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e9be9d5e MS |
1 | /* |
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 | ||
e9be9d5e | 12 | enum ovl_path_type { |
38e813db MS |
13 | __OVL_PATH_UPPER = (1 << 0), |
14 | __OVL_PATH_MERGE = (1 << 1), | |
e9be9d5e MS |
15 | }; |
16 | ||
1afaba1e MS |
17 | #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) |
18 | #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) | |
d837a49b | 19 | |
fe2b7595 AG |
20 | #define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay." |
21 | #define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque" | |
02b69b28 | 22 | #define OVL_XATTR_REDIRECT OVL_XATTR_PREFIX "redirect" |
e9be9d5e | 23 | |
39b681f8 MS |
24 | #define OVL_ISUPPER_MASK 1UL |
25 | ||
e9be9d5e MS |
26 | static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry) |
27 | { | |
28 | int err = vfs_rmdir(dir, dentry); | |
29 | pr_debug("rmdir(%pd2) = %i\n", dentry, err); | |
30 | return err; | |
31 | } | |
32 | ||
33 | static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry) | |
34 | { | |
35 | int err = vfs_unlink(dir, dentry, NULL); | |
36 | pr_debug("unlink(%pd2) = %i\n", dentry, err); | |
37 | return err; | |
38 | } | |
39 | ||
40 | static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir, | |
41 | struct dentry *new_dentry, bool debug) | |
42 | { | |
43 | int err = vfs_link(old_dentry, dir, new_dentry, NULL); | |
44 | if (debug) { | |
45 | pr_debug("link(%pd2, %pd2) = %i\n", | |
46 | old_dentry, new_dentry, err); | |
47 | } | |
48 | return err; | |
49 | } | |
50 | ||
51 | static inline int ovl_do_create(struct inode *dir, struct dentry *dentry, | |
52 | umode_t mode, bool debug) | |
53 | { | |
54 | int err = vfs_create(dir, dentry, mode, true); | |
55 | if (debug) | |
56 | pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); | |
57 | return err; | |
58 | } | |
59 | ||
60 | static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry, | |
61 | umode_t mode, bool debug) | |
62 | { | |
63 | int err = vfs_mkdir(dir, dentry, mode); | |
64 | if (debug) | |
65 | pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); | |
66 | return err; | |
67 | } | |
68 | ||
69 | static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry, | |
70 | umode_t mode, dev_t dev, bool debug) | |
71 | { | |
72 | int err = vfs_mknod(dir, dentry, mode, dev); | |
73 | if (debug) { | |
74 | pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", | |
75 | dentry, mode, dev, err); | |
76 | } | |
77 | return err; | |
78 | } | |
79 | ||
80 | static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry, | |
81 | const char *oldname, bool debug) | |
82 | { | |
83 | int err = vfs_symlink(dir, dentry, oldname); | |
84 | if (debug) | |
85 | pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); | |
86 | return err; | |
87 | } | |
88 | ||
89 | static inline int ovl_do_setxattr(struct dentry *dentry, const char *name, | |
90 | const void *value, size_t size, int flags) | |
91 | { | |
25b33138 SF |
92 | struct inode *inode = dentry->d_inode; |
93 | int err; | |
94 | ||
95 | inode_lock(inode); | |
96 | err = __vfs_setxattr_noperm(dentry, name, value, size, flags); | |
97 | inode_unlock(inode); | |
98 | ||
e9be9d5e MS |
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 | ||
104 | static inline int ovl_do_removexattr(struct dentry *dentry, const char *name) | |
105 | { | |
25b33138 SF |
106 | struct inode *inode = dentry->d_inode; |
107 | int err; | |
108 | ||
109 | inode_lock(inode); | |
110 | err = __vfs_removexattr_noperm(dentry, name); | |
111 | inode_unlock(inode); | |
112 | ||
e9be9d5e MS |
113 | pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); |
114 | return err; | |
115 | } | |
116 | ||
117 | static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry, | |
118 | struct inode *newdir, struct dentry *newdentry, | |
119 | unsigned int flags) | |
120 | { | |
121 | int err; | |
122 | ||
2773bf00 | 123 | pr_debug("rename(%pd2, %pd2, 0x%x)\n", |
e9be9d5e MS |
124 | olddentry, newdentry, flags); |
125 | ||
126 | err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags); | |
127 | ||
128 | if (err) { | |
2773bf00 | 129 | pr_debug("...rename(%pd2, %pd2, ...) = %i\n", |
e9be9d5e MS |
130 | olddentry, newdentry, err); |
131 | } | |
132 | return err; | |
133 | } | |
134 | ||
135 | static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry) | |
136 | { | |
137 | int err = vfs_whiteout(dir, dentry); | |
138 | pr_debug("whiteout(%pd2) = %i\n", dentry, err); | |
139 | return err; | |
140 | } | |
141 | ||
39b681f8 MS |
142 | static inline struct inode *ovl_inode_real(struct inode *inode, bool *is_upper) |
143 | { | |
144 | unsigned long x = (unsigned long) READ_ONCE(inode->i_private); | |
145 | ||
146 | if (is_upper) | |
147 | *is_upper = x & OVL_ISUPPER_MASK; | |
148 | ||
149 | return (struct inode *) (x & ~OVL_ISUPPER_MASK); | |
150 | } | |
151 | ||
bbb1e54d MS |
152 | /* util.c */ |
153 | int ovl_want_write(struct dentry *dentry); | |
154 | void ovl_drop_write(struct dentry *dentry); | |
155 | struct dentry *ovl_workdir(struct dentry *dentry); | |
156 | const struct cred *ovl_override_creds(struct super_block *sb); | |
157 | struct ovl_entry *ovl_alloc_entry(unsigned int numlower); | |
158 | bool ovl_dentry_remote(struct dentry *dentry); | |
159 | bool ovl_dentry_weird(struct dentry *dentry); | |
e9be9d5e | 160 | enum ovl_path_type ovl_path_type(struct dentry *dentry); |
e9be9d5e MS |
161 | void ovl_path_upper(struct dentry *dentry, struct path *path); |
162 | void ovl_path_lower(struct dentry *dentry, struct path *path); | |
163 | enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); | |
164 | struct dentry *ovl_dentry_upper(struct dentry *dentry); | |
165 | struct dentry *ovl_dentry_lower(struct dentry *dentry); | |
166 | struct dentry *ovl_dentry_real(struct dentry *dentry); | |
e9be9d5e MS |
167 | struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry); |
168 | void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache); | |
e9be9d5e | 169 | bool ovl_dentry_is_opaque(struct dentry *dentry); |
c412ce49 | 170 | bool ovl_dentry_is_whiteout(struct dentry *dentry); |
5cf5b477 | 171 | void ovl_dentry_set_opaque(struct dentry *dentry); |
a6c60655 MS |
172 | bool ovl_redirect_dir(struct super_block *sb); |
173 | void ovl_clear_redirect_dir(struct super_block *sb); | |
174 | const char *ovl_dentry_get_redirect(struct dentry *dentry); | |
175 | void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); | |
e9be9d5e | 176 | void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry); |
bbb1e54d MS |
177 | void ovl_inode_init(struct inode *inode, struct inode *realinode, |
178 | bool is_upper); | |
39b681f8 | 179 | void ovl_inode_update(struct inode *inode, struct inode *upperinode); |
bbb1e54d MS |
180 | void ovl_dentry_version_inc(struct dentry *dentry); |
181 | u64 ovl_dentry_version_get(struct dentry *dentry); | |
182 | bool ovl_is_whiteout(struct dentry *dentry); | |
e9be9d5e MS |
183 | struct file *ovl_path_open(struct path *path, int flags); |
184 | ||
bbb1e54d MS |
185 | /* namei.c */ |
186 | int ovl_path_next(int idx, struct dentry *dentry, struct path *path); | |
187 | struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags); | |
188 | bool ovl_lower_positive(struct dentry *dentry); | |
e9be9d5e MS |
189 | |
190 | /* readdir.c */ | |
191 | extern const struct file_operations ovl_dir_operations; | |
192 | int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); | |
193 | void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); | |
194 | void ovl_cache_free(struct list_head *list); | |
45aebeaf | 195 | int ovl_check_d_type_supported(struct path *realpath); |
eea2fb48 MS |
196 | void ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt, |
197 | struct dentry *dentry, int level); | |
e9be9d5e MS |
198 | |
199 | /* inode.c */ | |
200 | int ovl_setattr(struct dentry *dentry, struct iattr *attr); | |
201 | int ovl_permission(struct inode *inode, int mask); | |
0e585ccc AG |
202 | int ovl_xattr_set(struct dentry *dentry, const char *name, const void *value, |
203 | size_t size, int flags); | |
0eb45fc3 AG |
204 | int ovl_xattr_get(struct dentry *dentry, const char *name, |
205 | void *value, size_t size); | |
e9be9d5e | 206 | ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); |
39a25b2b | 207 | struct posix_acl *ovl_get_acl(struct inode *inode, int type); |
2d902671 | 208 | int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags); |
d719e8f2 | 209 | int ovl_update_time(struct inode *inode, struct timespec *ts, int flags); |
0956254a | 210 | bool ovl_is_private_xattr(const char *name); |
e9be9d5e | 211 | |
ca4c8a3a | 212 | struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); |
51f7e52d | 213 | struct inode *ovl_get_inode(struct super_block *sb, struct inode *realinode); |
e9be9d5e MS |
214 | static inline void ovl_copyattr(struct inode *from, struct inode *to) |
215 | { | |
216 | to->i_uid = from->i_uid; | |
217 | to->i_gid = from->i_gid; | |
07a2daab | 218 | to->i_mode = from->i_mode; |
d719e8f2 MS |
219 | to->i_atime = from->i_atime; |
220 | to->i_mtime = from->i_mtime; | |
221 | to->i_ctime = from->i_ctime; | |
e9be9d5e MS |
222 | } |
223 | ||
224 | /* dir.c */ | |
225 | extern const struct inode_operations ovl_dir_inode_operations; | |
226 | struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry); | |
32a3d848 AV |
227 | struct cattr { |
228 | dev_t rdev; | |
229 | umode_t mode; | |
230 | const char *link; | |
231 | }; | |
e9be9d5e | 232 | int ovl_create_real(struct inode *dir, struct dentry *newdentry, |
32a3d848 | 233 | struct cattr *attr, |
e9be9d5e MS |
234 | struct dentry *hardlink, bool debug); |
235 | void ovl_cleanup(struct inode *dir, struct dentry *dentry); | |
236 | ||
237 | /* copy_up.c */ | |
238 | int ovl_copy_up(struct dentry *dentry); | |
9aba6521 | 239 | int ovl_copy_up_flags(struct dentry *dentry, int flags); |
e9be9d5e MS |
240 | int ovl_copy_xattr(struct dentry *old, struct dentry *new); |
241 | int ovl_set_attr(struct dentry *upper, struct kstat *stat); |