Commit | Line | Data |
---|---|---|
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> |
ee023c30 | 12 | #include "ovl_entry.h" |
e9be9d5e | 13 | |
e9be9d5e | 14 | enum ovl_path_type { |
38e813db MS |
15 | __OVL_PATH_UPPER = (1 << 0), |
16 | __OVL_PATH_MERGE = (1 << 1), | |
59548503 | 17 | __OVL_PATH_ORIGIN = (1 << 2), |
e9be9d5e MS |
18 | }; |
19 | ||
1afaba1e MS |
20 | #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) |
21 | #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) | |
59548503 | 22 | #define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN) |
d837a49b | 23 | |
fe2b7595 AG |
24 | #define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay." |
25 | #define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque" | |
02b69b28 | 26 | #define OVL_XATTR_REDIRECT OVL_XATTR_PREFIX "redirect" |
3a1e819b | 27 | #define OVL_XATTR_ORIGIN OVL_XATTR_PREFIX "origin" |
ee1d6d37 | 28 | #define OVL_XATTR_IMPURE OVL_XATTR_PREFIX "impure" |
5f8415d6 | 29 | #define OVL_XATTR_NLINK OVL_XATTR_PREFIX "nlink" |
3a1e819b | 30 | |
13c72075 | 31 | enum ovl_flag { |
b79e05aa | 32 | /* Pure upper dir that may contain non pure upper entries */ |
13c72075 | 33 | OVL_IMPURE, |
b79e05aa AG |
34 | /* Non-merge dir that may contain whiteout entries */ |
35 | OVL_WHITEOUTS, | |
359f392c | 36 | OVL_INDEX, |
13c72075 MS |
37 | }; |
38 | ||
3a1e819b AG |
39 | /* |
40 | * The tuple (fh,uuid) is a universal unique identifier for a copy up origin, | |
41 | * where: | |
42 | * origin.fh - exported file handle of the lower file | |
43 | * origin.uuid - uuid of the lower filesystem | |
44 | */ | |
45 | #define OVL_FH_VERSION 0 | |
46 | #define OVL_FH_MAGIC 0xfb | |
47 | ||
48 | /* CPU byte order required for fid decoding: */ | |
49 | #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) | |
50 | #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) | |
54fb347e AG |
51 | /* Is the real inode encoded in fid an upper inode? */ |
52 | #define OVL_FH_FLAG_PATH_UPPER (1 << 2) | |
3a1e819b | 53 | |
961af647 AG |
54 | #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \ |
55 | OVL_FH_FLAG_PATH_UPPER) | |
3a1e819b AG |
56 | |
57 | #if defined(__LITTLE_ENDIAN) | |
58 | #define OVL_FH_FLAG_CPU_ENDIAN 0 | |
59 | #elif defined(__BIG_ENDIAN) | |
60 | #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN | |
61 | #else | |
62 | #error Endianness not defined | |
63 | #endif | |
64 | ||
65 | /* On-disk and in-memeory format for redirect by file handle */ | |
66 | struct ovl_fh { | |
67 | u8 version; /* 0 */ | |
68 | u8 magic; /* 0xfb */ | |
69 | u8 len; /* size of this header + size of fid */ | |
70 | u8 flags; /* OVL_FH_FLAG_* */ | |
71 | u8 type; /* fid_type of fid */ | |
01633fd2 | 72 | uuid_t uuid; /* uuid of filesystem */ |
3a1e819b AG |
73 | u8 fid[0]; /* file identifier */ |
74 | } __packed; | |
e9be9d5e MS |
75 | |
76 | static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry) | |
77 | { | |
78 | int err = vfs_rmdir(dir, dentry); | |
79 | pr_debug("rmdir(%pd2) = %i\n", dentry, err); | |
80 | return err; | |
81 | } | |
82 | ||
83 | static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry) | |
84 | { | |
85 | int err = vfs_unlink(dir, dentry, NULL); | |
86 | pr_debug("unlink(%pd2) = %i\n", dentry, err); | |
87 | return err; | |
88 | } | |
89 | ||
90 | static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir, | |
91 | struct dentry *new_dentry, bool debug) | |
92 | { | |
93 | int err = vfs_link(old_dentry, dir, new_dentry, NULL); | |
94 | if (debug) { | |
95 | pr_debug("link(%pd2, %pd2) = %i\n", | |
96 | old_dentry, new_dentry, err); | |
97 | } | |
98 | return err; | |
99 | } | |
100 | ||
101 | static inline int ovl_do_create(struct inode *dir, struct dentry *dentry, | |
102 | umode_t mode, bool debug) | |
103 | { | |
104 | int err = vfs_create(dir, dentry, mode, true); | |
105 | if (debug) | |
106 | pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); | |
107 | return err; | |
108 | } | |
109 | ||
110 | static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry, | |
111 | umode_t mode, bool debug) | |
112 | { | |
113 | int err = vfs_mkdir(dir, dentry, mode); | |
114 | if (debug) | |
115 | pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); | |
116 | return err; | |
117 | } | |
118 | ||
119 | static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry, | |
120 | umode_t mode, dev_t dev, bool debug) | |
121 | { | |
122 | int err = vfs_mknod(dir, dentry, mode, dev); | |
123 | if (debug) { | |
124 | pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", | |
125 | dentry, mode, dev, err); | |
126 | } | |
127 | return err; | |
128 | } | |
129 | ||
130 | static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry, | |
131 | const char *oldname, bool debug) | |
132 | { | |
133 | int err = vfs_symlink(dir, dentry, oldname); | |
134 | if (debug) | |
135 | pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); | |
136 | return err; | |
137 | } | |
138 | ||
139 | static inline int ovl_do_setxattr(struct dentry *dentry, const char *name, | |
140 | const void *value, size_t size, int flags) | |
141 | { | |
142 | int err = vfs_setxattr(dentry, name, value, size, flags); | |
143 | pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n", | |
144 | dentry, name, (int) size, (char *) value, flags, err); | |
145 | return err; | |
146 | } | |
147 | ||
148 | static inline int ovl_do_removexattr(struct dentry *dentry, const char *name) | |
149 | { | |
150 | int err = vfs_removexattr(dentry, name); | |
151 | pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); | |
152 | return err; | |
153 | } | |
154 | ||
155 | static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry, | |
156 | struct inode *newdir, struct dentry *newdentry, | |
157 | unsigned int flags) | |
158 | { | |
159 | int err; | |
160 | ||
2773bf00 | 161 | pr_debug("rename(%pd2, %pd2, 0x%x)\n", |
e9be9d5e MS |
162 | olddentry, newdentry, flags); |
163 | ||
164 | err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags); | |
165 | ||
166 | if (err) { | |
2773bf00 | 167 | pr_debug("...rename(%pd2, %pd2, ...) = %i\n", |
e9be9d5e MS |
168 | olddentry, newdentry, err); |
169 | } | |
170 | return err; | |
171 | } | |
172 | ||
173 | static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry) | |
174 | { | |
175 | int err = vfs_whiteout(dir, dentry); | |
176 | pr_debug("whiteout(%pd2) = %i\n", dentry, err); | |
177 | return err; | |
178 | } | |
179 | ||
e7f52429 AG |
180 | static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode) |
181 | { | |
182 | struct dentry *ret = vfs_tmpfile(dentry, mode, 0); | |
7879cb43 | 183 | int err = PTR_ERR_OR_ZERO(ret); |
e7f52429 AG |
184 | |
185 | pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); | |
186 | return ret; | |
187 | } | |
188 | ||
bbb1e54d MS |
189 | /* util.c */ |
190 | int ovl_want_write(struct dentry *dentry); | |
191 | void ovl_drop_write(struct dentry *dentry); | |
192 | struct dentry *ovl_workdir(struct dentry *dentry); | |
193 | const struct cred *ovl_override_creds(struct super_block *sb); | |
7bcd74b9 | 194 | struct super_block *ovl_same_sb(struct super_block *sb); |
02bcd157 AG |
195 | bool ovl_can_decode_fh(struct super_block *sb); |
196 | struct dentry *ovl_indexdir(struct super_block *sb); | |
bbb1e54d MS |
197 | struct ovl_entry *ovl_alloc_entry(unsigned int numlower); |
198 | bool ovl_dentry_remote(struct dentry *dentry); | |
199 | bool ovl_dentry_weird(struct dentry *dentry); | |
e9be9d5e | 200 | enum ovl_path_type ovl_path_type(struct dentry *dentry); |
e9be9d5e MS |
201 | void ovl_path_upper(struct dentry *dentry, struct path *path); |
202 | void ovl_path_lower(struct dentry *dentry, struct path *path); | |
203 | enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); | |
204 | struct dentry *ovl_dentry_upper(struct dentry *dentry); | |
205 | struct dentry *ovl_dentry_lower(struct dentry *dentry); | |
206 | struct dentry *ovl_dentry_real(struct dentry *dentry); | |
1d88f183 | 207 | struct dentry *ovl_i_dentry_upper(struct inode *inode); |
09d8b586 MS |
208 | struct inode *ovl_inode_upper(struct inode *inode); |
209 | struct inode *ovl_inode_lower(struct inode *inode); | |
210 | struct inode *ovl_inode_real(struct inode *inode); | |
4edb83bb MS |
211 | struct ovl_dir_cache *ovl_dir_cache(struct inode *inode); |
212 | void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache); | |
e9be9d5e | 213 | bool ovl_dentry_is_opaque(struct dentry *dentry); |
c412ce49 | 214 | bool ovl_dentry_is_whiteout(struct dentry *dentry); |
5cf5b477 | 215 | void ovl_dentry_set_opaque(struct dentry *dentry); |
55acc661 MS |
216 | bool ovl_dentry_has_upper_alias(struct dentry *dentry); |
217 | void ovl_dentry_set_upper_alias(struct dentry *dentry); | |
a6c60655 | 218 | bool ovl_redirect_dir(struct super_block *sb); |
a6c60655 MS |
219 | const char *ovl_dentry_get_redirect(struct dentry *dentry); |
220 | void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); | |
09d8b586 MS |
221 | void ovl_inode_init(struct inode *inode, struct dentry *upperdentry, |
222 | struct dentry *lowerdentry); | |
223 | void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); | |
4edb83bb | 224 | void ovl_dentry_version_inc(struct dentry *dentry, bool impurity); |
bbb1e54d MS |
225 | u64 ovl_dentry_version_get(struct dentry *dentry); |
226 | bool ovl_is_whiteout(struct dentry *dentry); | |
e9be9d5e | 227 | struct file *ovl_path_open(struct path *path, int flags); |
39d3d60a AG |
228 | int ovl_copy_up_start(struct dentry *dentry); |
229 | void ovl_copy_up_end(struct dentry *dentry); | |
b79e05aa | 230 | bool ovl_check_origin_xattr(struct dentry *dentry); |
f3a15685 AG |
231 | bool ovl_check_dir_xattr(struct dentry *dentry, const char *name); |
232 | int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry, | |
233 | const char *name, const void *value, size_t size, | |
234 | int xerr); | |
235 | int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); | |
13c72075 | 236 | void ovl_set_flag(unsigned long flag, struct inode *inode); |
4edb83bb | 237 | void ovl_clear_flag(unsigned long flag, struct inode *inode); |
13c72075 | 238 | bool ovl_test_flag(unsigned long flag, struct inode *inode); |
ad0af710 AG |
239 | bool ovl_inuse_trylock(struct dentry *dentry); |
240 | void ovl_inuse_unlock(struct dentry *dentry); | |
5f8415d6 AG |
241 | int ovl_nlink_start(struct dentry *dentry, bool *locked); |
242 | void ovl_nlink_end(struct dentry *dentry, bool locked); | |
5820dc08 | 243 | int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); |
f3a15685 AG |
244 | |
245 | static inline bool ovl_is_impuredir(struct dentry *dentry) | |
246 | { | |
247 | return ovl_check_dir_xattr(dentry, OVL_XATTR_IMPURE); | |
248 | } | |
249 | ||
e9be9d5e | 250 | |
bbb1e54d | 251 | /* namei.c */ |
d9768076 AG |
252 | int ovl_verify_origin(struct dentry *dentry, struct dentry *origin, |
253 | bool is_upper, bool set); | |
b9343632 | 254 | int ovl_verify_index(struct dentry *index, struct ovl_path *lower, |
415543d5 | 255 | unsigned int numlower); |
359f392c | 256 | int ovl_get_index_name(struct dentry *origin, struct qstr *name); |
bbb1e54d MS |
257 | int ovl_path_next(int idx, struct dentry *dentry, struct path *path); |
258 | struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags); | |
259 | bool ovl_lower_positive(struct dentry *dentry); | |
e9be9d5e MS |
260 | |
261 | /* readdir.c */ | |
262 | extern const struct file_operations ovl_dir_operations; | |
263 | int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); | |
264 | void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); | |
265 | void ovl_cache_free(struct list_head *list); | |
4edb83bb | 266 | void ovl_dir_cache_free(struct inode *inode); |
45aebeaf | 267 | int ovl_check_d_type_supported(struct path *realpath); |
eea2fb48 MS |
268 | void ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt, |
269 | struct dentry *dentry, int level); | |
415543d5 | 270 | int ovl_indexdir_cleanup(struct dentry *dentry, struct vfsmount *mnt, |
b9343632 | 271 | struct ovl_path *lower, unsigned int numlower); |
e9be9d5e MS |
272 | |
273 | /* inode.c */ | |
5f8415d6 AG |
274 | int ovl_set_nlink_upper(struct dentry *dentry); |
275 | int ovl_set_nlink_lower(struct dentry *dentry); | |
caf70cb2 AG |
276 | unsigned int ovl_get_nlink(struct dentry *lowerdentry, |
277 | struct dentry *upperdentry, | |
278 | unsigned int fallback); | |
e9be9d5e | 279 | int ovl_setattr(struct dentry *dentry, struct iattr *attr); |
5b712091 MS |
280 | int ovl_getattr(const struct path *path, struct kstat *stat, |
281 | u32 request_mask, unsigned int flags); | |
e9be9d5e | 282 | int ovl_permission(struct inode *inode, int mask); |
1d88f183 MS |
283 | int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name, |
284 | const void *value, size_t size, int flags); | |
285 | int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name, | |
0eb45fc3 | 286 | void *value, size_t size); |
e9be9d5e | 287 | ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); |
39a25b2b | 288 | struct posix_acl *ovl_get_acl(struct inode *inode, int type); |
2d902671 | 289 | int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags); |
d719e8f2 | 290 | int ovl_update_time(struct inode *inode, struct timespec *ts, int flags); |
0956254a | 291 | bool ovl_is_private_xattr(const char *name); |
e9be9d5e | 292 | |
ca4c8a3a | 293 | struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); |
6eaf0111 AG |
294 | struct inode *ovl_get_inode(struct dentry *dentry, struct dentry *upperdentry, |
295 | struct dentry *index); | |
e9be9d5e MS |
296 | static inline void ovl_copyattr(struct inode *from, struct inode *to) |
297 | { | |
298 | to->i_uid = from->i_uid; | |
299 | to->i_gid = from->i_gid; | |
07a2daab | 300 | to->i_mode = from->i_mode; |
d719e8f2 MS |
301 | to->i_atime = from->i_atime; |
302 | to->i_mtime = from->i_mtime; | |
303 | to->i_ctime = from->i_ctime; | |
e9be9d5e MS |
304 | } |
305 | ||
306 | /* dir.c */ | |
307 | extern const struct inode_operations ovl_dir_inode_operations; | |
3d27573c | 308 | struct dentry *ovl_lookup_temp(struct dentry *workdir); |
32a3d848 AV |
309 | struct cattr { |
310 | dev_t rdev; | |
311 | umode_t mode; | |
312 | const char *link; | |
313 | }; | |
e9be9d5e | 314 | int ovl_create_real(struct inode *dir, struct dentry *newdentry, |
32a3d848 | 315 | struct cattr *attr, |
e9be9d5e | 316 | struct dentry *hardlink, bool debug); |
415543d5 | 317 | int ovl_cleanup(struct inode *dir, struct dentry *dentry); |
e9be9d5e MS |
318 | |
319 | /* copy_up.c */ | |
320 | int ovl_copy_up(struct dentry *dentry); | |
9aba6521 | 321 | int ovl_copy_up_flags(struct dentry *dentry, int flags); |
e9be9d5e MS |
322 | int ovl_copy_xattr(struct dentry *old, struct dentry *new); |
323 | int ovl_set_attr(struct dentry *upper, struct kstat *stat); | |
54fb347e | 324 | struct ovl_fh *ovl_encode_fh(struct dentry *lower, bool is_upper); |
9678e630 AG |
325 | int ovl_set_origin(struct dentry *dentry, struct dentry *lower, |
326 | struct dentry *upper); |