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10#include <linux/kernel.h>
11
12struct ovl_entry;
13
14enum ovl_path_type {
15 __OVL_PATH_PURE = (1 << 0),
16 __OVL_PATH_UPPER = (1 << 1),
17 __OVL_PATH_MERGE = (1 << 2),
18};
19
20#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
26
27#define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay."
28#define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque"
29
30#define OVL_ISUPPER_MASK 1UL
31
32static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
33{
34 int err = vfs_rmdir(dir, dentry);
35 pr_debug("rmdir(%pd2) = %i\n", dentry, err);
36 return err;
37}
38
39static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry)
40{
41 int err = vfs_unlink(dir, dentry, NULL);
42 pr_debug("unlink(%pd2) = %i\n", dentry, err);
43 return err;
44}
45
46static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir,
47 struct dentry *new_dentry, bool debug)
48{
49 int err = vfs_link(old_dentry, dir, new_dentry, NULL);
50 if (debug) {
51 pr_debug("link(%pd2, %pd2) = %i\n",
52 old_dentry, new_dentry, err);
53 }
54 return err;
55}
56
57static inline int ovl_do_create(struct inode *dir, struct dentry *dentry,
58 umode_t mode, bool debug)
59{
60 int err = vfs_create(dir, dentry, mode, true);
61 if (debug)
62 pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
63 return err;
64}
65
66static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry,
67 umode_t mode, bool debug)
68{
69 int err = vfs_mkdir(dir, dentry, mode);
70 if (debug)
71 pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
72 return err;
73}
74
75static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry,
76 umode_t mode, dev_t dev, bool debug)
77{
78 int err = vfs_mknod(dir, dentry, mode, dev);
79 if (debug) {
80 pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n",
81 dentry, mode, dev, err);
82 }
83 return err;
84}
85
86static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry,
87 const char *oldname, bool debug)
88{
89 int err = vfs_symlink(dir, dentry, oldname);
90 if (debug)
91 pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
92 return err;
93}
94
95static inline int ovl_do_setxattr(struct dentry *dentry, const char *name,
96 const void *value, size_t size, int flags)
97{
98 int err = vfs_setxattr(dentry, name, value, size, flags);
99 pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n",
100 dentry, name, (int) size, (char *) value, flags, err);
101 return err;
102}
103
104static inline int ovl_do_removexattr(struct dentry *dentry, const char *name)
105{
106 int err = vfs_removexattr(dentry, name);
107 pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
108 return err;
109}
110
111static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry,
112 struct inode *newdir, struct dentry *newdentry,
113 unsigned int flags)
114{
115 int err;
116
117 pr_debug("rename2(%pd2, %pd2, 0x%x)\n",
118 olddentry, newdentry, flags);
119
120 err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);
121
122 if (err) {
123 pr_debug("...rename2(%pd2, %pd2, ...) = %i\n",
124 olddentry, newdentry, err);
125 }
126 return err;
127}
128
129static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
130{
131 int err = vfs_whiteout(dir, dentry);
132 pr_debug("whiteout(%pd2) = %i\n", dentry, err);
133 return err;
134}
135
136static inline struct inode *ovl_inode_real(struct inode *inode, bool *is_upper)
137{
138 unsigned long x = (unsigned long) READ_ONCE(inode->i_private);
139
140 if (is_upper)
141 *is_upper = x & OVL_ISUPPER_MASK;
142
143 return (struct inode *) (x & ~OVL_ISUPPER_MASK);
144}
145
146enum ovl_path_type ovl_path_type(struct dentry *dentry);
147u64 ovl_dentry_version_get(struct dentry *dentry);
148void ovl_dentry_version_inc(struct dentry *dentry);
149void ovl_path_upper(struct dentry *dentry, struct path *path);
150void ovl_path_lower(struct dentry *dentry, struct path *path);
151enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
152int ovl_path_next(int idx, struct dentry *dentry, struct path *path);
153struct dentry *ovl_dentry_upper(struct dentry *dentry);
154struct dentry *ovl_dentry_lower(struct dentry *dentry);
155struct dentry *ovl_dentry_real(struct dentry *dentry);
156struct vfsmount *ovl_entry_mnt_real(struct ovl_entry *oe, struct inode *inode,
157 bool is_upper);
158struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry);
159void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache);
160struct dentry *ovl_workdir(struct dentry *dentry);
161int ovl_want_write(struct dentry *dentry);
162void ovl_drop_write(struct dentry *dentry);
163bool ovl_dentry_is_opaque(struct dentry *dentry);
164void ovl_dentry_set_opaque(struct dentry *dentry, bool opaque);
165bool ovl_is_whiteout(struct dentry *dentry);
166const struct cred *ovl_override_creds(struct super_block *sb);
167void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry);
168void ovl_inode_update(struct inode *inode, struct inode *upperinode);
169struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
170 unsigned int flags);
171struct file *ovl_path_open(struct path *path, int flags);
172
173struct dentry *ovl_upper_create(struct dentry *upperdir, struct dentry *dentry,
174 struct kstat *stat, const char *link);
175
176
177extern const struct file_operations ovl_dir_operations;
178int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
179void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list);
180void ovl_cache_free(struct list_head *list);
181int ovl_check_d_type_supported(struct path *realpath);
182void ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt,
183 struct dentry *dentry, int level);
184
185
186int ovl_setattr(struct dentry *dentry, struct iattr *attr);
187int ovl_permission(struct inode *inode, int mask);
188int ovl_xattr_set(struct dentry *dentry, const char *name, const void *value,
189 size_t size, int flags);
190int ovl_xattr_get(struct dentry *dentry, const char *name,
191 void *value, size_t size);
192ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
193struct posix_acl *ovl_get_acl(struct inode *inode, int type);
194int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags);
195int ovl_update_time(struct inode *inode, struct timespec *ts, int flags);
196bool ovl_is_private_xattr(const char *name);
197
198struct inode *ovl_new_inode(struct super_block *sb, umode_t mode);
199struct inode *ovl_get_inode(struct super_block *sb, struct inode *realinode);
200static inline void ovl_copyattr(struct inode *from, struct inode *to)
201{
202 to->i_uid = from->i_uid;
203 to->i_gid = from->i_gid;
204 to->i_mode = from->i_mode;
205 to->i_atime = from->i_atime;
206 to->i_mtime = from->i_mtime;
207 to->i_ctime = from->i_ctime;
208}
209
210
211extern const struct inode_operations ovl_dir_inode_operations;
212struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry);
213int ovl_create_real(struct inode *dir, struct dentry *newdentry,
214 struct kstat *stat, const char *link,
215 struct dentry *hardlink, bool debug);
216void ovl_cleanup(struct inode *dir, struct dentry *dentry);
217
218
219int ovl_copy_up(struct dentry *dentry);
220int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
221 struct path *lowerpath, struct kstat *stat);
222int ovl_copy_xattr(struct dentry *old, struct dentry *new);
223int ovl_set_attr(struct dentry *upper, struct kstat *stat);
224
