ovl_inode_flag {
Amir Goldsteinb79e05a2017-06-25 16:37:17 +030033 /* Pure upper dir that may contain non pure upper entries */
Miklos Szeredi13c72072017-07-04 22:03:16 +020034 OVL_IMPURE,
Amir Goldsteinb79e05a2017-06-25 16:37:17 +030035 /* Non-merge dir that may contain whiteout entries */
36 OVL_WHITEOUTS,
Amir Goldstein359f3922017-06-21 15:28:41 +030037 OVL_INDEX,
Miklos Szeredi13c72072017-07-04 22:03:16 +020038};
39
Amir Goldsteinc62520a2018-01-14 19:25:31 +020040enum ovl_entry_flag {
41 OVL_E_UPPER_ALIAS,
42 OVL_E_OPAQUE,
Amir Goldstein2ca3c142018-01-30 13:31:09 +020043 OVL_E_CONNECTED,
Amir Goldsteinc62520a2018-01-14 19:25:31 +020044};
45
Amir Goldstein3a1e8192017-03-30 15:22:16 +030046/*
47 * The tuple (fh,uuid) is a universal unique identifier for a copy up origin,
48 * where:
49 * origin.fh - exported file handle of the lower file
50 * origin.uuid - uuid of the lower filesystem
51 */
52#define OVL_FH_VERSION 0
53#define OVL_FH_MAGIC 0xfb
54
55/* CPU byte order required for fid decoding: */
56#define OVL_FH_FLAG_BIG_ENDIAN (1 << 0)
57#define OVL_FH_FLAG_ANY_ENDIAN (1 << 1)
Amir Goldstein54fb3472017-06-21 15:28:38 +030058/* Is the real inode encoded in fid an upper inode? */
59#define OVL_FH_FLAG_PATH_UPPER (1 << 2)
Amir Goldstein3a1e8192017-03-30 15:22:16 +030060
Amir Goldstein961af642017-07-11 15:58:36 +030061#define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \
62 OVL_FH_FLAG_PATH_UPPER)
Amir Goldstein3a1e8192017-03-30 15:22:16 +030063
64#if defined(__LITTLE_ENDIAN)
65#define OVL_FH_FLAG_CPU_ENDIAN 0
66#elif defined(__BIG_ENDIAN)
67#define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN
68#else
69#error Endianness not defined
70#endif
71
Amir Goldstein8ed5eec2017-07-12 14:17:16 +030072/* The type returned by overlay exportfs ops when encoding an ovl_fh handle */
73#define OVL_FILEID 0xfb
74
Amir Goldstein3a1e8192017-03-30 15:22:16 +030075/* On-disk and in-memeory format for redirect by file handle */
76struct ovl_fh {
77 u8 version; /* 0 */
78 u8 magic; /* 0xfb */
79 u8 len; /* size of this header + size of fid */
80 u8 flags; /* OVL_FH_FLAG_* */
81 u8 type; /* fid_type of fid */
Christoph Hellwig01633fd2017-05-17 09:32:50 +020082 uuid_t uuid; /* uuid of filesystem */
Amir Goldstein3a1e8192017-03-30 15:22:16 +030083 u8 fid[0]; /* file identifier */
84} __packed;
Miklos Szeredie9be9d52014-10-24 00:14:38 +020085
86static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
87{
88 int err = vfs_rmdir(dir, dentry);
89 pr_debug("rmdir(%pd2) = %i\n", dentry, err);
90 return err;
91}
92
93static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry)
94{
95 int err = vfs_unlink(dir, dentry, NULL);
96 pr_debug("unlink(%pd2) = %i\n", dentry, err);
97 return err;
98}
99
100static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir,
101 struct dentry *new_dentry, bool debug)
102{
103 int err = vfs_link(old_dentry, dir, new_dentry, NULL);
104 if (debug) {
105 pr_debug("link(%pd2, %pd2) = %i\n",
106 old_dentry, new_dentry, err);
107 }
108 return err;
109}
110
111static inline int ovl_do_create(struct inode *dir, struct dentry *dentry,
112 umode_t mode, bool debug)
113{
114 int err = vfs_create(dir, dentry, mode, true);
115 if (debug)
116 pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
117 return err;
118}
119
120static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry,
121 umode_t mode, bool debug)
122{
123 int err = vfs_mkdir(dir, dentry, mode);
124 if (debug)
125 pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
126 return err;
127}
128
129static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry,
130 umode_t mode, dev_t dev, bool debug)
131{
132 int err = vfs_mknod(dir, dentry, mode, dev);
133 if (debug) {
134 pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n",
135 dentry, mode, dev, err);
136 }
137 return err;
138}
139
140static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry,
141 const char *oldname, bool debug)
142{
143 int err = vfs_symlink(dir, dentry, oldname);
144 if (debug)
145 pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
146 return err;
147}
148
149static inline int ovl_do_setxattr(struct dentry *dentry, const char *name,
150 const void *value, size_t size, int flags)
151{
152 int err = vfs_setxattr(dentry, name, value, size, flags);
153 pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n",
154 dentry, name, (int) size, (char *) value, flags, err);
155 return err;
156}
157
158static inline int ovl_do_removexattr(struct dentry *dentry, const char *name)
159{
160 int err = vfs_removexattr(dentry, name);
161 pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
162 return err;
163}
164
165static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry,
166 struct inode *newdir, struct dentry *newdentry,
167 unsigned int flags)
168{
169 int err;
170
Miklos Szeredi2773bf02016-09-27 11:03:58 +0200171 pr_debug("rename(%pd2, %pd2, 0x%x)\n",
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200172 olddentry, newdentry, flags);
173
174 err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);
175
176 if (err) {
Miklos Szeredi2773bf02016-09-27 11:03:58 +0200177 pr_debug("...rename(%pd2, %pd2, ...) = %i\n",
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200178 olddentry, newdentry, err);
179 }
180 return err;
181}
182
183static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
184{
185 int err = vfs_whiteout(dir, dentry);
186 pr_debug("whiteout(%pd2) = %i\n", dentry, err);
187 return err;
188}
189
Amir Goldsteine7f52422017-01-17 06:34:53 +0200190static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode)
191{
192 struct dentry *ret = vfs_tmpfile(dentry, mode, 0);
Vasyl Gomonovych7879cb42017-11-28 00:09:23 +0100193 int err = PTR_ERR_OR_ZERO(ret);
Amir Goldsteine7f52422017-01-17 06:34:53 +0200194
195 pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err);
196 return ret;
197}
198
Miklos Szeredibbb1e542016-12-16 11:02:56 +0100199/* util.c */
200int ovl_want_write(struct dentry *dentry);
201void ovl_drop_write(struct dentry *dentry);
202struct dentry *ovl_workdir(struct dentry *dentry);
203const struct cred *ovl_override_creds(struct super_block *sb);
Amir Goldstein7bcd74b2017-03-22 08:42:21 -0400204struct super_block *ovl_same_sb(struct super_block *sb);
Amir Goldstein02bcd152017-06-21 15:28:36 +0300205bool ovl_can_decode_fh(struct super_block *sb);
206struct dentry *ovl_indexdir(struct super_block *sb);
Amir Goldsteinf168f102018-01-19 11:26:53 +0200207bool ovl_index_all(struct super_block *sb);
208bool ovl_verify_lower(struct super_block *sb);
Miklos Szeredibbb1e542016-12-16 11:02:56 +0100209struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
210bool ovl_dentry_remote(struct dentry *dentry);
211bool ovl_dentry_weird(struct dentry *dentry);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200212enum ovl_path_type ovl_path_type(struct dentry *dentry);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200213void ovl_path_upper(struct dentry *dentry, struct path *path);
214void ovl_path_lower(struct dentry *dentry, struct path *path);
215enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200216struct dentry *ovl_dentry_upper(struct dentry *dentry);
217struct dentry *ovl_dentry_lower(struct dentry *dentry);
Amir Goldsteinda309e82017-11-08 19:39:51 +0200218struct ovl_layer *ovl_layer_lower(struct dentry *dentry);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200219struct dentry *ovl_dentry_real(struct dentry *dentry);
Miklos Szeredi1d88f182017-07-20 11:08:21 +0200220struct dentry *ovl_i_dentry_upper(struct inode *inode);
Miklos Szeredi09d8b582017-07-04 22:03:16 +0200221struct inode *ovl_inode_upper(struct inode *inode);
222struct inode *ovl_inode_lower(struct inode *inode);
223struct inode *ovl_inode_real(struct inode *inode);
Miklos Szeredi4edb83b2017-07-27 21:54:06 +0200224struct ovl_dir_cache *ovl_dir_cache(struct inode *inode);
225void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache);
Amir Goldsteinc62520a2018-01-14 19:25:31 +0200226void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry);
227void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry);
228bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200229bool ovl_dentry_is_opaque(struct dentry *dentry);
Miklos Szeredic412ce42016-12-16 11:02:55 +0100230bool ovl_dentry_is_whiteout(struct dentry *dentry);
Miklos Szeredi5cf5b472016-12-16 11:02:57 +0100231void ovl_dentry_set_opaque(struct dentry *dentry);
Miklos Szeredi55acc662017-07-04 22:03:18 +0200232bool ovl_dentry_has_upper_alias(struct dentry *dentry);
233void ovl_dentry_set_upper_alias(struct dentry *dentry);
Miklos Szeredia6c60652016-12-16 11:02:56 +0100234bool ovl_redirect_dir(struct super_block *sb);
Miklos Szeredia6c60652016-12-16 11:02:56 +0100235const char *ovl_dentry_get_redirect(struct dentry *dentry);
236void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect);
Miklos Szeredi09d8b582017-07-04 22:03:16 +0200237void ovl_inode_init(struct inode *inode, struct dentry *upperdentry,
238 struct dentry *lowerdentry);
239void ovl_inode_update(struct inode *inode, struct dentry *upperdentry);
Miklos Szeredi4edb83b2017-07-27 21:54:06 +0200240void ovl_dentry_version_inc(struct dentry *dentry, bool impurity);
Miklos Szeredibbb1e542016-12-16 11:02:56 +0100241u64 ovl_dentry_version_get(struct dentry *dentry);
242bool ovl_is_whiteout(struct dentry *dentry);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200243struct file *ovl_path_open(struct path *path, int flags);
Amir Goldstein39d3d602017-01-17 06:34:56 +0200244int ovl_copy_up_start(struct dentry *dentry);
245void ovl_copy_up_end(struct dentry *dentry);
Amir Goldsteinb79e05a2017-06-25 16:37:17 +0300246bool ovl_check_origin_xattr(struct dentry *dentry);
Amir Goldsteinf3a15682017-05-24 15:29:33 +0300247bool ovl_check_dir_xattr(struct dentry *dentry, const char *name);
248int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry,
249 const char *name, const void *value, size_t size,
250 int xerr);
251int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry);
Miklos Szeredi13c72072017-07-04 22:03:16 +0200252void ovl_set_flag(unsigned long flag, struct inode *inode);
Miklos Szeredi4edb83b2017-07-27 21:54:06 +0200253void ovl_clear_flag(unsigned long flag, struct inode *inode);
Miklos Szeredi13c72072017-07-04 22:03:16 +0200254bool ovl_test_flag(unsigned long flag, struct inode *inode);
Amir Goldsteinad0af712017-06-21 15:28:32 +0300255bool ovl_inuse_trylock(struct dentry *dentry);
256void ovl_inuse_unlock(struct dentry *dentry);
Amir Goldstein24b33ee2017-09-26 07:55:26 +0300257bool ovl_need_index(struct dentry *dentry);
Amir Goldstein5f8415d2017-06-20 15:35:14 +0300258int ovl_nlink_start(struct dentry *dentry, bool *locked);
259void ovl_nlink_end(struct dentry *dentry, bool locked);
Amir Goldstein5820dc02017-09-25 16:39:55 +0300260int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir);
Amir Goldsteinf3a15682017-05-24 15:29:33 +0300261
262static inline bool ovl_is_impuredir(struct dentry *dentry)
263{
264 return ovl_check_dir_xattr(dentry, OVL_XATTR_IMPURE);
265}
266
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200267
Miklos Szeredibbb1e542016-12-16 11:02:56 +0100268/* namei.c */
Amir Goldstein8556a422018-01-19 01:03:23 +0200269int ovl_check_fh_len(struct ovl_fh *fh, int fh_len);
Amir Goldstein8a22efa2018-03-09 15:51:02 +0200270struct dentry *ovl_decode_real_fh(struct ovl_fh *fh, struct vfsmount *mnt,
271 bool connected);
272int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected,
Amir Goldsteinf9418662018-01-19 21:33:44 +0200273 struct dentry *upperdentry, struct ovl_path **stackp);
Amir Goldstein05122442018-01-11 08:25:32 +0200274int ovl_verify_set_fh(struct dentry *dentry, const char *name,
275 struct dentry *real, bool is_upper, bool set);
Amir Goldstein3b0bfc62017-12-24 18:42:16 +0200276struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index);
Amir Goldstein1eff1a12017-12-12 22:40:46 +0200277int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index);
Amir Goldstein359f3922017-06-21 15:28:41 +0300278int ovl_get_index_name(struct dentry *origin, struct qstr *name);
Amir Goldstein91ffe7b2017-12-28 20:23:05 +0200279struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh);
Amir Goldstein06170152018-01-17 14:40:27 +0200280struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
281 struct dentry *origin, bool verify);
Miklos Szeredibbb1e542016-12-16 11:02:56 +0100282int ovl_path_next(int idx, struct dentry *dentry, struct path *path);
Amir Goldstein1eff1a12017-12-12 22:40:46 +0200283struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
284 unsigned int flags);
Miklos Szeredibbb1e542016-12-16 11:02:56 +0100285bool ovl_lower_positive(struct dentry *dentry);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200286
Amir Goldstein05122442018-01-11 08:25:32 +0200287static inline int ovl_verify_origin(struct dentry *upper,
288 struct dentry *origin, bool set)
289{
290 return ovl_verify_set_fh(upper, OVL_XATTR_ORIGIN, origin, false, set);
291}
292
Amir Goldsteinad1d6152018-01-11 10:47:03 +0200293static inline int ovl_verify_upper(struct dentry *index,
294 struct dentry *upper, bool set)
295{
296 return ovl_verify_set_fh(index, OVL_XATTR_UPPER, upper, true, set);
297}
298
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200299/* readdir.c */
300extern const struct file_operations ovl_dir_operations;
301int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
302void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list);
303void ovl_cache_free(struct list_head *list);
Miklos Szeredi4edb83b2017-07-27 21:54:06 +0200304void ovl_dir_cache_free(struct inode *inode);
Vivek Goyal45aebea2016-02-22 09:28:34 -0500305int ovl_check_d_type_supported(struct path *realpath);
Miklos Szeredieea2fb42016-09-01 11:11:59 +0200306void ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt,
307 struct dentry *dentry, int level);
Amir Goldstein1eff1a12017-12-12 22:40:46 +0200308int ovl_indexdir_cleanup(struct ovl_fs *ofs);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200309
310/* inode.c */
Amir Goldstein5f8415d2017-06-20 15:35:14 +0300311int ovl_set_nlink_upper(struct dentry *dentry);
312int ovl_set_nlink_lower(struct dentry *dentry);
Amir Goldsteincaf70cb2017-06-21 13:46:12 +0300313unsigned int ovl_get_nlink(struct dentry *lowerdentry,
314 struct dentry *upperdentry,
315 unsigned int fallback);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200316int ovl_setattr(struct dentry *dentry, struct iattr *attr);
Miklos Szeredi5b712092017-05-05 11:38:58 +0200317int ovl_getattr(const struct path *path, struct kstat *stat,
318 u32 request_mask, unsigned int flags);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200319int ovl_permission(struct inode *inode, int mask);
Miklos Szeredi1d88f182017-07-20 11:08:21 +0200320int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
321 const void *value, size_t size, int flags);
322int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name,
Andreas Gruenbacher0eb45fc2016-08-22 17:52:55 +0200323 void *value, size_t size);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200324ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
Vivek Goyal39a25b22016-07-01 16:34:26 -0400325struct posix_acl *ovl_get_acl(struct inode *inode, int type);
Miklos Szeredi2d902672016-06-30 08:53:27 +0200326int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags);
Miklos Szeredid719e8f2016-07-29 12:05:23 +0200327int ovl_update_time(struct inode *inode, struct timespec *ts, int flags);
Miklos Szeredi09562542016-08-08 15:08:49 +0200328bool ovl_is_private_xattr(const char *name);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200329
Miklos Szeredica4c8a32016-12-16 11:02:55 +0100330struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev);
Amir Goldstein4b91c302018-01-18 16:39:13 +0200331struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real,
332 bool is_upper);
Amir Goldstein0aceb532017-12-12 23:43:16 +0200333struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry,
334 struct dentry *lowerdentry, struct dentry *index,
335 unsigned int numlower);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200336static inline void ovl_copyattr(struct inode *from, struct inode *to)
337{
338 to->i_uid = from->i_uid;
339 to->i_gid = from->i_gid;
Vivek Goyal07a2daa2016-07-01 16:34:25 -0400340 to->i_mode = from->i_mode;
Miklos Szeredid719e8f2016-07-29 12:05:23 +0200341 to->i_atime = from->i_atime;
342 to->i_mtime = from->i_mtime;
343 to->i_ctime = from->i_ctime;
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200344}
345
346/* dir.c */
347extern const struct inode_operations ovl_dir_inode_operations;
Miklos Szeredi3d275732017-05-19 09:33:49 +0200348struct dentry *ovl_lookup_temp(struct dentry *workdir);
Amir Goldsteine7dd0e72017-10-24 17:38:33 +0300349int ovl_cleanup_and_whiteout(struct dentry *workdir, struct inode *dir,
350 struct dentry *dentry);
Al Viro32a3d842016-12-04 17:33:17 +0000351struct cattr {
352 dev_t rdev;
353 umode_t mode;
354 const char *link;
355};
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200356int ovl_create_real(struct inode *dir, struct dentry *newdentry,
Al Viro32a3d842016-12-04 17:33:17 +0000357 struct cattr *attr,
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200358 struct dentry *hardlink, bool debug);
Amir Goldstein415543d2017-06-21 15:28:42 +0300359int ovl_cleanup(struct inode *dir, struct dentry *dentry);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200360
361/* copy_up.c */
362int ovl_copy_up(struct dentry *dentry);
Amir Goldstein9aba6522016-11-12 21:36:03 +0200363int ovl_copy_up_flags(struct dentry *dentry, int flags);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200364int ovl_copy_xattr(struct dentry *old, struct dentry *new);
365int ovl_set_attr(struct dentry *upper, struct kstat *stat);
Amir Goldstein5b2cccd2018-02-02 10:42:03 +0200366struct ovl_fh *ovl_encode_real_fh(struct dentry *real, bool is_upper);
Amir Goldstein9678e632018-01-03 19:34:45 +0200367int ovl_set_origin(struct dentry *dentry, struct dentry *lower,
368 struct dentry *upper);
Amir Goldstein8ed5eec2017-07-12 14:17:16 +0300369
370/* export.c */
371extern const struct export_operations ovl_export_operations;