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Commit | Line | Data |
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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> | |
3a1e819b | 11 | #include <linux/uuid.h> |
e9be9d5e | 12 | |
e9be9d5e | 13 | enum ovl_path_type { |
38e813db MS |
14 | __OVL_PATH_UPPER = (1 << 0), |
15 | __OVL_PATH_MERGE = (1 << 1), | |
59548503 | 16 | __OVL_PATH_ORIGIN = (1 << 2), |
e9be9d5e MS |
17 | }; |
18 | ||
1afaba1e MS |
19 | #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) |
20 | #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) | |
59548503 | 21 | #define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN) |
d837a49b | 22 | |
fe2b7595 AG |
23 | #define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay." |
24 | #define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque" | |
02b69b28 | 25 | #define OVL_XATTR_REDIRECT OVL_XATTR_PREFIX "redirect" |
3a1e819b | 26 | #define OVL_XATTR_ORIGIN OVL_XATTR_PREFIX "origin" |
ee1d6d37 | 27 | #define OVL_XATTR_IMPURE OVL_XATTR_PREFIX "impure" |
3a1e819b | 28 | |
13c72075 MS |
29 | enum ovl_flag { |
30 | OVL_IMPURE, | |
359f392c | 31 | OVL_INDEX, |
13c72075 MS |
32 | }; |
33 | ||
3a1e819b AG |
34 | /* |
35 | * The tuple (fh,uuid) is a universal unique identifier for a copy up origin, | |
36 | * where: | |
37 | * origin.fh - exported file handle of the lower file | |
38 | * origin.uuid - uuid of the lower filesystem | |
39 | */ | |
40 | #define OVL_FH_VERSION 0 | |
41 | #define OVL_FH_MAGIC 0xfb | |
42 | ||
43 | /* CPU byte order required for fid decoding: */ | |
44 | #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) | |
45 | #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) | |
54fb347e AG |
46 | /* Is the real inode encoded in fid an upper inode? */ |
47 | #define OVL_FH_FLAG_PATH_UPPER (1 << 2) | |
3a1e819b AG |
48 | |
49 | #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN) | |
50 | ||
51 | #if defined(__LITTLE_ENDIAN) | |
52 | #define OVL_FH_FLAG_CPU_ENDIAN 0 | |
53 | #elif defined(__BIG_ENDIAN) | |
54 | #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN | |
55 | #else | |
56 | #error Endianness not defined | |
57 | #endif | |
58 | ||
59 | /* On-disk and in-memeory format for redirect by file handle */ | |
60 | struct ovl_fh { | |
61 | u8 version; /* 0 */ | |
62 | u8 magic; /* 0xfb */ | |
63 | u8 len; /* size of this header + size of fid */ | |
64 | u8 flags; /* OVL_FH_FLAG_* */ | |
65 | u8 type; /* fid_type of fid */ | |
01633fd2 | 66 | uuid_t uuid; /* uuid of filesystem */ |
3a1e819b AG |
67 | u8 fid[0]; /* file identifier */ |
68 | } __packed; | |
e9be9d5e MS |
69 | |
70 | static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry) | |
71 | { | |
72 | int err = vfs_rmdir(dir, dentry); | |
73 | pr_debug("rmdir(%pd2) = %i\n", dentry, err); | |
74 | return err; | |
75 | } | |
76 | ||
77 | static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry) | |
78 | { | |
79 | int err = vfs_unlink(dir, dentry, NULL); | |
80 | pr_debug("unlink(%pd2) = %i\n", dentry, err); | |
81 | return err; | |
82 | } | |
83 | ||
84 | static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir, | |
85 | struct dentry *new_dentry, bool debug) | |
86 | { | |
87 | int err = vfs_link(old_dentry, dir, new_dentry, NULL); | |
88 | if (debug) { | |
89 | pr_debug("link(%pd2, %pd2) = %i\n", | |
90 | old_dentry, new_dentry, err); | |
91 | } | |
92 | return err; | |
93 | } | |
94 | ||
95 | static inline int ovl_do_create(struct inode *dir, struct dentry *dentry, | |
96 | umode_t mode, bool debug) | |
97 | { | |
98 | int err = vfs_create(dir, dentry, mode, true); | |
99 | if (debug) | |
100 | pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); | |
101 | return err; | |
102 | } | |
103 | ||
104 | static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry, | |
105 | umode_t mode, bool debug) | |
106 | { | |
107 | int err = vfs_mkdir(dir, dentry, mode); | |
108 | if (debug) | |
109 | pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); | |
110 | return err; | |
111 | } | |
112 | ||
113 | static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry, | |
114 | umode_t mode, dev_t dev, bool debug) | |
115 | { | |
116 | int err = vfs_mknod(dir, dentry, mode, dev); | |
117 | if (debug) { | |
118 | pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", | |
119 | dentry, mode, dev, err); | |
120 | } | |
121 | return err; | |
122 | } | |
123 | ||
124 | static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry, | |
125 | const char *oldname, bool debug) | |
126 | { | |
127 | int err = vfs_symlink(dir, dentry, oldname); | |
128 | if (debug) | |
129 | pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); | |
130 | return err; | |
131 | } | |
132 | ||
133 | static inline int ovl_do_setxattr(struct dentry *dentry, const char *name, | |
134 | const void *value, size_t size, int flags) | |
135 | { | |
136 | int err = vfs_setxattr(dentry, name, value, size, flags); | |
137 | pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n", | |
138 | dentry, name, (int) size, (char *) value, flags, err); | |
139 | return err; | |
140 | } | |
141 | ||
142 | static inline int ovl_do_removexattr(struct dentry *dentry, const char *name) | |
143 | { | |
144 | int err = vfs_removexattr(dentry, name); | |
145 | pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); | |
146 | return err; | |
147 | } | |
148 | ||
149 | static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry, | |
150 | struct inode *newdir, struct dentry *newdentry, | |
151 | unsigned int flags) | |
152 | { | |
153 | int err; | |
154 | ||
2773bf00 | 155 | pr_debug("rename(%pd2, %pd2, 0x%x)\n", |
e9be9d5e MS |
156 | olddentry, newdentry, flags); |
157 | ||
158 | err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags); | |
159 | ||
160 | if (err) { | |
2773bf00 | 161 | pr_debug("...rename(%pd2, %pd2, ...) = %i\n", |
e9be9d5e MS |
162 | olddentry, newdentry, err); |
163 | } | |
164 | return err; | |
165 | } | |
166 | ||
167 | static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry) | |
168 | { | |
169 | int err = vfs_whiteout(dir, dentry); | |
170 | pr_debug("whiteout(%pd2) = %i\n", dentry, err); | |
171 | return err; | |
172 | } | |
173 | ||
e7f52429 AG |
174 | static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode) |
175 | { | |
176 | struct dentry *ret = vfs_tmpfile(dentry, mode, 0); | |
177 | int err = IS_ERR(ret) ? PTR_ERR(ret) : 0; | |
178 | ||
179 | pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); | |
180 | return ret; | |
181 | } | |
182 | ||
bbb1e54d MS |
183 | /* util.c */ |
184 | int ovl_want_write(struct dentry *dentry); | |
185 | void ovl_drop_write(struct dentry *dentry); | |
186 | struct dentry *ovl_workdir(struct dentry *dentry); | |
187 | const struct cred *ovl_override_creds(struct super_block *sb); | |
7bcd74b9 | 188 | struct super_block *ovl_same_sb(struct super_block *sb); |
02bcd157 AG |
189 | bool ovl_can_decode_fh(struct super_block *sb); |
190 | struct dentry *ovl_indexdir(struct super_block *sb); | |
bbb1e54d MS |
191 | struct ovl_entry *ovl_alloc_entry(unsigned int numlower); |
192 | bool ovl_dentry_remote(struct dentry *dentry); | |
193 | bool ovl_dentry_weird(struct dentry *dentry); | |
e9be9d5e | 194 | enum ovl_path_type ovl_path_type(struct dentry *dentry); |
e9be9d5e MS |
195 | void ovl_path_upper(struct dentry *dentry, struct path *path); |
196 | void ovl_path_lower(struct dentry *dentry, struct path *path); | |
197 | enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); | |
198 | struct dentry *ovl_dentry_upper(struct dentry *dentry); | |
199 | struct dentry *ovl_dentry_lower(struct dentry *dentry); | |
200 | struct dentry *ovl_dentry_real(struct dentry *dentry); | |
09d8b586 MS |
201 | struct inode *ovl_inode_upper(struct inode *inode); |
202 | struct inode *ovl_inode_lower(struct inode *inode); | |
203 | struct inode *ovl_inode_real(struct inode *inode); | |
e9be9d5e MS |
204 | struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry); |
205 | void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache); | |
e9be9d5e | 206 | bool ovl_dentry_is_opaque(struct dentry *dentry); |
c412ce49 | 207 | bool ovl_dentry_is_whiteout(struct dentry *dentry); |
5cf5b477 | 208 | void ovl_dentry_set_opaque(struct dentry *dentry); |
a6c60655 | 209 | bool ovl_redirect_dir(struct super_block *sb); |
a6c60655 MS |
210 | const char *ovl_dentry_get_redirect(struct dentry *dentry); |
211 | void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); | |
09d8b586 MS |
212 | void ovl_inode_init(struct inode *inode, struct dentry *upperdentry, |
213 | struct dentry *lowerdentry); | |
214 | void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); | |
bbb1e54d MS |
215 | void ovl_dentry_version_inc(struct dentry *dentry); |
216 | u64 ovl_dentry_version_get(struct dentry *dentry); | |
217 | bool ovl_is_whiteout(struct dentry *dentry); | |
e9be9d5e | 218 | struct file *ovl_path_open(struct path *path, int flags); |
39d3d60a AG |
219 | int ovl_copy_up_start(struct dentry *dentry); |
220 | void ovl_copy_up_end(struct dentry *dentry); | |
f3a15685 AG |
221 | bool ovl_check_dir_xattr(struct dentry *dentry, const char *name); |
222 | int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry, | |
223 | const char *name, const void *value, size_t size, | |
224 | int xerr); | |
225 | int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); | |
13c72075 MS |
226 | void ovl_set_flag(unsigned long flag, struct inode *inode); |
227 | bool ovl_test_flag(unsigned long flag, struct inode *inode); | |
ad0af710 AG |
228 | bool ovl_inuse_trylock(struct dentry *dentry); |
229 | void ovl_inuse_unlock(struct dentry *dentry); | |
f3a15685 AG |
230 | |
231 | static inline bool ovl_is_impuredir(struct dentry *dentry) | |
232 | { | |
233 | return ovl_check_dir_xattr(dentry, OVL_XATTR_IMPURE); | |
234 | } | |
235 | ||
e9be9d5e | 236 | |
bbb1e54d | 237 | /* namei.c */ |
8b88a2e6 | 238 | int ovl_verify_origin(struct dentry *dentry, struct vfsmount *mnt, |
54fb347e | 239 | struct dentry *origin, bool is_upper, bool set); |
415543d5 AG |
240 | int ovl_verify_index(struct dentry *index, struct path *lowerstack, |
241 | unsigned int numlower); | |
359f392c | 242 | int ovl_get_index_name(struct dentry *origin, struct qstr *name); |
bbb1e54d MS |
243 | int ovl_path_next(int idx, struct dentry *dentry, struct path *path); |
244 | struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags); | |
245 | bool ovl_lower_positive(struct dentry *dentry); | |
e9be9d5e MS |
246 | |
247 | /* readdir.c */ | |
248 | extern const struct file_operations ovl_dir_operations; | |
249 | int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); | |
250 | void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); | |
251 | void ovl_cache_free(struct list_head *list); | |
45aebeaf | 252 | int ovl_check_d_type_supported(struct path *realpath); |
eea2fb48 MS |
253 | void ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt, |
254 | struct dentry *dentry, int level); | |
415543d5 AG |
255 | int ovl_indexdir_cleanup(struct dentry *dentry, struct vfsmount *mnt, |
256 | struct path *lowerstack, unsigned int numlower); | |
e9be9d5e MS |
257 | |
258 | /* inode.c */ | |
259 | int ovl_setattr(struct dentry *dentry, struct iattr *attr); | |
5b712091 MS |
260 | int ovl_getattr(const struct path *path, struct kstat *stat, |
261 | u32 request_mask, unsigned int flags); | |
e9be9d5e | 262 | int ovl_permission(struct inode *inode, int mask); |
0e585ccc AG |
263 | int ovl_xattr_set(struct dentry *dentry, const char *name, const void *value, |
264 | size_t size, int flags); | |
0eb45fc3 AG |
265 | int ovl_xattr_get(struct dentry *dentry, const char *name, |
266 | void *value, size_t size); | |
e9be9d5e | 267 | ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); |
39a25b2b | 268 | struct posix_acl *ovl_get_acl(struct inode *inode, int type); |
2d902671 | 269 | int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags); |
d719e8f2 | 270 | int ovl_update_time(struct inode *inode, struct timespec *ts, int flags); |
0956254a | 271 | bool ovl_is_private_xattr(const char *name); |
e9be9d5e | 272 | |
ca4c8a3a | 273 | struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); |
09d8b586 | 274 | struct inode *ovl_get_inode(struct dentry *dentry, struct dentry *upperdentry); |
e9be9d5e MS |
275 | static inline void ovl_copyattr(struct inode *from, struct inode *to) |
276 | { | |
277 | to->i_uid = from->i_uid; | |
278 | to->i_gid = from->i_gid; | |
07a2daab | 279 | to->i_mode = from->i_mode; |
d719e8f2 MS |
280 | to->i_atime = from->i_atime; |
281 | to->i_mtime = from->i_mtime; | |
282 | to->i_ctime = from->i_ctime; | |
e9be9d5e MS |
283 | } |
284 | ||
285 | /* dir.c */ | |
286 | extern const struct inode_operations ovl_dir_inode_operations; | |
3d27573c | 287 | struct dentry *ovl_lookup_temp(struct dentry *workdir); |
32a3d848 AV |
288 | struct cattr { |
289 | dev_t rdev; | |
290 | umode_t mode; | |
291 | const char *link; | |
292 | }; | |
e9be9d5e | 293 | int ovl_create_real(struct inode *dir, struct dentry *newdentry, |
32a3d848 | 294 | struct cattr *attr, |
e9be9d5e | 295 | struct dentry *hardlink, bool debug); |
415543d5 | 296 | int ovl_cleanup(struct inode *dir, struct dentry *dentry); |
e9be9d5e MS |
297 | |
298 | /* copy_up.c */ | |
299 | int ovl_copy_up(struct dentry *dentry); | |
9aba6521 | 300 | int ovl_copy_up_flags(struct dentry *dentry, int flags); |
e9be9d5e MS |
301 | int ovl_copy_xattr(struct dentry *old, struct dentry *new); |
302 | int ovl_set_attr(struct dentry *upper, struct kstat *stat); | |
54fb347e | 303 | struct ovl_fh *ovl_encode_fh(struct dentry *lower, bool is_upper); |