blob: d176b679f526577f4526f3dd3fb3557474460179 [file] [log] [blame]
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>
11
12struct ovl_entry;
13
14enum ovl_path_type {
Miklos Szeredi1afaba12014-12-13 00:59:42 +010015 __OVL_PATH_PURE = (1 << 0),
16 __OVL_PATH_UPPER = (1 << 1),
17 __OVL_PATH_MERGE = (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)
22#define OVL_TYPE_PURE_UPPER(type) ((type) & __OVL_PATH_PURE)
23#define OVL_TYPE_MERGE_OR_LOWER(type) \
24 (OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type))
25
Miklos Szeredie9be9d52014-10-24 00:14:38 +020026extern const char *ovl_opaque_xattr;
27
28static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
29{
30 int err = vfs_rmdir(dir, dentry);
31 pr_debug("rmdir(%pd2) = %i\n", dentry, err);
32 return err;
33}
34
35static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry)
36{
37 int err = vfs_unlink(dir, dentry, NULL);
38 pr_debug("unlink(%pd2) = %i\n", dentry, err);
39 return err;
40}
41
42static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir,
43 struct dentry *new_dentry, bool debug)
44{
45 int err = vfs_link(old_dentry, dir, new_dentry, NULL);
46 if (debug) {
47 pr_debug("link(%pd2, %pd2) = %i\n",
48 old_dentry, new_dentry, err);
49 }
50 return err;
51}
52
53static inline int ovl_do_create(struct inode *dir, struct dentry *dentry,
54 umode_t mode, bool debug)
55{
56 int err = vfs_create(dir, dentry, mode, true);
57 if (debug)
58 pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
59 return err;
60}
61
62static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry,
63 umode_t mode, bool debug)
64{
65 int err = vfs_mkdir(dir, dentry, mode);
66 if (debug)
67 pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
68 return err;
69}
70
71static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry,
72 umode_t mode, dev_t dev, bool debug)
73{
74 int err = vfs_mknod(dir, dentry, mode, dev);
75 if (debug) {
76 pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n",
77 dentry, mode, dev, err);
78 }
79 return err;
80}
81
82static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry,
83 const char *oldname, bool debug)
84{
85 int err = vfs_symlink(dir, dentry, oldname);
86 if (debug)
87 pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
88 return err;
89}
90
91static inline int ovl_do_setxattr(struct dentry *dentry, const char *name,
92 const void *value, size_t size, int flags)
93{
94 int err = vfs_setxattr(dentry, name, value, size, flags);
95 pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n",
96 dentry, name, (int) size, (char *) value, flags, err);
97 return err;
98}
99
100static inline int ovl_do_removexattr(struct dentry *dentry, const char *name)
101{
102 int err = vfs_removexattr(dentry, name);
103 pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
104 return err;
105}
106
107static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry,
108 struct inode *newdir, struct dentry *newdentry,
109 unsigned int flags)
110{
111 int err;
112
113 pr_debug("rename2(%pd2, %pd2, 0x%x)\n",
114 olddentry, newdentry, flags);
115
116 err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);
117
118 if (err) {
119 pr_debug("...rename2(%pd2, %pd2, ...) = %i\n",
120 olddentry, newdentry, err);
121 }
122 return err;
123}
124
125static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
126{
127 int err = vfs_whiteout(dir, dentry);
128 pr_debug("whiteout(%pd2) = %i\n", dentry, err);
129 return err;
130}
131
132enum ovl_path_type ovl_path_type(struct dentry *dentry);
133u64 ovl_dentry_version_get(struct dentry *dentry);
134void ovl_dentry_version_inc(struct dentry *dentry);
135void ovl_path_upper(struct dentry *dentry, struct path *path);
136void ovl_path_lower(struct dentry *dentry, struct path *path);
137enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
Miklos Szeredi5ef88da2014-12-13 00:59:43 +0100138int ovl_path_next(int idx, struct dentry *dentry, struct path *path);
Miklos Szeredie9be9d52014-10-24 00:14:38 +0200139struct dentry *ovl_dentry_upper(struct dentry *dentry);
140struct dentry *ovl_dentry_lower(struct dentry *dentry);
141struct dentry *ovl_dentry_real(struct dentry *dentry);
142struct dentry *ovl_entry_real(struct ovl_entry *oe, bool *is_upper);
143struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry);
144void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache);
145struct dentry *ovl_workdir(struct dentry *dentry);
146int ovl_want_write(struct dentry *dentry);
147void ovl_drop_write(struct dentry *dentry);
148bool ovl_dentry_is_opaque(struct dentry *dentry);
149void ovl_dentry_set_opaque(struct dentry *dentry, bool opaque);
150bool ovl_is_whiteout(struct dentry *dentry);
151void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry);
152struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
153 unsigned int flags);
154struct file *ovl_path_open(struct path *path, int flags);
155
156struct dentry *ovl_upper_create(struct dentry *upperdir, struct dentry *dentry,
157 struct kstat *stat, const char *link);
158
159/* readdir.c */
160extern const struct file_operations ovl_dir_operations;
161int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
162void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list);
163void ovl_cache_free(struct list_head *list);
164
165/* inode.c */
166int ovl_setattr(struct dentry *dentry, struct iattr *attr);
167int ovl_permission(struct inode *inode, int mask);
168int ovl_setxattr(struct dentry *dentry, const char *name,
169 const void *value, size_t size, int flags);
170ssize_t ovl_getxattr(struct dentry *dentry, const char *name,
171 void *value, size_t size);
172ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
173int ovl_removexattr(struct dentry *dentry, const char *name);
174
175struct inode *ovl_new_inode(struct super_block *sb, umode_t mode,
176 struct ovl_entry *oe);
177static inline void ovl_copyattr(struct inode *from, struct inode *to)
178{
179 to->i_uid = from->i_uid;
180 to->i_gid = from->i_gid;
181}
182
183/* dir.c */
184extern const struct inode_operations ovl_dir_inode_operations;
185struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry);
186int ovl_create_real(struct inode *dir, struct dentry *newdentry,
187 struct kstat *stat, const char *link,
188 struct dentry *hardlink, bool debug);
189void ovl_cleanup(struct inode *dir, struct dentry *dentry);
190
191/* copy_up.c */
192int ovl_copy_up(struct dentry *dentry);
193int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
194 struct path *lowerpath, struct kstat *stat,
195 struct iattr *attr);
196int ovl_copy_xattr(struct dentry *old, struct dentry *new);
197int ovl_set_attr(struct dentry *upper, struct kstat *stat);