Commit | Line | Data |
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d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
e9be9d5e MS |
2 | /* |
3 | * | |
4 | * Copyright (C) 2011 Novell Inc. | |
e9be9d5e MS |
5 | */ |
6 | ||
7 | #include <linux/kernel.h> | |
3a1e819b | 8 | #include <linux/uuid.h> |
46e5d0a3 | 9 | #include <linux/fs.h> |
22f289ce | 10 | #include <linux/namei.h> |
0e641857 CB |
11 | #include <linux/posix_acl.h> |
12 | #include <linux/posix_acl_xattr.h> | |
ee023c30 | 13 | #include "ovl_entry.h" |
e9be9d5e | 14 | |
1bd0a3ae | 15 | #undef pr_fmt |
16 | #define pr_fmt(fmt) "overlayfs: " fmt | |
17 | ||
e9be9d5e | 18 | enum ovl_path_type { |
38e813db MS |
19 | __OVL_PATH_UPPER = (1 << 0), |
20 | __OVL_PATH_MERGE = (1 << 1), | |
59548503 | 21 | __OVL_PATH_ORIGIN = (1 << 2), |
e9be9d5e MS |
22 | }; |
23 | ||
1afaba1e MS |
24 | #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) |
25 | #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) | |
59548503 | 26 | #define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN) |
d837a49b | 27 | |
2d2f2d73 MS |
28 | #define OVL_XATTR_NAMESPACE "overlay." |
29 | #define OVL_XATTR_TRUSTED_PREFIX XATTR_TRUSTED_PREFIX OVL_XATTR_NAMESPACE | |
30 | #define OVL_XATTR_USER_PREFIX XATTR_USER_PREFIX OVL_XATTR_NAMESPACE | |
43d193f8 MS |
31 | |
32 | enum ovl_xattr { | |
33 | OVL_XATTR_OPAQUE, | |
34 | OVL_XATTR_REDIRECT, | |
35 | OVL_XATTR_ORIGIN, | |
36 | OVL_XATTR_IMPURE, | |
37 | OVL_XATTR_NLINK, | |
38 | OVL_XATTR_UPPER, | |
39 | OVL_XATTR_METACOPY, | |
096a218a | 40 | OVL_XATTR_PROTATTR, |
43d193f8 | 41 | }; |
3a1e819b | 42 | |
c62520a8 | 43 | enum ovl_inode_flag { |
b79e05aa | 44 | /* Pure upper dir that may contain non pure upper entries */ |
13c72075 | 45 | OVL_IMPURE, |
b79e05aa AG |
46 | /* Non-merge dir that may contain whiteout entries */ |
47 | OVL_WHITEOUTS, | |
359f392c | 48 | OVL_INDEX, |
0c288874 | 49 | OVL_UPPERDATA, |
a00c2d59 VG |
50 | /* Inode number will remain constant over copy up. */ |
51 | OVL_CONST_INO, | |
13c72075 MS |
52 | }; |
53 | ||
c62520a8 AG |
54 | enum ovl_entry_flag { |
55 | OVL_E_UPPER_ALIAS, | |
56 | OVL_E_OPAQUE, | |
2ca3c148 | 57 | OVL_E_CONNECTED, |
c62520a8 AG |
58 | }; |
59 | ||
926e94d7 AG |
60 | enum { |
61 | OVL_XINO_OFF, | |
62 | OVL_XINO_AUTO, | |
63 | OVL_XINO_ON, | |
64 | }; | |
65 | ||
3a1e819b AG |
66 | /* |
67 | * The tuple (fh,uuid) is a universal unique identifier for a copy up origin, | |
68 | * where: | |
69 | * origin.fh - exported file handle of the lower file | |
70 | * origin.uuid - uuid of the lower filesystem | |
71 | */ | |
72 | #define OVL_FH_VERSION 0 | |
73 | #define OVL_FH_MAGIC 0xfb | |
74 | ||
75 | /* CPU byte order required for fid decoding: */ | |
76 | #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) | |
77 | #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) | |
54fb347e AG |
78 | /* Is the real inode encoded in fid an upper inode? */ |
79 | #define OVL_FH_FLAG_PATH_UPPER (1 << 2) | |
3a1e819b | 80 | |
961af647 AG |
81 | #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \ |
82 | OVL_FH_FLAG_PATH_UPPER) | |
3a1e819b AG |
83 | |
84 | #if defined(__LITTLE_ENDIAN) | |
85 | #define OVL_FH_FLAG_CPU_ENDIAN 0 | |
86 | #elif defined(__BIG_ENDIAN) | |
87 | #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN | |
88 | #else | |
89 | #error Endianness not defined | |
90 | #endif | |
91 | ||
cbe7fba8 AG |
92 | /* The type used to be returned by overlay exportfs for misaligned fid */ |
93 | #define OVL_FILEID_V0 0xfb | |
94 | /* The type returned by overlay exportfs for 32bit aligned fid */ | |
95 | #define OVL_FILEID_V1 0xf8 | |
8ed5eec9 | 96 | |
cbe7fba8 AG |
97 | /* On-disk format for "origin" file handle */ |
98 | struct ovl_fb { | |
3a1e819b AG |
99 | u8 version; /* 0 */ |
100 | u8 magic; /* 0xfb */ | |
101 | u8 len; /* size of this header + size of fid */ | |
102 | u8 flags; /* OVL_FH_FLAG_* */ | |
103 | u8 type; /* fid_type of fid */ | |
01633fd2 | 104 | uuid_t uuid; /* uuid of filesystem */ |
0efbe7c4 | 105 | u32 fid[]; /* file identifier should be 32bit aligned in-memory */ |
3a1e819b | 106 | } __packed; |
e9be9d5e | 107 | |
cbe7fba8 AG |
108 | /* In-memory and on-wire format for overlay file handle */ |
109 | struct ovl_fh { | |
110 | u8 padding[3]; /* make sure fb.fid is 32bit aligned */ | |
111 | union { | |
112 | struct ovl_fb fb; | |
113 | u8 buf[0]; | |
114 | }; | |
115 | } __packed; | |
116 | ||
117 | #define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb) | |
118 | #define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len) | |
119 | #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \ | |
120 | offsetof(struct ovl_fb, fid)) | |
121 | ||
2d2f2d73 | 122 | extern const char *const ovl_xattr_table[][2]; |
43d193f8 MS |
123 | static inline const char *ovl_xattr(struct ovl_fs *ofs, enum ovl_xattr ox) |
124 | { | |
2d2f2d73 | 125 | return ovl_xattr_table[ox][ofs->config.userxattr]; |
43d193f8 MS |
126 | } |
127 | ||
a15506ea CB |
128 | /* |
129 | * When changing ownership of an upper object map the intended ownership | |
130 | * according to the upper layer's idmapping. When an upper mount idmaps files | |
131 | * that are stored on-disk as owned by id 1001 to id 1000 this means stat on | |
132 | * this object will report it as being owned by id 1000 when calling stat via | |
133 | * the upper mount. | |
134 | * In order to change ownership of an object so stat reports id 1000 when | |
135 | * called on an idmapped upper mount the value written to disk - i.e., the | |
136 | * value stored in ia_*id - must 1001. The mount mapping helper will thus take | |
137 | * care to map 1000 to 1001. | |
138 | * The mnt idmapping helpers are nops if the upper layer isn't idmapped. | |
139 | */ | |
140 | static inline int ovl_do_notify_change(struct ovl_fs *ofs, | |
141 | struct dentry *upperdentry, | |
142 | struct iattr *attr) | |
143 | { | |
b27c82e1 | 144 | return notify_change(ovl_upper_mnt_userns(ofs), upperdentry, attr, NULL); |
a15506ea CB |
145 | } |
146 | ||
576bb263 CB |
147 | static inline int ovl_do_rmdir(struct ovl_fs *ofs, |
148 | struct inode *dir, struct dentry *dentry) | |
e9be9d5e | 149 | { |
c67cf654 | 150 | int err = vfs_rmdir(ovl_upper_mnt_userns(ofs), dir, dentry); |
6cf00764 | 151 | |
e9be9d5e MS |
152 | pr_debug("rmdir(%pd2) = %i\n", dentry, err); |
153 | return err; | |
154 | } | |
155 | ||
576bb263 CB |
156 | static inline int ovl_do_unlink(struct ovl_fs *ofs, struct inode *dir, |
157 | struct dentry *dentry) | |
e9be9d5e | 158 | { |
c67cf654 | 159 | int err = vfs_unlink(ovl_upper_mnt_userns(ofs), dir, dentry, NULL); |
6cf00764 | 160 | |
e9be9d5e MS |
161 | pr_debug("unlink(%pd2) = %i\n", dentry, err); |
162 | return err; | |
163 | } | |
164 | ||
576bb263 CB |
165 | static inline int ovl_do_link(struct ovl_fs *ofs, struct dentry *old_dentry, |
166 | struct inode *dir, struct dentry *new_dentry) | |
e9be9d5e | 167 | { |
c67cf654 | 168 | int err = vfs_link(old_dentry, ovl_upper_mnt_userns(ofs), dir, new_dentry, NULL); |
6cf00764 AG |
169 | |
170 | pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err); | |
e9be9d5e MS |
171 | return err; |
172 | } | |
173 | ||
576bb263 CB |
174 | static inline int ovl_do_create(struct ovl_fs *ofs, |
175 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 176 | umode_t mode) |
e9be9d5e | 177 | { |
c67cf654 | 178 | int err = vfs_create(ovl_upper_mnt_userns(ofs), dir, dentry, mode, true); |
6cf00764 AG |
179 | |
180 | pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); | |
e9be9d5e MS |
181 | return err; |
182 | } | |
183 | ||
576bb263 CB |
184 | static inline int ovl_do_mkdir(struct ovl_fs *ofs, |
185 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 186 | umode_t mode) |
e9be9d5e | 187 | { |
c67cf654 | 188 | int err = vfs_mkdir(ovl_upper_mnt_userns(ofs), dir, dentry, mode); |
6cf00764 | 189 | pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); |
e9be9d5e MS |
190 | return err; |
191 | } | |
192 | ||
576bb263 CB |
193 | static inline int ovl_do_mknod(struct ovl_fs *ofs, |
194 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 195 | umode_t mode, dev_t dev) |
e9be9d5e | 196 | { |
c67cf654 | 197 | int err = vfs_mknod(ovl_upper_mnt_userns(ofs), dir, dentry, mode, dev); |
6cf00764 AG |
198 | |
199 | pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err); | |
e9be9d5e MS |
200 | return err; |
201 | } | |
202 | ||
576bb263 CB |
203 | static inline int ovl_do_symlink(struct ovl_fs *ofs, |
204 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 205 | const char *oldname) |
e9be9d5e | 206 | { |
c67cf654 | 207 | int err = vfs_symlink(ovl_upper_mnt_userns(ofs), dir, dentry, oldname); |
6cf00764 AG |
208 | |
209 | pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); | |
e9be9d5e MS |
210 | return err; |
211 | } | |
212 | ||
2d343087 | 213 | static inline ssize_t ovl_do_getxattr(const struct path *path, const char *name, |
dad7017a | 214 | void *value, size_t size) |
d5dc7486 | 215 | { |
dad7017a CB |
216 | int err, len; |
217 | ||
218 | WARN_ON(path->dentry->d_sb != path->mnt->mnt_sb); | |
219 | ||
220 | err = vfs_getxattr(mnt_user_ns(path->mnt), path->dentry, | |
221 | name, value, size); | |
222 | len = (value && err > 0) ? err : 0; | |
5e717c6f AG |
223 | |
224 | pr_debug("getxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n", | |
dad7017a | 225 | path->dentry, name, min(len, 48), value, size, err); |
5e717c6f | 226 | return err; |
d5dc7486 MS |
227 | } |
228 | ||
dad7017a CB |
229 | static inline ssize_t ovl_getxattr_upper(struct ovl_fs *ofs, |
230 | struct dentry *upperdentry, | |
231 | enum ovl_xattr ox, void *value, | |
232 | size_t size) | |
233 | { | |
234 | struct path upperpath = { | |
235 | .dentry = upperdentry, | |
236 | .mnt = ovl_upper_mnt(ofs), | |
237 | }; | |
238 | ||
239 | return ovl_do_getxattr(&upperpath, ovl_xattr(ofs, ox), value, size); | |
240 | } | |
241 | ||
242 | static inline ssize_t ovl_path_getxattr(struct ovl_fs *ofs, | |
2d343087 | 243 | const struct path *path, |
dad7017a CB |
244 | enum ovl_xattr ox, void *value, |
245 | size_t size) | |
c914c0e2 | 246 | { |
dad7017a | 247 | return ovl_do_getxattr(path, ovl_xattr(ofs, ox), value, size); |
c914c0e2 AG |
248 | } |
249 | ||
610afc0b | 250 | static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry, |
c914c0e2 AG |
251 | const char *name, const void *value, |
252 | size_t size, int flags) | |
e9be9d5e | 253 | { |
0c5fd887 | 254 | int err = vfs_setxattr(ovl_upper_mnt_userns(ofs), dentry, name, |
6344e669 | 255 | value, size, flags); |
c914c0e2 AG |
256 | |
257 | pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, %d) = %i\n", | |
258 | dentry, name, min((int)size, 48), value, size, flags, err); | |
e9be9d5e MS |
259 | return err; |
260 | } | |
261 | ||
c914c0e2 AG |
262 | static inline int ovl_setxattr(struct ovl_fs *ofs, struct dentry *dentry, |
263 | enum ovl_xattr ox, const void *value, | |
264 | size_t size) | |
265 | { | |
266 | return ovl_do_setxattr(ofs, dentry, ovl_xattr(ofs, ox), value, size, 0); | |
267 | } | |
268 | ||
610afc0b | 269 | static inline int ovl_do_removexattr(struct ovl_fs *ofs, struct dentry *dentry, |
c914c0e2 | 270 | const char *name) |
e9be9d5e | 271 | { |
dad7017a | 272 | int err = vfs_removexattr(ovl_upper_mnt_userns(ofs), dentry, name); |
e9be9d5e MS |
273 | pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); |
274 | return err; | |
275 | } | |
276 | ||
c914c0e2 AG |
277 | static inline int ovl_removexattr(struct ovl_fs *ofs, struct dentry *dentry, |
278 | enum ovl_xattr ox) | |
279 | { | |
280 | return ovl_do_removexattr(ofs, dentry, ovl_xattr(ofs, ox)); | |
281 | } | |
282 | ||
0e641857 CB |
283 | static inline int ovl_do_set_acl(struct ovl_fs *ofs, struct dentry *dentry, |
284 | const char *acl_name, struct posix_acl *acl) | |
285 | { | |
286 | return vfs_set_acl(ovl_upper_mnt_userns(ofs), dentry, acl_name, acl); | |
287 | } | |
288 | ||
289 | static inline int ovl_do_remove_acl(struct ovl_fs *ofs, struct dentry *dentry, | |
290 | const char *acl_name) | |
291 | { | |
292 | return vfs_remove_acl(ovl_upper_mnt_userns(ofs), dentry, acl_name); | |
293 | } | |
294 | ||
576bb263 CB |
295 | static inline int ovl_do_rename(struct ovl_fs *ofs, struct inode *olddir, |
296 | struct dentry *olddentry, struct inode *newdir, | |
297 | struct dentry *newdentry, unsigned int flags) | |
e9be9d5e MS |
298 | { |
299 | int err; | |
9fe61450 | 300 | struct renamedata rd = { |
c67cf654 | 301 | .old_mnt_userns = ovl_upper_mnt_userns(ofs), |
9fe61450 CB |
302 | .old_dir = olddir, |
303 | .old_dentry = olddentry, | |
c67cf654 | 304 | .new_mnt_userns = ovl_upper_mnt_userns(ofs), |
9fe61450 CB |
305 | .new_dir = newdir, |
306 | .new_dentry = newdentry, | |
307 | .flags = flags, | |
308 | }; | |
e9be9d5e | 309 | |
6cf00764 | 310 | pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags); |
9fe61450 | 311 | err = vfs_rename(&rd); |
e9be9d5e | 312 | if (err) { |
2773bf00 | 313 | pr_debug("...rename(%pd2, %pd2, ...) = %i\n", |
e9be9d5e MS |
314 | olddentry, newdentry, err); |
315 | } | |
316 | return err; | |
317 | } | |
318 | ||
576bb263 CB |
319 | static inline int ovl_do_whiteout(struct ovl_fs *ofs, |
320 | struct inode *dir, struct dentry *dentry) | |
e9be9d5e | 321 | { |
c67cf654 | 322 | int err = vfs_whiteout(ovl_upper_mnt_userns(ofs), dir, dentry); |
e9be9d5e MS |
323 | pr_debug("whiteout(%pd2) = %i\n", dentry, err); |
324 | return err; | |
325 | } | |
326 | ||
2b1a7746 MS |
327 | static inline struct file *ovl_do_tmpfile(struct ovl_fs *ofs, |
328 | struct dentry *dentry, umode_t mode) | |
e7f52429 | 329 | { |
2b1a7746 MS |
330 | struct path path = { .mnt = ovl_upper_mnt(ofs), .dentry = dentry }; |
331 | struct file *file = vfs_tmpfile_open(ovl_upper_mnt_userns(ofs), &path, mode, | |
332 | O_LARGEFILE | O_WRONLY, current_cred()); | |
333 | int err = PTR_ERR_OR_ZERO(file); | |
e7f52429 AG |
334 | |
335 | pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); | |
2b1a7746 | 336 | return file; |
e7f52429 AG |
337 | } |
338 | ||
22f289ce CB |
339 | static inline struct dentry *ovl_lookup_upper(struct ovl_fs *ofs, |
340 | const char *name, | |
341 | struct dentry *base, int len) | |
342 | { | |
343 | return lookup_one(ovl_upper_mnt_userns(ofs), name, base, len); | |
344 | } | |
345 | ||
0c288874 VG |
346 | static inline bool ovl_open_flags_need_copy_up(int flags) |
347 | { | |
348 | if (!flags) | |
349 | return false; | |
350 | ||
351 | return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC)); | |
352 | } | |
353 | ||
ca45275c VY |
354 | static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs) |
355 | { | |
356 | /* | |
357 | * To avoid regressions in existing setups with overlay lower offline | |
358 | * changes, we allow lower changes only if none of the new features | |
359 | * are used. | |
360 | */ | |
361 | return (!ofs->config.index && !ofs->config.metacopy && | |
362 | !ofs->config.redirect_dir && ofs->config.xino != OVL_XINO_ON); | |
363 | } | |
364 | ||
365 | ||
bbb1e54d MS |
366 | /* util.c */ |
367 | int ovl_want_write(struct dentry *dentry); | |
368 | void ovl_drop_write(struct dentry *dentry); | |
369 | struct dentry *ovl_workdir(struct dentry *dentry); | |
370 | const struct cred *ovl_override_creds(struct super_block *sb); | |
e487d889 | 371 | int ovl_can_decode_fh(struct super_block *sb); |
02bcd157 | 372 | struct dentry *ovl_indexdir(struct super_block *sb); |
f168f109 AG |
373 | bool ovl_index_all(struct super_block *sb); |
374 | bool ovl_verify_lower(struct super_block *sb); | |
bbb1e54d MS |
375 | struct ovl_entry *ovl_alloc_entry(unsigned int numlower); |
376 | bool ovl_dentry_remote(struct dentry *dentry); | |
f4288844 MS |
377 | void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry, |
378 | unsigned int mask); | |
bbb1e54d | 379 | bool ovl_dentry_weird(struct dentry *dentry); |
e9be9d5e | 380 | enum ovl_path_type ovl_path_type(struct dentry *dentry); |
e9be9d5e MS |
381 | void ovl_path_upper(struct dentry *dentry, struct path *path); |
382 | void ovl_path_lower(struct dentry *dentry, struct path *path); | |
4f93b426 | 383 | void ovl_path_lowerdata(struct dentry *dentry, struct path *path); |
ffa5723c | 384 | void ovl_i_path_real(struct inode *inode, struct path *path); |
e9be9d5e | 385 | enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); |
1248ea4b | 386 | enum ovl_path_type ovl_path_realdata(struct dentry *dentry, struct path *path); |
e9be9d5e MS |
387 | struct dentry *ovl_dentry_upper(struct dentry *dentry); |
388 | struct dentry *ovl_dentry_lower(struct dentry *dentry); | |
647d253f | 389 | struct dentry *ovl_dentry_lowerdata(struct dentry *dentry); |
ffa5723c | 390 | const struct ovl_layer *ovl_i_layer_lower(struct inode *inode); |
13464165 | 391 | const struct ovl_layer *ovl_layer_lower(struct dentry *dentry); |
e9be9d5e | 392 | struct dentry *ovl_dentry_real(struct dentry *dentry); |
1d88f183 | 393 | struct dentry *ovl_i_dentry_upper(struct inode *inode); |
09d8b586 MS |
394 | struct inode *ovl_inode_upper(struct inode *inode); |
395 | struct inode *ovl_inode_lower(struct inode *inode); | |
2664bd08 | 396 | struct inode *ovl_inode_lowerdata(struct inode *inode); |
09d8b586 | 397 | struct inode *ovl_inode_real(struct inode *inode); |
4823d49c | 398 | struct inode *ovl_inode_realdata(struct inode *inode); |
4edb83bb MS |
399 | struct ovl_dir_cache *ovl_dir_cache(struct inode *inode); |
400 | void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache); | |
c62520a8 AG |
401 | void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry); |
402 | void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry); | |
403 | bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry); | |
e9be9d5e | 404 | bool ovl_dentry_is_opaque(struct dentry *dentry); |
c412ce49 | 405 | bool ovl_dentry_is_whiteout(struct dentry *dentry); |
5cf5b477 | 406 | void ovl_dentry_set_opaque(struct dentry *dentry); |
55acc661 MS |
407 | bool ovl_dentry_has_upper_alias(struct dentry *dentry); |
408 | void ovl_dentry_set_upper_alias(struct dentry *dentry); | |
0c288874 VG |
409 | bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags); |
410 | bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags); | |
411 | bool ovl_has_upperdata(struct inode *inode); | |
412 | void ovl_set_upperdata(struct inode *inode); | |
a6c60655 | 413 | bool ovl_redirect_dir(struct super_block *sb); |
a6c60655 MS |
414 | const char *ovl_dentry_get_redirect(struct dentry *dentry); |
415 | void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); | |
09d8b586 | 416 | void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); |
d9854c87 | 417 | void ovl_dir_modified(struct dentry *dentry, bool impurity); |
bbb1e54d MS |
418 | u64 ovl_dentry_version_get(struct dentry *dentry); |
419 | bool ovl_is_whiteout(struct dentry *dentry); | |
2d343087 | 420 | struct file *ovl_path_open(const struct path *path, int flags); |
0c288874 | 421 | int ovl_copy_up_start(struct dentry *dentry, int flags); |
39d3d60a | 422 | void ovl_copy_up_end(struct dentry *dentry); |
0c288874 | 423 | bool ovl_already_copied_up(struct dentry *dentry, int flags); |
2d343087 | 424 | bool ovl_path_check_dir_xattr(struct ovl_fs *ofs, const struct path *path, |
dad7017a | 425 | enum ovl_xattr ox); |
2d343087 | 426 | bool ovl_path_check_origin_xattr(struct ovl_fs *ofs, const struct path *path); |
dad7017a CB |
427 | |
428 | static inline bool ovl_check_origin_xattr(struct ovl_fs *ofs, | |
429 | struct dentry *upperdentry) | |
430 | { | |
431 | struct path upperpath = { | |
432 | .dentry = upperdentry, | |
433 | .mnt = ovl_upper_mnt(ofs), | |
434 | }; | |
435 | return ovl_path_check_origin_xattr(ofs, &upperpath); | |
436 | } | |
437 | ||
a0c236b1 | 438 | int ovl_check_setxattr(struct ovl_fs *ofs, struct dentry *upperdentry, |
43d193f8 | 439 | enum ovl_xattr ox, const void *value, size_t size, |
f3a15685 AG |
440 | int xerr); |
441 | int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); | |
ad0af710 AG |
442 | bool ovl_inuse_trylock(struct dentry *dentry); |
443 | void ovl_inuse_unlock(struct dentry *dentry); | |
146d62e5 | 444 | bool ovl_is_inuse(struct dentry *dentry); |
24b33ee1 | 445 | bool ovl_need_index(struct dentry *dentry); |
0e32992f AG |
446 | int ovl_nlink_start(struct dentry *dentry); |
447 | void ovl_nlink_end(struct dentry *dentry); | |
5820dc08 | 448 | int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); |
2d343087 | 449 | int ovl_check_metacopy_xattr(struct ovl_fs *ofs, const struct path *path); |
67d756c2 | 450 | bool ovl_is_metacopy_dentry(struct dentry *dentry); |
2d343087 | 451 | char *ovl_get_redirect_xattr(struct ovl_fs *ofs, const struct path *path, int padding); |
335d3fc5 | 452 | int ovl_sync_status(struct ovl_fs *ofs); |
f3a15685 | 453 | |
65cd913e AG |
454 | static inline void ovl_set_flag(unsigned long flag, struct inode *inode) |
455 | { | |
456 | set_bit(flag, &OVL_I(inode)->flags); | |
457 | } | |
458 | ||
459 | static inline void ovl_clear_flag(unsigned long flag, struct inode *inode) | |
460 | { | |
461 | clear_bit(flag, &OVL_I(inode)->flags); | |
462 | } | |
463 | ||
464 | static inline bool ovl_test_flag(unsigned long flag, struct inode *inode) | |
465 | { | |
466 | return test_bit(flag, &OVL_I(inode)->flags); | |
467 | } | |
468 | ||
610afc0b | 469 | static inline bool ovl_is_impuredir(struct super_block *sb, |
dad7017a | 470 | struct dentry *upperdentry) |
f3a15685 | 471 | { |
dad7017a CB |
472 | struct ovl_fs *ofs = OVL_FS(sb); |
473 | struct path upperpath = { | |
474 | .dentry = upperdentry, | |
475 | .mnt = ovl_upper_mnt(ofs), | |
476 | }; | |
477 | ||
478 | return ovl_path_check_dir_xattr(ofs, &upperpath, OVL_XATTR_IMPURE); | |
f3a15685 AG |
479 | } |
480 | ||
926e94d7 AG |
481 | /* |
482 | * With xino=auto, we do best effort to keep all inodes on same st_dev and | |
483 | * d_ino consistent with st_ino. | |
484 | * With xino=on, we do the same effort but we warn if we failed. | |
485 | */ | |
486 | static inline bool ovl_xino_warn(struct super_block *sb) | |
487 | { | |
488 | return OVL_FS(sb)->config.xino == OVL_XINO_ON; | |
489 | } | |
490 | ||
0f831ec8 AG |
491 | /* All layers on same fs? */ |
492 | static inline bool ovl_same_fs(struct super_block *sb) | |
e487d889 | 493 | { |
0f831ec8 AG |
494 | return OVL_FS(sb)->xino_mode == 0; |
495 | } | |
e487d889 | 496 | |
0f831ec8 AG |
497 | /* All overlay inodes have same st_dev? */ |
498 | static inline bool ovl_same_dev(struct super_block *sb) | |
499 | { | |
500 | return OVL_FS(sb)->xino_mode >= 0; | |
501 | } | |
502 | ||
503 | static inline unsigned int ovl_xino_bits(struct super_block *sb) | |
504 | { | |
505 | return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0; | |
e487d889 AG |
506 | } |
507 | ||
531d3040 AG |
508 | static inline void ovl_inode_lock(struct inode *inode) |
509 | { | |
510 | mutex_lock(&OVL_I(inode)->lock); | |
511 | } | |
512 | ||
513 | static inline int ovl_inode_lock_interruptible(struct inode *inode) | |
1e92e307 AG |
514 | { |
515 | return mutex_lock_interruptible(&OVL_I(inode)->lock); | |
516 | } | |
517 | ||
518 | static inline void ovl_inode_unlock(struct inode *inode) | |
519 | { | |
520 | mutex_unlock(&OVL_I(inode)->lock); | |
521 | } | |
522 | ||
e9be9d5e | 523 | |
bbb1e54d | 524 | /* namei.c */ |
cbe7fba8 AG |
525 | int ovl_check_fb_len(struct ovl_fb *fb, int fb_len); |
526 | ||
527 | static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len) | |
528 | { | |
522f6e6c AG |
529 | if (fh_len < sizeof(struct ovl_fh)) |
530 | return -EINVAL; | |
531 | ||
cbe7fba8 AG |
532 | return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET); |
533 | } | |
534 | ||
1cdb0cb6 PT |
535 | struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh, |
536 | struct vfsmount *mnt, bool connected); | |
8a22efa1 | 537 | int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, |
f941866f | 538 | struct dentry *upperdentry, struct ovl_path **stackp); |
610afc0b | 539 | int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry, |
43d193f8 | 540 | enum ovl_xattr ox, struct dentry *real, bool is_upper, |
610afc0b | 541 | bool set); |
3b0bfc6e | 542 | struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index); |
1eff1a1d | 543 | int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index); |
1cdb0cb6 PT |
544 | int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin, |
545 | struct qstr *name); | |
91ffe7be | 546 | struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh); |
06170154 AG |
547 | struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, |
548 | struct dentry *origin, bool verify); | |
bbb1e54d | 549 | int ovl_path_next(int idx, struct dentry *dentry, struct path *path); |
1eff1a1d AG |
550 | struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, |
551 | unsigned int flags); | |
bbb1e54d | 552 | bool ovl_lower_positive(struct dentry *dentry); |
e9be9d5e | 553 | |
610afc0b | 554 | static inline int ovl_verify_origin(struct ovl_fs *ofs, struct dentry *upper, |
05122443 AG |
555 | struct dentry *origin, bool set) |
556 | { | |
610afc0b MS |
557 | return ovl_verify_set_fh(ofs, upper, OVL_XATTR_ORIGIN, origin, |
558 | false, set); | |
05122443 AG |
559 | } |
560 | ||
610afc0b MS |
561 | static inline int ovl_verify_upper(struct ovl_fs *ofs, struct dentry *index, |
562 | struct dentry *upper, bool set) | |
ad1d615c | 563 | { |
610afc0b | 564 | return ovl_verify_set_fh(ofs, index, OVL_XATTR_UPPER, upper, true, set); |
ad1d615c AG |
565 | } |
566 | ||
e9be9d5e MS |
567 | /* readdir.c */ |
568 | extern const struct file_operations ovl_dir_operations; | |
61536bed | 569 | struct file *ovl_dir_real_file(const struct file *file, bool want_upper); |
e9be9d5e | 570 | int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); |
576bb263 CB |
571 | void ovl_cleanup_whiteouts(struct ovl_fs *ofs, struct dentry *upper, |
572 | struct list_head *list); | |
e9be9d5e | 573 | void ovl_cache_free(struct list_head *list); |
4edb83bb | 574 | void ovl_dir_cache_free(struct inode *inode); |
2d343087 | 575 | int ovl_check_d_type_supported(const struct path *realpath); |
576bb263 CB |
576 | int ovl_workdir_cleanup(struct ovl_fs *ofs, struct inode *dir, |
577 | struct vfsmount *mnt, struct dentry *dentry, int level); | |
1eff1a1d | 578 | int ovl_indexdir_cleanup(struct ovl_fs *ofs); |
e9be9d5e | 579 | |
65cd913e AG |
580 | /* |
581 | * Can we iterate real dir directly? | |
582 | * | |
583 | * Non-merge dir may contain whiteouts from a time it was a merge upper, before | |
584 | * lower dir was removed under it and possibly before it was rotated from upper | |
585 | * to lower layer. | |
586 | */ | |
587 | static inline bool ovl_dir_is_real(struct dentry *dir) | |
588 | { | |
589 | return !ovl_test_flag(OVL_WHITEOUTS, d_inode(dir)); | |
590 | } | |
591 | ||
e9be9d5e | 592 | /* inode.c */ |
5f8415d6 AG |
593 | int ovl_set_nlink_upper(struct dentry *dentry); |
594 | int ovl_set_nlink_lower(struct dentry *dentry); | |
610afc0b | 595 | unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry, |
caf70cb2 AG |
596 | struct dentry *upperdentry, |
597 | unsigned int fallback); | |
549c7297 CB |
598 | int ovl_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, |
599 | struct iattr *attr); | |
600 | int ovl_getattr(struct user_namespace *mnt_userns, const struct path *path, | |
601 | struct kstat *stat, u32 request_mask, unsigned int flags); | |
602 | int ovl_permission(struct user_namespace *mnt_userns, struct inode *inode, | |
603 | int mask); | |
1d88f183 MS |
604 | int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name, |
605 | const void *value, size_t size, int flags); | |
606 | int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name, | |
0eb45fc3 | 607 | void *value, size_t size); |
e9be9d5e | 608 | ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); |
ded53656 YX |
609 | |
610 | #ifdef CONFIG_FS_POSIX_ACL | |
6c0a8bfb CB |
611 | struct posix_acl *do_ovl_get_acl(struct user_namespace *mnt_userns, |
612 | struct inode *inode, int type, | |
613 | bool rcu, bool noperm); | |
614 | static inline struct posix_acl *ovl_get_inode_acl(struct inode *inode, int type, | |
615 | bool rcu) | |
616 | { | |
617 | return do_ovl_get_acl(&init_user_ns, inode, type, rcu, true); | |
618 | } | |
619 | static inline struct posix_acl *ovl_get_acl(struct user_namespace *mnt_userns, | |
620 | struct dentry *dentry, int type) | |
621 | { | |
622 | return do_ovl_get_acl(mnt_userns, d_inode(dentry), type, false, false); | |
623 | } | |
0e641857 CB |
624 | int ovl_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, |
625 | struct posix_acl *acl, int type); | |
ded53656 | 626 | #else |
6c0a8bfb CB |
627 | #define ovl_get_inode_acl NULL |
628 | #define ovl_get_acl NULL | |
0e641857 | 629 | #define ovl_set_acl NULL |
ded53656 YX |
630 | #endif |
631 | ||
95582b00 | 632 | int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags); |
610afc0b | 633 | bool ovl_is_private_xattr(struct super_block *sb, const char *name); |
e9be9d5e | 634 | |
ac6a52eb | 635 | struct ovl_inode_params { |
01b39dcc | 636 | struct inode *newinode; |
ac6a52eb VG |
637 | struct dentry *upperdentry; |
638 | struct ovl_path *lowerpath; | |
74c6e384 | 639 | bool index; |
ac6a52eb | 640 | unsigned int numlower; |
9cec54c8 | 641 | char *redirect; |
2664bd08 | 642 | struct dentry *lowerdata; |
ac6a52eb | 643 | }; |
62c832ed AG |
644 | void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip, |
645 | unsigned long ino, int fsid); | |
ca4c8a3a | 646 | struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); |
4b91c30a AG |
647 | struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real, |
648 | bool is_upper); | |
146d62e5 AG |
649 | bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir); |
650 | struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir); | |
ac6a52eb VG |
651 | struct inode *ovl_get_inode(struct super_block *sb, |
652 | struct ovl_inode_params *oip); | |
2878dffc | 653 | void ovl_copyattr(struct inode *to); |
e9be9d5e | 654 | |
72db8211 AG |
655 | /* vfs inode flags copied from real to ovl inode */ |
656 | #define OVL_COPY_I_FLAGS_MASK (S_SYNC | S_NOATIME | S_APPEND | S_IMMUTABLE) | |
096a218a AG |
657 | /* vfs inode flags read from overlay.protattr xattr to ovl inode */ |
658 | #define OVL_PROT_I_FLAGS_MASK (S_APPEND | S_IMMUTABLE) | |
72db8211 AG |
659 | |
660 | /* | |
661 | * fileattr flags copied from lower to upper inode on copy up. | |
096a218a AG |
662 | * We cannot copy up immutable/append-only flags, because that would prevent |
663 | * linking temp inode to upper dir, so we store them in xattr instead. | |
72db8211 AG |
664 | */ |
665 | #define OVL_COPY_FS_FLAGS_MASK (FS_SYNC_FL | FS_NOATIME_FL) | |
666 | #define OVL_COPY_FSX_FLAGS_MASK (FS_XFLAG_SYNC | FS_XFLAG_NOATIME) | |
096a218a AG |
667 | #define OVL_PROT_FS_FLAGS_MASK (FS_APPEND_FL | FS_IMMUTABLE_FL) |
668 | #define OVL_PROT_FSX_FLAGS_MASK (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE) | |
669 | ||
670 | void ovl_check_protattr(struct inode *inode, struct dentry *upper); | |
671 | int ovl_set_protattr(struct inode *inode, struct dentry *upper, | |
672 | struct fileattr *fa); | |
72db8211 | 673 | |
4f357295 MS |
674 | static inline void ovl_copyflags(struct inode *from, struct inode *to) |
675 | { | |
72db8211 | 676 | unsigned int mask = OVL_COPY_I_FLAGS_MASK; |
4f357295 MS |
677 | |
678 | inode_set_flags(to, from->i_flags & mask, mask); | |
679 | } | |
680 | ||
e9be9d5e MS |
681 | /* dir.c */ |
682 | extern const struct inode_operations ovl_dir_inode_operations; | |
c21c839b | 683 | int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir, |
e7dd0e71 | 684 | struct dentry *dentry); |
471ec5dc | 685 | struct ovl_cattr { |
32a3d848 AV |
686 | dev_t rdev; |
687 | umode_t mode; | |
688 | const char *link; | |
471ec5dc | 689 | struct dentry *hardlink; |
32a3d848 | 690 | }; |
471ec5dc AG |
691 | |
692 | #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) }) | |
693 | ||
576bb263 CB |
694 | int ovl_mkdir_real(struct ovl_fs *ofs, struct inode *dir, |
695 | struct dentry **newdentry, umode_t mode); | |
696 | struct dentry *ovl_create_real(struct ovl_fs *ofs, | |
697 | struct inode *dir, struct dentry *newdentry, | |
698 | struct ovl_cattr *attr); | |
699 | int ovl_cleanup(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry); | |
700 | struct dentry *ovl_lookup_temp(struct ovl_fs *ofs, struct dentry *workdir); | |
701 | struct dentry *ovl_create_temp(struct ovl_fs *ofs, struct dentry *workdir, | |
95a1c815 | 702 | struct ovl_cattr *attr); |
e9be9d5e | 703 | |
d1d04ef8 MS |
704 | /* file.c */ |
705 | extern const struct file_operations ovl_file_operations; | |
2406a307 JX |
706 | int __init ovl_aio_request_cache_init(void); |
707 | void ovl_aio_request_cache_destroy(void); | |
2d343087 AV |
708 | int ovl_real_fileattr_get(const struct path *realpath, struct fileattr *fa); |
709 | int ovl_real_fileattr_set(const struct path *realpath, struct fileattr *fa); | |
66dbfabf MS |
710 | int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa); |
711 | int ovl_fileattr_set(struct user_namespace *mnt_userns, | |
712 | struct dentry *dentry, struct fileattr *fa); | |
d1d04ef8 | 713 | |
e9be9d5e MS |
714 | /* copy_up.c */ |
715 | int ovl_copy_up(struct dentry *dentry); | |
d1e6f6a9 | 716 | int ovl_copy_up_with_data(struct dentry *dentry); |
3428030d | 717 | int ovl_maybe_copy_up(struct dentry *dentry, int flags); |
2d343087 | 718 | int ovl_copy_xattr(struct super_block *sb, const struct path *path, struct dentry *new); |
5272eaf3 | 719 | int ovl_set_attr(struct ovl_fs *ofs, struct dentry *upper, struct kstat *stat); |
1cdb0cb6 PT |
720 | struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real, |
721 | bool is_upper); | |
a0c236b1 AG |
722 | int ovl_set_origin(struct ovl_fs *ofs, struct dentry *lower, |
723 | struct dentry *upper); | |
8ed5eec9 AG |
724 | |
725 | /* export.c */ | |
726 | extern const struct export_operations ovl_export_operations; |