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> |
ee023c30 | 11 | #include "ovl_entry.h" |
e9be9d5e | 12 | |
1bd0a3ae | 13 | #undef pr_fmt |
14 | #define pr_fmt(fmt) "overlayfs: " fmt | |
15 | ||
e9be9d5e | 16 | enum ovl_path_type { |
38e813db MS |
17 | __OVL_PATH_UPPER = (1 << 0), |
18 | __OVL_PATH_MERGE = (1 << 1), | |
59548503 | 19 | __OVL_PATH_ORIGIN = (1 << 2), |
e9be9d5e MS |
20 | }; |
21 | ||
1afaba1e MS |
22 | #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) |
23 | #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) | |
59548503 | 24 | #define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN) |
d837a49b | 25 | |
2d2f2d73 MS |
26 | #define OVL_XATTR_NAMESPACE "overlay." |
27 | #define OVL_XATTR_TRUSTED_PREFIX XATTR_TRUSTED_PREFIX OVL_XATTR_NAMESPACE | |
28 | #define OVL_XATTR_USER_PREFIX XATTR_USER_PREFIX OVL_XATTR_NAMESPACE | |
43d193f8 MS |
29 | |
30 | enum ovl_xattr { | |
31 | OVL_XATTR_OPAQUE, | |
32 | OVL_XATTR_REDIRECT, | |
33 | OVL_XATTR_ORIGIN, | |
34 | OVL_XATTR_IMPURE, | |
35 | OVL_XATTR_NLINK, | |
36 | OVL_XATTR_UPPER, | |
37 | OVL_XATTR_METACOPY, | |
096a218a | 38 | OVL_XATTR_PROTATTR, |
43d193f8 | 39 | }; |
3a1e819b | 40 | |
c62520a8 | 41 | enum ovl_inode_flag { |
b79e05aa | 42 | /* Pure upper dir that may contain non pure upper entries */ |
13c72075 | 43 | OVL_IMPURE, |
b79e05aa AG |
44 | /* Non-merge dir that may contain whiteout entries */ |
45 | OVL_WHITEOUTS, | |
359f392c | 46 | OVL_INDEX, |
0c288874 | 47 | OVL_UPPERDATA, |
a00c2d59 VG |
48 | /* Inode number will remain constant over copy up. */ |
49 | OVL_CONST_INO, | |
13c72075 MS |
50 | }; |
51 | ||
c62520a8 AG |
52 | enum ovl_entry_flag { |
53 | OVL_E_UPPER_ALIAS, | |
54 | OVL_E_OPAQUE, | |
2ca3c148 | 55 | OVL_E_CONNECTED, |
c62520a8 AG |
56 | }; |
57 | ||
926e94d7 AG |
58 | enum { |
59 | OVL_XINO_OFF, | |
60 | OVL_XINO_AUTO, | |
61 | OVL_XINO_ON, | |
62 | }; | |
63 | ||
3a1e819b AG |
64 | /* |
65 | * The tuple (fh,uuid) is a universal unique identifier for a copy up origin, | |
66 | * where: | |
67 | * origin.fh - exported file handle of the lower file | |
68 | * origin.uuid - uuid of the lower filesystem | |
69 | */ | |
70 | #define OVL_FH_VERSION 0 | |
71 | #define OVL_FH_MAGIC 0xfb | |
72 | ||
73 | /* CPU byte order required for fid decoding: */ | |
74 | #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) | |
75 | #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) | |
54fb347e AG |
76 | /* Is the real inode encoded in fid an upper inode? */ |
77 | #define OVL_FH_FLAG_PATH_UPPER (1 << 2) | |
3a1e819b | 78 | |
961af647 AG |
79 | #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \ |
80 | OVL_FH_FLAG_PATH_UPPER) | |
3a1e819b AG |
81 | |
82 | #if defined(__LITTLE_ENDIAN) | |
83 | #define OVL_FH_FLAG_CPU_ENDIAN 0 | |
84 | #elif defined(__BIG_ENDIAN) | |
85 | #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN | |
86 | #else | |
87 | #error Endianness not defined | |
88 | #endif | |
89 | ||
cbe7fba8 AG |
90 | /* The type used to be returned by overlay exportfs for misaligned fid */ |
91 | #define OVL_FILEID_V0 0xfb | |
92 | /* The type returned by overlay exportfs for 32bit aligned fid */ | |
93 | #define OVL_FILEID_V1 0xf8 | |
8ed5eec9 | 94 | |
cbe7fba8 AG |
95 | /* On-disk format for "origin" file handle */ |
96 | struct ovl_fb { | |
3a1e819b AG |
97 | u8 version; /* 0 */ |
98 | u8 magic; /* 0xfb */ | |
99 | u8 len; /* size of this header + size of fid */ | |
100 | u8 flags; /* OVL_FH_FLAG_* */ | |
101 | u8 type; /* fid_type of fid */ | |
01633fd2 | 102 | uuid_t uuid; /* uuid of filesystem */ |
0efbe7c4 | 103 | u32 fid[]; /* file identifier should be 32bit aligned in-memory */ |
3a1e819b | 104 | } __packed; |
e9be9d5e | 105 | |
cbe7fba8 AG |
106 | /* In-memory and on-wire format for overlay file handle */ |
107 | struct ovl_fh { | |
108 | u8 padding[3]; /* make sure fb.fid is 32bit aligned */ | |
109 | union { | |
110 | struct ovl_fb fb; | |
111 | u8 buf[0]; | |
112 | }; | |
113 | } __packed; | |
114 | ||
115 | #define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb) | |
116 | #define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len) | |
117 | #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \ | |
118 | offsetof(struct ovl_fb, fid)) | |
119 | ||
2d2f2d73 | 120 | extern const char *const ovl_xattr_table[][2]; |
43d193f8 MS |
121 | static inline const char *ovl_xattr(struct ovl_fs *ofs, enum ovl_xattr ox) |
122 | { | |
2d2f2d73 | 123 | return ovl_xattr_table[ox][ofs->config.userxattr]; |
43d193f8 MS |
124 | } |
125 | ||
a15506ea CB |
126 | /* |
127 | * When changing ownership of an upper object map the intended ownership | |
128 | * according to the upper layer's idmapping. When an upper mount idmaps files | |
129 | * that are stored on-disk as owned by id 1001 to id 1000 this means stat on | |
130 | * this object will report it as being owned by id 1000 when calling stat via | |
131 | * the upper mount. | |
132 | * In order to change ownership of an object so stat reports id 1000 when | |
133 | * called on an idmapped upper mount the value written to disk - i.e., the | |
134 | * value stored in ia_*id - must 1001. The mount mapping helper will thus take | |
135 | * care to map 1000 to 1001. | |
136 | * The mnt idmapping helpers are nops if the upper layer isn't idmapped. | |
137 | */ | |
138 | static inline int ovl_do_notify_change(struct ovl_fs *ofs, | |
139 | struct dentry *upperdentry, | |
140 | struct iattr *attr) | |
141 | { | |
142 | struct user_namespace *upper_mnt_userns = ovl_upper_mnt_userns(ofs); | |
143 | struct user_namespace *fs_userns = i_user_ns(d_inode(upperdentry)); | |
144 | ||
145 | if (attr->ia_valid & ATTR_UID) | |
146 | attr->ia_uid = mapped_kuid_user(upper_mnt_userns, | |
147 | fs_userns, attr->ia_uid); | |
148 | if (attr->ia_valid & ATTR_GID) | |
149 | attr->ia_gid = mapped_kgid_user(upper_mnt_userns, | |
150 | fs_userns, attr->ia_gid); | |
151 | ||
152 | return notify_change(upper_mnt_userns, upperdentry, attr, NULL); | |
153 | } | |
154 | ||
576bb263 CB |
155 | static inline int ovl_do_rmdir(struct ovl_fs *ofs, |
156 | struct inode *dir, struct dentry *dentry) | |
e9be9d5e | 157 | { |
c67cf654 | 158 | int err = vfs_rmdir(ovl_upper_mnt_userns(ofs), dir, dentry); |
6cf00764 | 159 | |
e9be9d5e MS |
160 | pr_debug("rmdir(%pd2) = %i\n", dentry, err); |
161 | return err; | |
162 | } | |
163 | ||
576bb263 CB |
164 | static inline int ovl_do_unlink(struct ovl_fs *ofs, struct inode *dir, |
165 | struct dentry *dentry) | |
e9be9d5e | 166 | { |
c67cf654 | 167 | int err = vfs_unlink(ovl_upper_mnt_userns(ofs), dir, dentry, NULL); |
6cf00764 | 168 | |
e9be9d5e MS |
169 | pr_debug("unlink(%pd2) = %i\n", dentry, err); |
170 | return err; | |
171 | } | |
172 | ||
576bb263 CB |
173 | static inline int ovl_do_link(struct ovl_fs *ofs, struct dentry *old_dentry, |
174 | struct inode *dir, struct dentry *new_dentry) | |
e9be9d5e | 175 | { |
c67cf654 | 176 | int err = vfs_link(old_dentry, ovl_upper_mnt_userns(ofs), dir, new_dentry, NULL); |
6cf00764 AG |
177 | |
178 | pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err); | |
e9be9d5e MS |
179 | return err; |
180 | } | |
181 | ||
576bb263 CB |
182 | static inline int ovl_do_create(struct ovl_fs *ofs, |
183 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 184 | umode_t mode) |
e9be9d5e | 185 | { |
c67cf654 | 186 | int err = vfs_create(ovl_upper_mnt_userns(ofs), dir, dentry, mode, true); |
6cf00764 AG |
187 | |
188 | pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); | |
e9be9d5e MS |
189 | return err; |
190 | } | |
191 | ||
576bb263 CB |
192 | static inline int ovl_do_mkdir(struct ovl_fs *ofs, |
193 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 194 | umode_t mode) |
e9be9d5e | 195 | { |
c67cf654 | 196 | int err = vfs_mkdir(ovl_upper_mnt_userns(ofs), dir, dentry, mode); |
6cf00764 | 197 | pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); |
e9be9d5e MS |
198 | return err; |
199 | } | |
200 | ||
576bb263 CB |
201 | static inline int ovl_do_mknod(struct ovl_fs *ofs, |
202 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 203 | umode_t mode, dev_t dev) |
e9be9d5e | 204 | { |
c67cf654 | 205 | int err = vfs_mknod(ovl_upper_mnt_userns(ofs), dir, dentry, mode, dev); |
6cf00764 AG |
206 | |
207 | pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err); | |
e9be9d5e MS |
208 | return err; |
209 | } | |
210 | ||
576bb263 CB |
211 | static inline int ovl_do_symlink(struct ovl_fs *ofs, |
212 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 213 | const char *oldname) |
e9be9d5e | 214 | { |
c67cf654 | 215 | int err = vfs_symlink(ovl_upper_mnt_userns(ofs), dir, dentry, oldname); |
6cf00764 AG |
216 | |
217 | pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); | |
e9be9d5e MS |
218 | return err; |
219 | } | |
220 | ||
dad7017a CB |
221 | static inline ssize_t ovl_do_getxattr(struct path *path, const char *name, |
222 | void *value, size_t size) | |
d5dc7486 | 223 | { |
dad7017a CB |
224 | int err, len; |
225 | ||
226 | WARN_ON(path->dentry->d_sb != path->mnt->mnt_sb); | |
227 | ||
228 | err = vfs_getxattr(mnt_user_ns(path->mnt), path->dentry, | |
229 | name, value, size); | |
230 | len = (value && err > 0) ? err : 0; | |
5e717c6f AG |
231 | |
232 | pr_debug("getxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n", | |
dad7017a | 233 | path->dentry, name, min(len, 48), value, size, err); |
5e717c6f | 234 | return err; |
d5dc7486 MS |
235 | } |
236 | ||
dad7017a CB |
237 | static inline ssize_t ovl_getxattr_upper(struct ovl_fs *ofs, |
238 | struct dentry *upperdentry, | |
239 | enum ovl_xattr ox, void *value, | |
240 | size_t size) | |
241 | { | |
242 | struct path upperpath = { | |
243 | .dentry = upperdentry, | |
244 | .mnt = ovl_upper_mnt(ofs), | |
245 | }; | |
246 | ||
247 | return ovl_do_getxattr(&upperpath, ovl_xattr(ofs, ox), value, size); | |
248 | } | |
249 | ||
250 | static inline ssize_t ovl_path_getxattr(struct ovl_fs *ofs, | |
251 | struct path *path, | |
252 | enum ovl_xattr ox, void *value, | |
253 | size_t size) | |
c914c0e2 | 254 | { |
dad7017a | 255 | return ovl_do_getxattr(path, ovl_xattr(ofs, ox), value, size); |
c914c0e2 AG |
256 | } |
257 | ||
610afc0b | 258 | static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry, |
c914c0e2 AG |
259 | const char *name, const void *value, |
260 | size_t size, int flags) | |
e9be9d5e | 261 | { |
dad7017a | 262 | int err = vfs_setxattr(ovl_upper_mnt_userns(ofs), dentry, name, value, size, flags); |
c914c0e2 AG |
263 | |
264 | pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, %d) = %i\n", | |
265 | dentry, name, min((int)size, 48), value, size, flags, err); | |
e9be9d5e MS |
266 | return err; |
267 | } | |
268 | ||
c914c0e2 AG |
269 | static inline int ovl_setxattr(struct ovl_fs *ofs, struct dentry *dentry, |
270 | enum ovl_xattr ox, const void *value, | |
271 | size_t size) | |
272 | { | |
273 | return ovl_do_setxattr(ofs, dentry, ovl_xattr(ofs, ox), value, size, 0); | |
274 | } | |
275 | ||
610afc0b | 276 | static inline int ovl_do_removexattr(struct ovl_fs *ofs, struct dentry *dentry, |
c914c0e2 | 277 | const char *name) |
e9be9d5e | 278 | { |
dad7017a | 279 | int err = vfs_removexattr(ovl_upper_mnt_userns(ofs), dentry, name); |
e9be9d5e MS |
280 | pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); |
281 | return err; | |
282 | } | |
283 | ||
c914c0e2 AG |
284 | static inline int ovl_removexattr(struct ovl_fs *ofs, struct dentry *dentry, |
285 | enum ovl_xattr ox) | |
286 | { | |
287 | return ovl_do_removexattr(ofs, dentry, ovl_xattr(ofs, ox)); | |
288 | } | |
289 | ||
576bb263 CB |
290 | static inline int ovl_do_rename(struct ovl_fs *ofs, struct inode *olddir, |
291 | struct dentry *olddentry, struct inode *newdir, | |
292 | struct dentry *newdentry, unsigned int flags) | |
e9be9d5e MS |
293 | { |
294 | int err; | |
9fe61450 | 295 | struct renamedata rd = { |
c67cf654 | 296 | .old_mnt_userns = ovl_upper_mnt_userns(ofs), |
9fe61450 CB |
297 | .old_dir = olddir, |
298 | .old_dentry = olddentry, | |
c67cf654 | 299 | .new_mnt_userns = ovl_upper_mnt_userns(ofs), |
9fe61450 CB |
300 | .new_dir = newdir, |
301 | .new_dentry = newdentry, | |
302 | .flags = flags, | |
303 | }; | |
e9be9d5e | 304 | |
6cf00764 | 305 | pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags); |
9fe61450 | 306 | err = vfs_rename(&rd); |
e9be9d5e | 307 | if (err) { |
2773bf00 | 308 | pr_debug("...rename(%pd2, %pd2, ...) = %i\n", |
e9be9d5e MS |
309 | olddentry, newdentry, err); |
310 | } | |
311 | return err; | |
312 | } | |
313 | ||
576bb263 CB |
314 | static inline int ovl_do_whiteout(struct ovl_fs *ofs, |
315 | struct inode *dir, struct dentry *dentry) | |
e9be9d5e | 316 | { |
c67cf654 | 317 | int err = vfs_whiteout(ovl_upper_mnt_userns(ofs), dir, dentry); |
e9be9d5e MS |
318 | pr_debug("whiteout(%pd2) = %i\n", dentry, err); |
319 | return err; | |
320 | } | |
321 | ||
576bb263 CB |
322 | static inline struct dentry *ovl_do_tmpfile(struct ovl_fs *ofs, |
323 | struct dentry *dentry, umode_t mode) | |
e7f52429 | 324 | { |
c67cf654 | 325 | struct dentry *ret = vfs_tmpfile(ovl_upper_mnt_userns(ofs), dentry, mode, 0); |
7879cb43 | 326 | int err = PTR_ERR_OR_ZERO(ret); |
e7f52429 AG |
327 | |
328 | pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); | |
329 | return ret; | |
330 | } | |
331 | ||
22f289ce CB |
332 | static inline struct dentry *ovl_lookup_upper(struct ovl_fs *ofs, |
333 | const char *name, | |
334 | struct dentry *base, int len) | |
335 | { | |
336 | return lookup_one(ovl_upper_mnt_userns(ofs), name, base, len); | |
337 | } | |
338 | ||
0c288874 VG |
339 | static inline bool ovl_open_flags_need_copy_up(int flags) |
340 | { | |
341 | if (!flags) | |
342 | return false; | |
343 | ||
344 | return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC)); | |
345 | } | |
346 | ||
ca45275c VY |
347 | static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs) |
348 | { | |
349 | /* | |
350 | * To avoid regressions in existing setups with overlay lower offline | |
351 | * changes, we allow lower changes only if none of the new features | |
352 | * are used. | |
353 | */ | |
354 | return (!ofs->config.index && !ofs->config.metacopy && | |
355 | !ofs->config.redirect_dir && ofs->config.xino != OVL_XINO_ON); | |
356 | } | |
357 | ||
358 | ||
bbb1e54d MS |
359 | /* util.c */ |
360 | int ovl_want_write(struct dentry *dentry); | |
361 | void ovl_drop_write(struct dentry *dentry); | |
362 | struct dentry *ovl_workdir(struct dentry *dentry); | |
363 | const struct cred *ovl_override_creds(struct super_block *sb); | |
e487d889 | 364 | int ovl_can_decode_fh(struct super_block *sb); |
02bcd157 | 365 | struct dentry *ovl_indexdir(struct super_block *sb); |
f168f109 AG |
366 | bool ovl_index_all(struct super_block *sb); |
367 | bool ovl_verify_lower(struct super_block *sb); | |
bbb1e54d MS |
368 | struct ovl_entry *ovl_alloc_entry(unsigned int numlower); |
369 | bool ovl_dentry_remote(struct dentry *dentry); | |
f4288844 MS |
370 | void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry, |
371 | unsigned int mask); | |
bbb1e54d | 372 | bool ovl_dentry_weird(struct dentry *dentry); |
e9be9d5e | 373 | enum ovl_path_type ovl_path_type(struct dentry *dentry); |
e9be9d5e MS |
374 | void ovl_path_upper(struct dentry *dentry, struct path *path); |
375 | void ovl_path_lower(struct dentry *dentry, struct path *path); | |
4f93b426 | 376 | void ovl_path_lowerdata(struct dentry *dentry, struct path *path); |
e9be9d5e | 377 | enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); |
1248ea4b | 378 | enum ovl_path_type ovl_path_realdata(struct dentry *dentry, struct path *path); |
e9be9d5e MS |
379 | struct dentry *ovl_dentry_upper(struct dentry *dentry); |
380 | struct dentry *ovl_dentry_lower(struct dentry *dentry); | |
647d253f | 381 | struct dentry *ovl_dentry_lowerdata(struct dentry *dentry); |
13464165 | 382 | const struct ovl_layer *ovl_layer_lower(struct dentry *dentry); |
e9be9d5e | 383 | struct dentry *ovl_dentry_real(struct dentry *dentry); |
1d88f183 | 384 | struct dentry *ovl_i_dentry_upper(struct inode *inode); |
09d8b586 MS |
385 | struct inode *ovl_inode_upper(struct inode *inode); |
386 | struct inode *ovl_inode_lower(struct inode *inode); | |
2664bd08 | 387 | struct inode *ovl_inode_lowerdata(struct inode *inode); |
09d8b586 | 388 | struct inode *ovl_inode_real(struct inode *inode); |
4823d49c | 389 | struct inode *ovl_inode_realdata(struct inode *inode); |
4edb83bb MS |
390 | struct ovl_dir_cache *ovl_dir_cache(struct inode *inode); |
391 | void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache); | |
c62520a8 AG |
392 | void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry); |
393 | void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry); | |
394 | bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry); | |
e9be9d5e | 395 | bool ovl_dentry_is_opaque(struct dentry *dentry); |
c412ce49 | 396 | bool ovl_dentry_is_whiteout(struct dentry *dentry); |
5cf5b477 | 397 | void ovl_dentry_set_opaque(struct dentry *dentry); |
55acc661 MS |
398 | bool ovl_dentry_has_upper_alias(struct dentry *dentry); |
399 | void ovl_dentry_set_upper_alias(struct dentry *dentry); | |
0c288874 VG |
400 | bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags); |
401 | bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags); | |
402 | bool ovl_has_upperdata(struct inode *inode); | |
403 | void ovl_set_upperdata(struct inode *inode); | |
a6c60655 | 404 | bool ovl_redirect_dir(struct super_block *sb); |
a6c60655 MS |
405 | const char *ovl_dentry_get_redirect(struct dentry *dentry); |
406 | void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); | |
09d8b586 | 407 | void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); |
d9854c87 | 408 | void ovl_dir_modified(struct dentry *dentry, bool impurity); |
bbb1e54d MS |
409 | u64 ovl_dentry_version_get(struct dentry *dentry); |
410 | bool ovl_is_whiteout(struct dentry *dentry); | |
e9be9d5e | 411 | struct file *ovl_path_open(struct path *path, int flags); |
0c288874 | 412 | int ovl_copy_up_start(struct dentry *dentry, int flags); |
39d3d60a | 413 | void ovl_copy_up_end(struct dentry *dentry); |
0c288874 | 414 | bool ovl_already_copied_up(struct dentry *dentry, int flags); |
dad7017a CB |
415 | bool ovl_path_check_dir_xattr(struct ovl_fs *ofs, struct path *path, |
416 | enum ovl_xattr ox); | |
417 | bool ovl_path_check_origin_xattr(struct ovl_fs *ofs, struct path *path); | |
418 | ||
419 | static inline bool ovl_check_origin_xattr(struct ovl_fs *ofs, | |
420 | struct dentry *upperdentry) | |
421 | { | |
422 | struct path upperpath = { | |
423 | .dentry = upperdentry, | |
424 | .mnt = ovl_upper_mnt(ofs), | |
425 | }; | |
426 | return ovl_path_check_origin_xattr(ofs, &upperpath); | |
427 | } | |
428 | ||
a0c236b1 | 429 | int ovl_check_setxattr(struct ovl_fs *ofs, struct dentry *upperdentry, |
43d193f8 | 430 | enum ovl_xattr ox, const void *value, size_t size, |
f3a15685 AG |
431 | int xerr); |
432 | int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); | |
ad0af710 AG |
433 | bool ovl_inuse_trylock(struct dentry *dentry); |
434 | void ovl_inuse_unlock(struct dentry *dentry); | |
146d62e5 | 435 | bool ovl_is_inuse(struct dentry *dentry); |
24b33ee1 | 436 | bool ovl_need_index(struct dentry *dentry); |
0e32992f AG |
437 | int ovl_nlink_start(struct dentry *dentry); |
438 | void ovl_nlink_end(struct dentry *dentry); | |
5820dc08 | 439 | int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); |
dad7017a | 440 | int ovl_check_metacopy_xattr(struct ovl_fs *ofs, struct path *path); |
67d756c2 | 441 | bool ovl_is_metacopy_dentry(struct dentry *dentry); |
dad7017a | 442 | char *ovl_get_redirect_xattr(struct ovl_fs *ofs, struct path *path, int padding); |
335d3fc5 | 443 | int ovl_sync_status(struct ovl_fs *ofs); |
f3a15685 | 444 | |
65cd913e AG |
445 | static inline void ovl_set_flag(unsigned long flag, struct inode *inode) |
446 | { | |
447 | set_bit(flag, &OVL_I(inode)->flags); | |
448 | } | |
449 | ||
450 | static inline void ovl_clear_flag(unsigned long flag, struct inode *inode) | |
451 | { | |
452 | clear_bit(flag, &OVL_I(inode)->flags); | |
453 | } | |
454 | ||
455 | static inline bool ovl_test_flag(unsigned long flag, struct inode *inode) | |
456 | { | |
457 | return test_bit(flag, &OVL_I(inode)->flags); | |
458 | } | |
459 | ||
610afc0b | 460 | static inline bool ovl_is_impuredir(struct super_block *sb, |
dad7017a | 461 | struct dentry *upperdentry) |
f3a15685 | 462 | { |
dad7017a CB |
463 | struct ovl_fs *ofs = OVL_FS(sb); |
464 | struct path upperpath = { | |
465 | .dentry = upperdentry, | |
466 | .mnt = ovl_upper_mnt(ofs), | |
467 | }; | |
468 | ||
469 | return ovl_path_check_dir_xattr(ofs, &upperpath, OVL_XATTR_IMPURE); | |
f3a15685 AG |
470 | } |
471 | ||
926e94d7 AG |
472 | /* |
473 | * With xino=auto, we do best effort to keep all inodes on same st_dev and | |
474 | * d_ino consistent with st_ino. | |
475 | * With xino=on, we do the same effort but we warn if we failed. | |
476 | */ | |
477 | static inline bool ovl_xino_warn(struct super_block *sb) | |
478 | { | |
479 | return OVL_FS(sb)->config.xino == OVL_XINO_ON; | |
480 | } | |
481 | ||
0f831ec8 AG |
482 | /* All layers on same fs? */ |
483 | static inline bool ovl_same_fs(struct super_block *sb) | |
e487d889 | 484 | { |
0f831ec8 AG |
485 | return OVL_FS(sb)->xino_mode == 0; |
486 | } | |
e487d889 | 487 | |
0f831ec8 AG |
488 | /* All overlay inodes have same st_dev? */ |
489 | static inline bool ovl_same_dev(struct super_block *sb) | |
490 | { | |
491 | return OVL_FS(sb)->xino_mode >= 0; | |
492 | } | |
493 | ||
494 | static inline unsigned int ovl_xino_bits(struct super_block *sb) | |
495 | { | |
496 | return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0; | |
e487d889 AG |
497 | } |
498 | ||
531d3040 AG |
499 | static inline void ovl_inode_lock(struct inode *inode) |
500 | { | |
501 | mutex_lock(&OVL_I(inode)->lock); | |
502 | } | |
503 | ||
504 | static inline int ovl_inode_lock_interruptible(struct inode *inode) | |
1e92e307 AG |
505 | { |
506 | return mutex_lock_interruptible(&OVL_I(inode)->lock); | |
507 | } | |
508 | ||
509 | static inline void ovl_inode_unlock(struct inode *inode) | |
510 | { | |
511 | mutex_unlock(&OVL_I(inode)->lock); | |
512 | } | |
513 | ||
e9be9d5e | 514 | |
bbb1e54d | 515 | /* namei.c */ |
cbe7fba8 AG |
516 | int ovl_check_fb_len(struct ovl_fb *fb, int fb_len); |
517 | ||
518 | static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len) | |
519 | { | |
522f6e6c AG |
520 | if (fh_len < sizeof(struct ovl_fh)) |
521 | return -EINVAL; | |
522 | ||
cbe7fba8 AG |
523 | return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET); |
524 | } | |
525 | ||
1cdb0cb6 PT |
526 | struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh, |
527 | struct vfsmount *mnt, bool connected); | |
8a22efa1 | 528 | int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, |
f941866f | 529 | struct dentry *upperdentry, struct ovl_path **stackp); |
610afc0b | 530 | int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry, |
43d193f8 | 531 | enum ovl_xattr ox, struct dentry *real, bool is_upper, |
610afc0b | 532 | bool set); |
3b0bfc6e | 533 | struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index); |
1eff1a1d | 534 | int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index); |
1cdb0cb6 PT |
535 | int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin, |
536 | struct qstr *name); | |
91ffe7be | 537 | struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh); |
06170154 AG |
538 | struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, |
539 | struct dentry *origin, bool verify); | |
bbb1e54d | 540 | int ovl_path_next(int idx, struct dentry *dentry, struct path *path); |
1eff1a1d AG |
541 | struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, |
542 | unsigned int flags); | |
bbb1e54d | 543 | bool ovl_lower_positive(struct dentry *dentry); |
e9be9d5e | 544 | |
610afc0b | 545 | static inline int ovl_verify_origin(struct ovl_fs *ofs, struct dentry *upper, |
05122443 AG |
546 | struct dentry *origin, bool set) |
547 | { | |
610afc0b MS |
548 | return ovl_verify_set_fh(ofs, upper, OVL_XATTR_ORIGIN, origin, |
549 | false, set); | |
05122443 AG |
550 | } |
551 | ||
610afc0b MS |
552 | static inline int ovl_verify_upper(struct ovl_fs *ofs, struct dentry *index, |
553 | struct dentry *upper, bool set) | |
ad1d615c | 554 | { |
610afc0b | 555 | return ovl_verify_set_fh(ofs, index, OVL_XATTR_UPPER, upper, true, set); |
ad1d615c AG |
556 | } |
557 | ||
e9be9d5e MS |
558 | /* readdir.c */ |
559 | extern const struct file_operations ovl_dir_operations; | |
61536bed | 560 | struct file *ovl_dir_real_file(const struct file *file, bool want_upper); |
e9be9d5e | 561 | int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); |
576bb263 CB |
562 | void ovl_cleanup_whiteouts(struct ovl_fs *ofs, struct dentry *upper, |
563 | struct list_head *list); | |
e9be9d5e | 564 | void ovl_cache_free(struct list_head *list); |
4edb83bb | 565 | void ovl_dir_cache_free(struct inode *inode); |
45aebeaf | 566 | int ovl_check_d_type_supported(struct path *realpath); |
576bb263 CB |
567 | int ovl_workdir_cleanup(struct ovl_fs *ofs, struct inode *dir, |
568 | struct vfsmount *mnt, struct dentry *dentry, int level); | |
1eff1a1d | 569 | int ovl_indexdir_cleanup(struct ovl_fs *ofs); |
e9be9d5e | 570 | |
65cd913e AG |
571 | /* |
572 | * Can we iterate real dir directly? | |
573 | * | |
574 | * Non-merge dir may contain whiteouts from a time it was a merge upper, before | |
575 | * lower dir was removed under it and possibly before it was rotated from upper | |
576 | * to lower layer. | |
577 | */ | |
578 | static inline bool ovl_dir_is_real(struct dentry *dir) | |
579 | { | |
580 | return !ovl_test_flag(OVL_WHITEOUTS, d_inode(dir)); | |
581 | } | |
582 | ||
e9be9d5e | 583 | /* inode.c */ |
5f8415d6 AG |
584 | int ovl_set_nlink_upper(struct dentry *dentry); |
585 | int ovl_set_nlink_lower(struct dentry *dentry); | |
610afc0b | 586 | unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry, |
caf70cb2 AG |
587 | struct dentry *upperdentry, |
588 | unsigned int fallback); | |
549c7297 CB |
589 | int ovl_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, |
590 | struct iattr *attr); | |
591 | int ovl_getattr(struct user_namespace *mnt_userns, const struct path *path, | |
592 | struct kstat *stat, u32 request_mask, unsigned int flags); | |
593 | int ovl_permission(struct user_namespace *mnt_userns, struct inode *inode, | |
594 | int mask); | |
1d88f183 MS |
595 | int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name, |
596 | const void *value, size_t size, int flags); | |
597 | int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name, | |
0eb45fc3 | 598 | void *value, size_t size); |
e9be9d5e | 599 | ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); |
0cad6246 | 600 | struct posix_acl *ovl_get_acl(struct inode *inode, int type, bool rcu); |
95582b00 | 601 | int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags); |
610afc0b | 602 | bool ovl_is_private_xattr(struct super_block *sb, const char *name); |
e9be9d5e | 603 | |
ac6a52eb | 604 | struct ovl_inode_params { |
01b39dcc | 605 | struct inode *newinode; |
ac6a52eb VG |
606 | struct dentry *upperdentry; |
607 | struct ovl_path *lowerpath; | |
74c6e384 | 608 | bool index; |
ac6a52eb | 609 | unsigned int numlower; |
9cec54c8 | 610 | char *redirect; |
2664bd08 | 611 | struct dentry *lowerdata; |
ac6a52eb | 612 | }; |
62c832ed AG |
613 | void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip, |
614 | unsigned long ino, int fsid); | |
ca4c8a3a | 615 | struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); |
4b91c30a AG |
616 | struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real, |
617 | bool is_upper); | |
146d62e5 AG |
618 | bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir); |
619 | struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir); | |
ac6a52eb VG |
620 | struct inode *ovl_get_inode(struct super_block *sb, |
621 | struct ovl_inode_params *oip); | |
e9be9d5e MS |
622 | static inline void ovl_copyattr(struct inode *from, struct inode *to) |
623 | { | |
624 | to->i_uid = from->i_uid; | |
625 | to->i_gid = from->i_gid; | |
07a2daab | 626 | to->i_mode = from->i_mode; |
d719e8f2 MS |
627 | to->i_atime = from->i_atime; |
628 | to->i_mtime = from->i_mtime; | |
629 | to->i_ctime = from->i_ctime; | |
46e5d0a3 | 630 | i_size_write(to, i_size_read(from)); |
e9be9d5e MS |
631 | } |
632 | ||
72db8211 AG |
633 | /* vfs inode flags copied from real to ovl inode */ |
634 | #define OVL_COPY_I_FLAGS_MASK (S_SYNC | S_NOATIME | S_APPEND | S_IMMUTABLE) | |
096a218a AG |
635 | /* vfs inode flags read from overlay.protattr xattr to ovl inode */ |
636 | #define OVL_PROT_I_FLAGS_MASK (S_APPEND | S_IMMUTABLE) | |
72db8211 AG |
637 | |
638 | /* | |
639 | * fileattr flags copied from lower to upper inode on copy up. | |
096a218a AG |
640 | * We cannot copy up immutable/append-only flags, because that would prevent |
641 | * linking temp inode to upper dir, so we store them in xattr instead. | |
72db8211 AG |
642 | */ |
643 | #define OVL_COPY_FS_FLAGS_MASK (FS_SYNC_FL | FS_NOATIME_FL) | |
644 | #define OVL_COPY_FSX_FLAGS_MASK (FS_XFLAG_SYNC | FS_XFLAG_NOATIME) | |
096a218a AG |
645 | #define OVL_PROT_FS_FLAGS_MASK (FS_APPEND_FL | FS_IMMUTABLE_FL) |
646 | #define OVL_PROT_FSX_FLAGS_MASK (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE) | |
647 | ||
648 | void ovl_check_protattr(struct inode *inode, struct dentry *upper); | |
649 | int ovl_set_protattr(struct inode *inode, struct dentry *upper, | |
650 | struct fileattr *fa); | |
72db8211 | 651 | |
4f357295 MS |
652 | static inline void ovl_copyflags(struct inode *from, struct inode *to) |
653 | { | |
72db8211 | 654 | unsigned int mask = OVL_COPY_I_FLAGS_MASK; |
4f357295 MS |
655 | |
656 | inode_set_flags(to, from->i_flags & mask, mask); | |
657 | } | |
658 | ||
e9be9d5e MS |
659 | /* dir.c */ |
660 | extern const struct inode_operations ovl_dir_inode_operations; | |
c21c839b | 661 | int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir, |
e7dd0e71 | 662 | struct dentry *dentry); |
471ec5dc | 663 | struct ovl_cattr { |
32a3d848 AV |
664 | dev_t rdev; |
665 | umode_t mode; | |
666 | const char *link; | |
471ec5dc | 667 | struct dentry *hardlink; |
32a3d848 | 668 | }; |
471ec5dc AG |
669 | |
670 | #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) }) | |
671 | ||
576bb263 CB |
672 | int ovl_mkdir_real(struct ovl_fs *ofs, struct inode *dir, |
673 | struct dentry **newdentry, umode_t mode); | |
674 | struct dentry *ovl_create_real(struct ovl_fs *ofs, | |
675 | struct inode *dir, struct dentry *newdentry, | |
676 | struct ovl_cattr *attr); | |
677 | int ovl_cleanup(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry); | |
678 | struct dentry *ovl_lookup_temp(struct ovl_fs *ofs, struct dentry *workdir); | |
679 | struct dentry *ovl_create_temp(struct ovl_fs *ofs, struct dentry *workdir, | |
95a1c815 | 680 | struct ovl_cattr *attr); |
e9be9d5e | 681 | |
d1d04ef8 MS |
682 | /* file.c */ |
683 | extern const struct file_operations ovl_file_operations; | |
2406a307 JX |
684 | int __init ovl_aio_request_cache_init(void); |
685 | void ovl_aio_request_cache_destroy(void); | |
72db8211 AG |
686 | int ovl_real_fileattr_get(struct path *realpath, struct fileattr *fa); |
687 | int ovl_real_fileattr_set(struct path *realpath, struct fileattr *fa); | |
66dbfabf MS |
688 | int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa); |
689 | int ovl_fileattr_set(struct user_namespace *mnt_userns, | |
690 | struct dentry *dentry, struct fileattr *fa); | |
d1d04ef8 | 691 | |
e9be9d5e MS |
692 | /* copy_up.c */ |
693 | int ovl_copy_up(struct dentry *dentry); | |
d1e6f6a9 | 694 | int ovl_copy_up_with_data(struct dentry *dentry); |
3428030d | 695 | int ovl_maybe_copy_up(struct dentry *dentry, int flags); |
dad7017a | 696 | int ovl_copy_xattr(struct super_block *sb, struct path *path, struct dentry *new); |
5272eaf3 | 697 | int ovl_set_attr(struct ovl_fs *ofs, struct dentry *upper, struct kstat *stat); |
1cdb0cb6 PT |
698 | struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real, |
699 | bool is_upper); | |
a0c236b1 AG |
700 | int ovl_set_origin(struct ovl_fs *ofs, struct dentry *lower, |
701 | struct dentry *upper); | |
8ed5eec9 AG |
702 | |
703 | /* export.c */ | |
704 | extern const struct export_operations ovl_export_operations; |