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> |
bf070890 | 10 | #include <linux/fsverity.h> |
22f289ce | 11 | #include <linux/namei.h> |
0e641857 CB |
12 | #include <linux/posix_acl.h> |
13 | #include <linux/posix_acl_xattr.h> | |
ee023c30 | 14 | #include "ovl_entry.h" |
e9be9d5e | 15 | |
1bd0a3ae | 16 | #undef pr_fmt |
17 | #define pr_fmt(fmt) "overlayfs: " fmt | |
18 | ||
e9be9d5e | 19 | enum ovl_path_type { |
38e813db MS |
20 | __OVL_PATH_UPPER = (1 << 0), |
21 | __OVL_PATH_MERGE = (1 << 1), | |
59548503 | 22 | __OVL_PATH_ORIGIN = (1 << 2), |
e9be9d5e MS |
23 | }; |
24 | ||
1afaba1e MS |
25 | #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) |
26 | #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) | |
59548503 | 27 | #define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN) |
d837a49b | 28 | |
2d2f2d73 MS |
29 | #define OVL_XATTR_NAMESPACE "overlay." |
30 | #define OVL_XATTR_TRUSTED_PREFIX XATTR_TRUSTED_PREFIX OVL_XATTR_NAMESPACE | |
d431e652 | 31 | #define OVL_XATTR_TRUSTED_PREFIX_LEN (sizeof(OVL_XATTR_TRUSTED_PREFIX) - 1) |
2d2f2d73 | 32 | #define OVL_XATTR_USER_PREFIX XATTR_USER_PREFIX OVL_XATTR_NAMESPACE |
d431e652 | 33 | #define OVL_XATTR_USER_PREFIX_LEN (sizeof(OVL_XATTR_USER_PREFIX) - 1) |
43d193f8 | 34 | |
dad02fad AL |
35 | #define OVL_XATTR_ESCAPE_PREFIX OVL_XATTR_NAMESPACE |
36 | #define OVL_XATTR_ESCAPE_PREFIX_LEN (sizeof(OVL_XATTR_ESCAPE_PREFIX) - 1) | |
37 | #define OVL_XATTR_ESCAPE_TRUSTED_PREFIX OVL_XATTR_TRUSTED_PREFIX OVL_XATTR_ESCAPE_PREFIX | |
38 | #define OVL_XATTR_ESCAPE_TRUSTED_PREFIX_LEN (sizeof(OVL_XATTR_ESCAPE_TRUSTED_PREFIX) - 1) | |
39 | #define OVL_XATTR_ESCAPE_USER_PREFIX OVL_XATTR_USER_PREFIX OVL_XATTR_ESCAPE_PREFIX | |
40 | #define OVL_XATTR_ESCAPE_USER_PREFIX_LEN (sizeof(OVL_XATTR_ESCAPE_USER_PREFIX) - 1) | |
41 | ||
43d193f8 MS |
42 | enum ovl_xattr { |
43 | OVL_XATTR_OPAQUE, | |
44 | OVL_XATTR_REDIRECT, | |
45 | OVL_XATTR_ORIGIN, | |
46 | OVL_XATTR_IMPURE, | |
47 | OVL_XATTR_NLINK, | |
48 | OVL_XATTR_UPPER, | |
d9544c1b | 49 | OVL_XATTR_UUID, |
43d193f8 | 50 | OVL_XATTR_METACOPY, |
096a218a | 51 | OVL_XATTR_PROTATTR, |
bc8df7a3 | 52 | OVL_XATTR_XWHITEOUT, |
43d193f8 | 53 | }; |
3a1e819b | 54 | |
c62520a8 | 55 | enum ovl_inode_flag { |
b79e05aa | 56 | /* Pure upper dir that may contain non pure upper entries */ |
13c72075 | 57 | OVL_IMPURE, |
b79e05aa AG |
58 | /* Non-merge dir that may contain whiteout entries */ |
59 | OVL_WHITEOUTS, | |
359f392c | 60 | OVL_INDEX, |
0c288874 | 61 | OVL_UPPERDATA, |
a00c2d59 VG |
62 | /* Inode number will remain constant over copy up. */ |
63 | OVL_CONST_INO, | |
184996e9 AL |
64 | OVL_HAS_DIGEST, |
65 | OVL_VERIFIED_DIGEST, | |
13c72075 MS |
66 | }; |
67 | ||
c62520a8 AG |
68 | enum ovl_entry_flag { |
69 | OVL_E_UPPER_ALIAS, | |
70 | OVL_E_OPAQUE, | |
2ca3c148 | 71 | OVL_E_CONNECTED, |
420332b9 AG |
72 | /* Lower stack may contain xwhiteout entries */ |
73 | OVL_E_XWHITEOUTS, | |
c62520a8 AG |
74 | }; |
75 | ||
af5f2396 AG |
76 | enum { |
77 | OVL_REDIRECT_OFF, /* "off" mode is never used. In effect */ | |
78 | OVL_REDIRECT_FOLLOW, /* ...it translates to either "follow" */ | |
79 | OVL_REDIRECT_NOFOLLOW, /* ...or "nofollow". */ | |
80 | OVL_REDIRECT_ON, | |
81 | }; | |
82 | ||
b0504bfe AG |
83 | enum { |
84 | OVL_UUID_OFF, | |
85 | OVL_UUID_NULL, | |
cbb44f09 | 86 | OVL_UUID_AUTO, |
b0504bfe AG |
87 | OVL_UUID_ON, |
88 | }; | |
89 | ||
926e94d7 AG |
90 | enum { |
91 | OVL_XINO_OFF, | |
92 | OVL_XINO_AUTO, | |
93 | OVL_XINO_ON, | |
94 | }; | |
95 | ||
ae8cba40 AL |
96 | enum { |
97 | OVL_VERITY_OFF, | |
98 | OVL_VERITY_ON, | |
99 | OVL_VERITY_REQUIRE, | |
100 | }; | |
101 | ||
3a1e819b AG |
102 | /* |
103 | * The tuple (fh,uuid) is a universal unique identifier for a copy up origin, | |
104 | * where: | |
105 | * origin.fh - exported file handle of the lower file | |
106 | * origin.uuid - uuid of the lower filesystem | |
107 | */ | |
108 | #define OVL_FH_VERSION 0 | |
109 | #define OVL_FH_MAGIC 0xfb | |
110 | ||
111 | /* CPU byte order required for fid decoding: */ | |
112 | #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) | |
113 | #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) | |
54fb347e AG |
114 | /* Is the real inode encoded in fid an upper inode? */ |
115 | #define OVL_FH_FLAG_PATH_UPPER (1 << 2) | |
3a1e819b | 116 | |
961af647 AG |
117 | #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \ |
118 | OVL_FH_FLAG_PATH_UPPER) | |
3a1e819b AG |
119 | |
120 | #if defined(__LITTLE_ENDIAN) | |
121 | #define OVL_FH_FLAG_CPU_ENDIAN 0 | |
122 | #elif defined(__BIG_ENDIAN) | |
123 | #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN | |
124 | #else | |
125 | #error Endianness not defined | |
126 | #endif | |
127 | ||
cbe7fba8 AG |
128 | /* The type used to be returned by overlay exportfs for misaligned fid */ |
129 | #define OVL_FILEID_V0 0xfb | |
130 | /* The type returned by overlay exportfs for 32bit aligned fid */ | |
131 | #define OVL_FILEID_V1 0xf8 | |
8ed5eec9 | 132 | |
cbe7fba8 AG |
133 | /* On-disk format for "origin" file handle */ |
134 | struct ovl_fb { | |
3a1e819b AG |
135 | u8 version; /* 0 */ |
136 | u8 magic; /* 0xfb */ | |
137 | u8 len; /* size of this header + size of fid */ | |
138 | u8 flags; /* OVL_FH_FLAG_* */ | |
139 | u8 type; /* fid_type of fid */ | |
01633fd2 | 140 | uuid_t uuid; /* uuid of filesystem */ |
0efbe7c4 | 141 | u32 fid[]; /* file identifier should be 32bit aligned in-memory */ |
3a1e819b | 142 | } __packed; |
e9be9d5e | 143 | |
cbe7fba8 AG |
144 | /* In-memory and on-wire format for overlay file handle */ |
145 | struct ovl_fh { | |
146 | u8 padding[3]; /* make sure fb.fid is 32bit aligned */ | |
147 | union { | |
148 | struct ovl_fb fb; | |
cf8aa9bf | 149 | DECLARE_FLEX_ARRAY(u8, buf); |
cbe7fba8 AG |
150 | }; |
151 | } __packed; | |
152 | ||
153 | #define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb) | |
154 | #define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len) | |
155 | #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \ | |
156 | offsetof(struct ovl_fb, fid)) | |
157 | ||
bf070890 AL |
158 | /* On-disk format for "metacopy" xattr (if non-zero size) */ |
159 | struct ovl_metacopy { | |
160 | u8 version; /* 0 */ | |
161 | u8 len; /* size of this header + used digest bytes */ | |
162 | u8 flags; | |
163 | u8 digest_algo; /* FS_VERITY_HASH_ALG_* constant, 0 for no digest */ | |
164 | u8 digest[FS_VERITY_MAX_DIGEST_SIZE]; /* Only the used part on disk */ | |
165 | } __packed; | |
166 | ||
167 | #define OVL_METACOPY_MAX_SIZE (sizeof(struct ovl_metacopy)) | |
168 | #define OVL_METACOPY_MIN_SIZE (OVL_METACOPY_MAX_SIZE - FS_VERITY_MAX_DIGEST_SIZE) | |
169 | #define OVL_METACOPY_INIT { 0, OVL_METACOPY_MIN_SIZE } | |
170 | ||
171 | static inline int ovl_metadata_digest_size(const struct ovl_metacopy *metacopy) | |
172 | { | |
173 | if (metacopy->len < OVL_METACOPY_MIN_SIZE) | |
174 | return 0; | |
175 | return (int)metacopy->len - OVL_METACOPY_MIN_SIZE; | |
176 | } | |
177 | ||
9a87907d MS |
178 | /* No atime modification on underlying */ |
179 | #define OVL_OPEN_FLAGS (O_NOATIME) | |
180 | ||
2d2f2d73 | 181 | extern const char *const ovl_xattr_table[][2]; |
43d193f8 MS |
182 | static inline const char *ovl_xattr(struct ovl_fs *ofs, enum ovl_xattr ox) |
183 | { | |
2d2f2d73 | 184 | return ovl_xattr_table[ox][ofs->config.userxattr]; |
43d193f8 MS |
185 | } |
186 | ||
a15506ea CB |
187 | /* |
188 | * When changing ownership of an upper object map the intended ownership | |
189 | * according to the upper layer's idmapping. When an upper mount idmaps files | |
190 | * that are stored on-disk as owned by id 1001 to id 1000 this means stat on | |
191 | * this object will report it as being owned by id 1000 when calling stat via | |
192 | * the upper mount. | |
193 | * In order to change ownership of an object so stat reports id 1000 when | |
194 | * called on an idmapped upper mount the value written to disk - i.e., the | |
195 | * value stored in ia_*id - must 1001. The mount mapping helper will thus take | |
196 | * care to map 1000 to 1001. | |
197 | * The mnt idmapping helpers are nops if the upper layer isn't idmapped. | |
198 | */ | |
199 | static inline int ovl_do_notify_change(struct ovl_fs *ofs, | |
200 | struct dentry *upperdentry, | |
201 | struct iattr *attr) | |
202 | { | |
abf08576 | 203 | return notify_change(ovl_upper_mnt_idmap(ofs), upperdentry, attr, NULL); |
a15506ea CB |
204 | } |
205 | ||
576bb263 CB |
206 | static inline int ovl_do_rmdir(struct ovl_fs *ofs, |
207 | struct inode *dir, struct dentry *dentry) | |
e9be9d5e | 208 | { |
abf08576 | 209 | int err = vfs_rmdir(ovl_upper_mnt_idmap(ofs), dir, dentry); |
6cf00764 | 210 | |
e9be9d5e MS |
211 | pr_debug("rmdir(%pd2) = %i\n", dentry, err); |
212 | return err; | |
213 | } | |
214 | ||
576bb263 CB |
215 | static inline int ovl_do_unlink(struct ovl_fs *ofs, struct inode *dir, |
216 | struct dentry *dentry) | |
e9be9d5e | 217 | { |
abf08576 | 218 | int err = vfs_unlink(ovl_upper_mnt_idmap(ofs), dir, dentry, NULL); |
6cf00764 | 219 | |
e9be9d5e MS |
220 | pr_debug("unlink(%pd2) = %i\n", dentry, err); |
221 | return err; | |
222 | } | |
223 | ||
576bb263 CB |
224 | static inline int ovl_do_link(struct ovl_fs *ofs, struct dentry *old_dentry, |
225 | struct inode *dir, struct dentry *new_dentry) | |
e9be9d5e | 226 | { |
abf08576 CB |
227 | int err = vfs_link(old_dentry, ovl_upper_mnt_idmap(ofs), dir, |
228 | new_dentry, NULL); | |
6cf00764 AG |
229 | |
230 | pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err); | |
e9be9d5e MS |
231 | return err; |
232 | } | |
233 | ||
576bb263 CB |
234 | static inline int ovl_do_create(struct ovl_fs *ofs, |
235 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 236 | umode_t mode) |
e9be9d5e | 237 | { |
abf08576 | 238 | int err = vfs_create(ovl_upper_mnt_idmap(ofs), dir, dentry, mode, true); |
6cf00764 AG |
239 | |
240 | pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); | |
e9be9d5e MS |
241 | return err; |
242 | } | |
243 | ||
576bb263 CB |
244 | static inline int ovl_do_mkdir(struct ovl_fs *ofs, |
245 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 246 | umode_t mode) |
e9be9d5e | 247 | { |
abf08576 | 248 | int err = vfs_mkdir(ovl_upper_mnt_idmap(ofs), dir, dentry, mode); |
6cf00764 | 249 | pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); |
e9be9d5e MS |
250 | return err; |
251 | } | |
252 | ||
576bb263 CB |
253 | static inline int ovl_do_mknod(struct ovl_fs *ofs, |
254 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 255 | umode_t mode, dev_t dev) |
e9be9d5e | 256 | { |
abf08576 | 257 | int err = vfs_mknod(ovl_upper_mnt_idmap(ofs), dir, dentry, mode, dev); |
6cf00764 AG |
258 | |
259 | pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err); | |
e9be9d5e MS |
260 | return err; |
261 | } | |
262 | ||
576bb263 CB |
263 | static inline int ovl_do_symlink(struct ovl_fs *ofs, |
264 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 265 | const char *oldname) |
e9be9d5e | 266 | { |
abf08576 | 267 | int err = vfs_symlink(ovl_upper_mnt_idmap(ofs), dir, dentry, oldname); |
6cf00764 AG |
268 | |
269 | pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); | |
e9be9d5e MS |
270 | return err; |
271 | } | |
272 | ||
2d343087 | 273 | static inline ssize_t ovl_do_getxattr(const struct path *path, const char *name, |
dad7017a | 274 | void *value, size_t size) |
d5dc7486 | 275 | { |
dad7017a CB |
276 | int err, len; |
277 | ||
278 | WARN_ON(path->dentry->d_sb != path->mnt->mnt_sb); | |
279 | ||
4609e1f1 | 280 | err = vfs_getxattr(mnt_idmap(path->mnt), path->dentry, |
dad7017a CB |
281 | name, value, size); |
282 | len = (value && err > 0) ? err : 0; | |
5e717c6f AG |
283 | |
284 | pr_debug("getxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n", | |
dad7017a | 285 | path->dentry, name, min(len, 48), value, size, err); |
5e717c6f | 286 | return err; |
d5dc7486 MS |
287 | } |
288 | ||
dad7017a CB |
289 | static inline ssize_t ovl_getxattr_upper(struct ovl_fs *ofs, |
290 | struct dentry *upperdentry, | |
291 | enum ovl_xattr ox, void *value, | |
292 | size_t size) | |
293 | { | |
294 | struct path upperpath = { | |
295 | .dentry = upperdentry, | |
296 | .mnt = ovl_upper_mnt(ofs), | |
297 | }; | |
298 | ||
299 | return ovl_do_getxattr(&upperpath, ovl_xattr(ofs, ox), value, size); | |
300 | } | |
301 | ||
302 | static inline ssize_t ovl_path_getxattr(struct ovl_fs *ofs, | |
2d343087 | 303 | const struct path *path, |
dad7017a CB |
304 | enum ovl_xattr ox, void *value, |
305 | size_t size) | |
c914c0e2 | 306 | { |
dad7017a | 307 | return ovl_do_getxattr(path, ovl_xattr(ofs, ox), value, size); |
c914c0e2 AG |
308 | } |
309 | ||
610afc0b | 310 | static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry, |
c914c0e2 AG |
311 | const char *name, const void *value, |
312 | size_t size, int flags) | |
e9be9d5e | 313 | { |
4609e1f1 | 314 | int err = vfs_setxattr(ovl_upper_mnt_idmap(ofs), dentry, name, |
6344e669 | 315 | value, size, flags); |
c914c0e2 AG |
316 | |
317 | pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, %d) = %i\n", | |
318 | dentry, name, min((int)size, 48), value, size, flags, err); | |
e9be9d5e MS |
319 | return err; |
320 | } | |
321 | ||
c914c0e2 AG |
322 | static inline int ovl_setxattr(struct ovl_fs *ofs, struct dentry *dentry, |
323 | enum ovl_xattr ox, const void *value, | |
324 | size_t size) | |
325 | { | |
326 | return ovl_do_setxattr(ofs, dentry, ovl_xattr(ofs, ox), value, size, 0); | |
327 | } | |
328 | ||
610afc0b | 329 | static inline int ovl_do_removexattr(struct ovl_fs *ofs, struct dentry *dentry, |
c914c0e2 | 330 | const char *name) |
e9be9d5e | 331 | { |
4609e1f1 | 332 | int err = vfs_removexattr(ovl_upper_mnt_idmap(ofs), dentry, name); |
e9be9d5e MS |
333 | pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); |
334 | return err; | |
335 | } | |
336 | ||
c914c0e2 AG |
337 | static inline int ovl_removexattr(struct ovl_fs *ofs, struct dentry *dentry, |
338 | enum ovl_xattr ox) | |
339 | { | |
340 | return ovl_do_removexattr(ofs, dentry, ovl_xattr(ofs, ox)); | |
341 | } | |
342 | ||
0e641857 CB |
343 | static inline int ovl_do_set_acl(struct ovl_fs *ofs, struct dentry *dentry, |
344 | const char *acl_name, struct posix_acl *acl) | |
345 | { | |
13e83a49 | 346 | return vfs_set_acl(ovl_upper_mnt_idmap(ofs), dentry, acl_name, acl); |
0e641857 CB |
347 | } |
348 | ||
349 | static inline int ovl_do_remove_acl(struct ovl_fs *ofs, struct dentry *dentry, | |
350 | const char *acl_name) | |
351 | { | |
13e83a49 | 352 | return vfs_remove_acl(ovl_upper_mnt_idmap(ofs), dentry, acl_name); |
0e641857 CB |
353 | } |
354 | ||
576bb263 CB |
355 | static inline int ovl_do_rename(struct ovl_fs *ofs, struct inode *olddir, |
356 | struct dentry *olddentry, struct inode *newdir, | |
357 | struct dentry *newdentry, unsigned int flags) | |
e9be9d5e MS |
358 | { |
359 | int err; | |
9fe61450 | 360 | struct renamedata rd = { |
abf08576 | 361 | .old_mnt_idmap = ovl_upper_mnt_idmap(ofs), |
9fe61450 CB |
362 | .old_dir = olddir, |
363 | .old_dentry = olddentry, | |
abf08576 | 364 | .new_mnt_idmap = ovl_upper_mnt_idmap(ofs), |
9fe61450 CB |
365 | .new_dir = newdir, |
366 | .new_dentry = newdentry, | |
367 | .flags = flags, | |
368 | }; | |
e9be9d5e | 369 | |
6cf00764 | 370 | pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags); |
9fe61450 | 371 | err = vfs_rename(&rd); |
e9be9d5e | 372 | if (err) { |
2773bf00 | 373 | pr_debug("...rename(%pd2, %pd2, ...) = %i\n", |
e9be9d5e MS |
374 | olddentry, newdentry, err); |
375 | } | |
376 | return err; | |
377 | } | |
378 | ||
576bb263 CB |
379 | static inline int ovl_do_whiteout(struct ovl_fs *ofs, |
380 | struct inode *dir, struct dentry *dentry) | |
e9be9d5e | 381 | { |
abf08576 | 382 | int err = vfs_whiteout(ovl_upper_mnt_idmap(ofs), dir, dentry); |
e9be9d5e MS |
383 | pr_debug("whiteout(%pd2) = %i\n", dentry, err); |
384 | return err; | |
385 | } | |
386 | ||
2b1a7746 MS |
387 | static inline struct file *ovl_do_tmpfile(struct ovl_fs *ofs, |
388 | struct dentry *dentry, umode_t mode) | |
e7f52429 | 389 | { |
2b1a7746 | 390 | struct path path = { .mnt = ovl_upper_mnt(ofs), .dentry = dentry }; |
d56e0ddb AG |
391 | struct file *file = kernel_tmpfile_open(ovl_upper_mnt_idmap(ofs), &path, |
392 | mode, O_LARGEFILE | O_WRONLY, | |
393 | current_cred()); | |
2b1a7746 | 394 | int err = PTR_ERR_OR_ZERO(file); |
e7f52429 AG |
395 | |
396 | pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); | |
2b1a7746 | 397 | return file; |
e7f52429 AG |
398 | } |
399 | ||
22f289ce CB |
400 | static inline struct dentry *ovl_lookup_upper(struct ovl_fs *ofs, |
401 | const char *name, | |
402 | struct dentry *base, int len) | |
403 | { | |
4609e1f1 | 404 | return lookup_one(ovl_upper_mnt_idmap(ofs), name, base, len); |
22f289ce CB |
405 | } |
406 | ||
0c288874 VG |
407 | static inline bool ovl_open_flags_need_copy_up(int flags) |
408 | { | |
409 | if (!flags) | |
410 | return false; | |
411 | ||
412 | return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC)); | |
413 | } | |
414 | ||
8a924db2 SB |
415 | static inline int ovl_do_getattr(const struct path *path, struct kstat *stat, |
416 | u32 request_mask, unsigned int flags) | |
417 | { | |
418 | if (flags & AT_GETATTR_NOSEC) | |
419 | return vfs_getattr_nosec(path, stat, request_mask, flags); | |
420 | return vfs_getattr(path, stat, request_mask, flags); | |
421 | } | |
422 | ||
bbb1e54d | 423 | /* util.c */ |
d08d3b3c AG |
424 | int ovl_get_write_access(struct dentry *dentry); |
425 | void ovl_put_write_access(struct dentry *dentry); | |
426 | void ovl_start_write(struct dentry *dentry); | |
427 | void ovl_end_write(struct dentry *dentry); | |
bbb1e54d MS |
428 | int ovl_want_write(struct dentry *dentry); |
429 | void ovl_drop_write(struct dentry *dentry); | |
430 | struct dentry *ovl_workdir(struct dentry *dentry); | |
431 | const struct cred *ovl_override_creds(struct super_block *sb); | |
a6293b3e AG |
432 | |
433 | static inline const struct cred *ovl_creds(struct super_block *sb) | |
434 | { | |
435 | return OVL_FS(sb)->creator_cred; | |
436 | } | |
437 | ||
e487d889 | 438 | int ovl_can_decode_fh(struct super_block *sb); |
02bcd157 | 439 | struct dentry *ovl_indexdir(struct super_block *sb); |
f168f109 AG |
440 | bool ovl_index_all(struct super_block *sb); |
441 | bool ovl_verify_lower(struct super_block *sb); | |
163db0da AG |
442 | struct ovl_path *ovl_stack_alloc(unsigned int n); |
443 | void ovl_stack_cpy(struct ovl_path *dst, struct ovl_path *src, unsigned int n); | |
444 | void ovl_stack_put(struct ovl_path *stack, unsigned int n); | |
445 | void ovl_stack_free(struct ovl_path *stack, unsigned int n); | |
bbb1e54d | 446 | struct ovl_entry *ovl_alloc_entry(unsigned int numlower); |
163db0da | 447 | void ovl_free_entry(struct ovl_entry *oe); |
bbb1e54d | 448 | bool ovl_dentry_remote(struct dentry *dentry); |
b07d5cc9 | 449 | void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *realdentry); |
0af950f5 AG |
450 | void ovl_dentry_init_reval(struct dentry *dentry, struct dentry *upperdentry, |
451 | struct ovl_entry *oe); | |
b07d5cc9 | 452 | void ovl_dentry_init_flags(struct dentry *dentry, struct dentry *upperdentry, |
0af950f5 | 453 | struct ovl_entry *oe, unsigned int mask); |
bbb1e54d | 454 | bool ovl_dentry_weird(struct dentry *dentry); |
e9be9d5e | 455 | enum ovl_path_type ovl_path_type(struct dentry *dentry); |
e9be9d5e MS |
456 | void ovl_path_upper(struct dentry *dentry, struct path *path); |
457 | void ovl_path_lower(struct dentry *dentry, struct path *path); | |
4f93b426 | 458 | void ovl_path_lowerdata(struct dentry *dentry, struct path *path); |
b2dd05f1 | 459 | struct inode *ovl_i_path_real(struct inode *inode, struct path *path); |
e9be9d5e | 460 | enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); |
1248ea4b | 461 | enum ovl_path_type ovl_path_realdata(struct dentry *dentry, struct path *path); |
e9be9d5e MS |
462 | struct dentry *ovl_dentry_upper(struct dentry *dentry); |
463 | struct dentry *ovl_dentry_lower(struct dentry *dentry); | |
647d253f | 464 | struct dentry *ovl_dentry_lowerdata(struct dentry *dentry); |
42dd69ae | 465 | int ovl_dentry_set_lowerdata(struct dentry *dentry, struct ovl_path *datapath); |
ffa5723c | 466 | const struct ovl_layer *ovl_i_layer_lower(struct inode *inode); |
13464165 | 467 | const struct ovl_layer *ovl_layer_lower(struct dentry *dentry); |
e9be9d5e | 468 | struct dentry *ovl_dentry_real(struct dentry *dentry); |
1d88f183 | 469 | struct dentry *ovl_i_dentry_upper(struct inode *inode); |
09d8b586 MS |
470 | struct inode *ovl_inode_upper(struct inode *inode); |
471 | struct inode *ovl_inode_lower(struct inode *inode); | |
2664bd08 | 472 | struct inode *ovl_inode_lowerdata(struct inode *inode); |
09d8b586 | 473 | struct inode *ovl_inode_real(struct inode *inode); |
4823d49c | 474 | struct inode *ovl_inode_realdata(struct inode *inode); |
2b21da92 | 475 | const char *ovl_lowerdata_redirect(struct inode *inode); |
4edb83bb MS |
476 | struct ovl_dir_cache *ovl_dir_cache(struct inode *inode); |
477 | void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache); | |
c62520a8 AG |
478 | void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry); |
479 | void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry); | |
480 | bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry); | |
e9be9d5e | 481 | bool ovl_dentry_is_opaque(struct dentry *dentry); |
c412ce49 | 482 | bool ovl_dentry_is_whiteout(struct dentry *dentry); |
5cf5b477 | 483 | void ovl_dentry_set_opaque(struct dentry *dentry); |
420332b9 AG |
484 | bool ovl_dentry_has_xwhiteouts(struct dentry *dentry); |
485 | void ovl_dentry_set_xwhiteouts(struct dentry *dentry); | |
486 | void ovl_layer_set_xwhiteouts(struct ovl_fs *ofs, | |
487 | const struct ovl_layer *layer); | |
55acc661 MS |
488 | bool ovl_dentry_has_upper_alias(struct dentry *dentry); |
489 | void ovl_dentry_set_upper_alias(struct dentry *dentry); | |
0c288874 VG |
490 | bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags); |
491 | bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags); | |
492 | bool ovl_has_upperdata(struct inode *inode); | |
493 | void ovl_set_upperdata(struct inode *inode); | |
a6c60655 MS |
494 | const char *ovl_dentry_get_redirect(struct dentry *dentry); |
495 | void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); | |
09d8b586 | 496 | void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); |
d9854c87 | 497 | void ovl_dir_modified(struct dentry *dentry, bool impurity); |
1fa9c5c5 | 498 | u64 ovl_inode_version_get(struct inode *inode); |
bbb1e54d | 499 | bool ovl_is_whiteout(struct dentry *dentry); |
bc8df7a3 | 500 | bool ovl_path_is_whiteout(struct ovl_fs *ofs, const struct path *path); |
2d343087 | 501 | struct file *ovl_path_open(const struct path *path, int flags); |
0c288874 | 502 | int ovl_copy_up_start(struct dentry *dentry, int flags); |
39d3d60a | 503 | void ovl_copy_up_end(struct dentry *dentry); |
0c288874 | 504 | bool ovl_already_copied_up(struct dentry *dentry, int flags); |
420332b9 AG |
505 | char ovl_get_dir_xattr_val(struct ovl_fs *ofs, const struct path *path, |
506 | enum ovl_xattr ox); | |
2d343087 | 507 | bool ovl_path_check_origin_xattr(struct ovl_fs *ofs, const struct path *path); |
bc8df7a3 | 508 | bool ovl_path_check_xwhiteout_xattr(struct ovl_fs *ofs, const struct path *path); |
d9544c1b AG |
509 | bool ovl_init_uuid_xattr(struct super_block *sb, struct ovl_fs *ofs, |
510 | const struct path *upperpath); | |
dad7017a | 511 | |
bc8df7a3 AL |
512 | static inline bool ovl_upper_is_whiteout(struct ovl_fs *ofs, |
513 | struct dentry *upperdentry) | |
514 | { | |
515 | struct path upperpath = { | |
516 | .dentry = upperdentry, | |
517 | .mnt = ovl_upper_mnt(ofs), | |
518 | }; | |
519 | return ovl_path_is_whiteout(ofs, &upperpath); | |
520 | } | |
521 | ||
dad7017a CB |
522 | static inline bool ovl_check_origin_xattr(struct ovl_fs *ofs, |
523 | struct dentry *upperdentry) | |
524 | { | |
525 | struct path upperpath = { | |
526 | .dentry = upperdentry, | |
527 | .mnt = ovl_upper_mnt(ofs), | |
528 | }; | |
529 | return ovl_path_check_origin_xattr(ofs, &upperpath); | |
530 | } | |
531 | ||
a0c236b1 | 532 | int ovl_check_setxattr(struct ovl_fs *ofs, struct dentry *upperdentry, |
43d193f8 | 533 | enum ovl_xattr ox, const void *value, size_t size, |
f3a15685 AG |
534 | int xerr); |
535 | int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); | |
ad0af710 AG |
536 | bool ovl_inuse_trylock(struct dentry *dentry); |
537 | void ovl_inuse_unlock(struct dentry *dentry); | |
146d62e5 | 538 | bool ovl_is_inuse(struct dentry *dentry); |
24b33ee1 | 539 | bool ovl_need_index(struct dentry *dentry); |
0e32992f AG |
540 | int ovl_nlink_start(struct dentry *dentry); |
541 | void ovl_nlink_end(struct dentry *dentry); | |
5820dc08 | 542 | int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); |
bf070890 AL |
543 | int ovl_check_metacopy_xattr(struct ovl_fs *ofs, const struct path *path, |
544 | struct ovl_metacopy *data); | |
184996e9 AL |
545 | int ovl_set_metacopy_xattr(struct ovl_fs *ofs, struct dentry *d, |
546 | struct ovl_metacopy *metacopy); | |
67d756c2 | 547 | bool ovl_is_metacopy_dentry(struct dentry *dentry); |
2d343087 | 548 | char *ovl_get_redirect_xattr(struct ovl_fs *ofs, const struct path *path, int padding); |
0c71faf5 | 549 | int ovl_ensure_verity_loaded(struct path *path); |
184996e9 AL |
550 | int ovl_get_verity_xattr(struct ovl_fs *ofs, const struct path *path, |
551 | u8 *digest_buf, int *buf_length); | |
552 | int ovl_validate_verity(struct ovl_fs *ofs, | |
553 | struct path *metapath, | |
554 | struct path *datapath); | |
0c71faf5 AL |
555 | int ovl_get_verity_digest(struct ovl_fs *ofs, struct path *src, |
556 | struct ovl_metacopy *metacopy); | |
335d3fc5 | 557 | int ovl_sync_status(struct ovl_fs *ofs); |
f3a15685 | 558 | |
65cd913e AG |
559 | static inline void ovl_set_flag(unsigned long flag, struct inode *inode) |
560 | { | |
561 | set_bit(flag, &OVL_I(inode)->flags); | |
562 | } | |
563 | ||
564 | static inline void ovl_clear_flag(unsigned long flag, struct inode *inode) | |
565 | { | |
566 | clear_bit(flag, &OVL_I(inode)->flags); | |
567 | } | |
568 | ||
569 | static inline bool ovl_test_flag(unsigned long flag, struct inode *inode) | |
570 | { | |
571 | return test_bit(flag, &OVL_I(inode)->flags); | |
572 | } | |
573 | ||
610afc0b | 574 | static inline bool ovl_is_impuredir(struct super_block *sb, |
dad7017a | 575 | struct dentry *upperdentry) |
f3a15685 | 576 | { |
dad7017a CB |
577 | struct ovl_fs *ofs = OVL_FS(sb); |
578 | struct path upperpath = { | |
579 | .dentry = upperdentry, | |
580 | .mnt = ovl_upper_mnt(ofs), | |
581 | }; | |
582 | ||
420332b9 AG |
583 | return ovl_get_dir_xattr_val(ofs, &upperpath, OVL_XATTR_IMPURE) == 'y'; |
584 | } | |
585 | ||
586 | static inline char ovl_get_opaquedir_val(struct ovl_fs *ofs, | |
587 | const struct path *path) | |
588 | { | |
589 | return ovl_get_dir_xattr_val(ofs, path, OVL_XATTR_OPAQUE); | |
f3a15685 AG |
590 | } |
591 | ||
af5f2396 AG |
592 | static inline bool ovl_redirect_follow(struct ovl_fs *ofs) |
593 | { | |
594 | return ofs->config.redirect_mode != OVL_REDIRECT_NOFOLLOW; | |
595 | } | |
596 | ||
597 | static inline bool ovl_redirect_dir(struct ovl_fs *ofs) | |
598 | { | |
599 | return ofs->config.redirect_mode == OVL_REDIRECT_ON; | |
600 | } | |
601 | ||
b0504bfe AG |
602 | static inline bool ovl_origin_uuid(struct ovl_fs *ofs) |
603 | { | |
604 | return ofs->config.uuid != OVL_UUID_OFF; | |
605 | } | |
606 | ||
607 | static inline bool ovl_has_fsid(struct ovl_fs *ofs) | |
608 | { | |
cbb44f09 AG |
609 | return ofs->config.uuid == OVL_UUID_ON || |
610 | ofs->config.uuid == OVL_UUID_AUTO; | |
b0504bfe AG |
611 | } |
612 | ||
926e94d7 AG |
613 | /* |
614 | * With xino=auto, we do best effort to keep all inodes on same st_dev and | |
615 | * d_ino consistent with st_ino. | |
616 | * With xino=on, we do the same effort but we warn if we failed. | |
617 | */ | |
dcb399de | 618 | static inline bool ovl_xino_warn(struct ovl_fs *ofs) |
926e94d7 | 619 | { |
dcb399de | 620 | return ofs->config.xino == OVL_XINO_ON; |
926e94d7 AG |
621 | } |
622 | ||
af5f2396 AG |
623 | /* |
624 | * To avoid regressions in existing setups with overlay lower offline changes, | |
625 | * we allow lower changes only if none of the new features are used. | |
626 | */ | |
627 | static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs) | |
628 | { | |
629 | return (!ofs->config.index && !ofs->config.metacopy && | |
630 | !ovl_redirect_dir(ofs) && !ovl_xino_warn(ofs)); | |
926e94d7 AG |
631 | } |
632 | ||
0f831ec8 | 633 | /* All layers on same fs? */ |
dcb399de | 634 | static inline bool ovl_same_fs(struct ovl_fs *ofs) |
e487d889 | 635 | { |
dcb399de | 636 | return ofs->xino_mode == 0; |
0f831ec8 | 637 | } |
e487d889 | 638 | |
0f831ec8 | 639 | /* All overlay inodes have same st_dev? */ |
dcb399de | 640 | static inline bool ovl_same_dev(struct ovl_fs *ofs) |
0f831ec8 | 641 | { |
dcb399de | 642 | return ofs->xino_mode >= 0; |
0f831ec8 AG |
643 | } |
644 | ||
dcb399de | 645 | static inline unsigned int ovl_xino_bits(struct ovl_fs *ofs) |
0f831ec8 | 646 | { |
dcb399de | 647 | return ovl_same_dev(ofs) ? ofs->xino_mode : 0; |
e487d889 AG |
648 | } |
649 | ||
531d3040 AG |
650 | static inline void ovl_inode_lock(struct inode *inode) |
651 | { | |
652 | mutex_lock(&OVL_I(inode)->lock); | |
653 | } | |
654 | ||
655 | static inline int ovl_inode_lock_interruptible(struct inode *inode) | |
1e92e307 AG |
656 | { |
657 | return mutex_lock_interruptible(&OVL_I(inode)->lock); | |
658 | } | |
659 | ||
660 | static inline void ovl_inode_unlock(struct inode *inode) | |
661 | { | |
662 | mutex_unlock(&OVL_I(inode)->lock); | |
663 | } | |
664 | ||
e9be9d5e | 665 | |
bbb1e54d | 666 | /* namei.c */ |
cbe7fba8 AG |
667 | int ovl_check_fb_len(struct ovl_fb *fb, int fb_len); |
668 | ||
669 | static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len) | |
670 | { | |
522f6e6c AG |
671 | if (fh_len < sizeof(struct ovl_fh)) |
672 | return -EINVAL; | |
673 | ||
cbe7fba8 AG |
674 | return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET); |
675 | } | |
676 | ||
1cdb0cb6 PT |
677 | struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh, |
678 | struct vfsmount *mnt, bool connected); | |
8a22efa1 | 679 | int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, |
f941866f | 680 | struct dentry *upperdentry, struct ovl_path **stackp); |
610afc0b | 681 | int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry, |
5b02bfc1 AG |
682 | enum ovl_xattr ox, const struct ovl_fh *fh, |
683 | bool is_upper, bool set); | |
684 | int ovl_verify_origin_xattr(struct ovl_fs *ofs, struct dentry *dentry, | |
685 | enum ovl_xattr ox, struct dentry *real, | |
686 | bool is_upper, bool set); | |
8ea28765 AG |
687 | struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index, |
688 | bool connected); | |
1eff1a1d | 689 | int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index); |
5b02bfc1 | 690 | int ovl_get_index_name_fh(const struct ovl_fh *fh, struct qstr *name); |
1cdb0cb6 PT |
691 | int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin, |
692 | struct qstr *name); | |
91ffe7be | 693 | struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh); |
06170154 AG |
694 | struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, |
695 | struct dentry *origin, bool verify); | |
420332b9 AG |
696 | int ovl_path_next(int idx, struct dentry *dentry, struct path *path, |
697 | const struct ovl_layer **layer); | |
184996e9 | 698 | int ovl_verify_lowerdata(struct dentry *dentry); |
1eff1a1d AG |
699 | struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, |
700 | unsigned int flags); | |
bbb1e54d | 701 | bool ovl_lower_positive(struct dentry *dentry); |
e9be9d5e | 702 | |
5b02bfc1 AG |
703 | static inline int ovl_verify_origin_fh(struct ovl_fs *ofs, struct dentry *upper, |
704 | const struct ovl_fh *fh, bool set) | |
705 | { | |
706 | return ovl_verify_set_fh(ofs, upper, OVL_XATTR_ORIGIN, fh, false, set); | |
707 | } | |
708 | ||
610afc0b | 709 | static inline int ovl_verify_origin(struct ovl_fs *ofs, struct dentry *upper, |
05122443 AG |
710 | struct dentry *origin, bool set) |
711 | { | |
5b02bfc1 AG |
712 | return ovl_verify_origin_xattr(ofs, upper, OVL_XATTR_ORIGIN, origin, |
713 | false, set); | |
05122443 AG |
714 | } |
715 | ||
610afc0b MS |
716 | static inline int ovl_verify_upper(struct ovl_fs *ofs, struct dentry *index, |
717 | struct dentry *upper, bool set) | |
ad1d615c | 718 | { |
5b02bfc1 AG |
719 | return ovl_verify_origin_xattr(ofs, index, OVL_XATTR_UPPER, upper, |
720 | true, set); | |
ad1d615c AG |
721 | } |
722 | ||
e9be9d5e MS |
723 | /* readdir.c */ |
724 | extern const struct file_operations ovl_dir_operations; | |
61536bed | 725 | struct file *ovl_dir_real_file(const struct file *file, bool want_upper); |
e9be9d5e | 726 | int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); |
576bb263 CB |
727 | void ovl_cleanup_whiteouts(struct ovl_fs *ofs, struct dentry *upper, |
728 | struct list_head *list); | |
e9be9d5e | 729 | void ovl_cache_free(struct list_head *list); |
4edb83bb | 730 | void ovl_dir_cache_free(struct inode *inode); |
2d343087 | 731 | int ovl_check_d_type_supported(const struct path *realpath); |
576bb263 CB |
732 | int ovl_workdir_cleanup(struct ovl_fs *ofs, struct inode *dir, |
733 | struct vfsmount *mnt, struct dentry *dentry, int level); | |
1eff1a1d | 734 | int ovl_indexdir_cleanup(struct ovl_fs *ofs); |
e9be9d5e | 735 | |
65cd913e AG |
736 | /* |
737 | * Can we iterate real dir directly? | |
738 | * | |
739 | * Non-merge dir may contain whiteouts from a time it was a merge upper, before | |
740 | * lower dir was removed under it and possibly before it was rotated from upper | |
741 | * to lower layer. | |
742 | */ | |
1fa9c5c5 | 743 | static inline bool ovl_dir_is_real(struct inode *dir) |
65cd913e | 744 | { |
1fa9c5c5 | 745 | return !ovl_test_flag(OVL_WHITEOUTS, dir); |
65cd913e AG |
746 | } |
747 | ||
e9be9d5e | 748 | /* inode.c */ |
5f8415d6 AG |
749 | int ovl_set_nlink_upper(struct dentry *dentry); |
750 | int ovl_set_nlink_lower(struct dentry *dentry); | |
610afc0b | 751 | unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry, |
caf70cb2 AG |
752 | struct dentry *upperdentry, |
753 | unsigned int fallback); | |
4609e1f1 | 754 | int ovl_permission(struct mnt_idmap *idmap, struct inode *inode, |
549c7297 | 755 | int mask); |
ded53656 YX |
756 | |
757 | #ifdef CONFIG_FS_POSIX_ACL | |
77435322 | 758 | struct posix_acl *do_ovl_get_acl(struct mnt_idmap *idmap, |
6c0a8bfb CB |
759 | struct inode *inode, int type, |
760 | bool rcu, bool noperm); | |
761 | static inline struct posix_acl *ovl_get_inode_acl(struct inode *inode, int type, | |
762 | bool rcu) | |
763 | { | |
77435322 | 764 | return do_ovl_get_acl(&nop_mnt_idmap, inode, type, rcu, true); |
6c0a8bfb | 765 | } |
77435322 | 766 | static inline struct posix_acl *ovl_get_acl(struct mnt_idmap *idmap, |
6c0a8bfb CB |
767 | struct dentry *dentry, int type) |
768 | { | |
77435322 | 769 | return do_ovl_get_acl(idmap, d_inode(dentry), type, false, false); |
6c0a8bfb | 770 | } |
13e83a49 | 771 | int ovl_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, |
0e641857 | 772 | struct posix_acl *acl, int type); |
31acceb9 CB |
773 | struct posix_acl *ovl_get_acl_path(const struct path *path, |
774 | const char *acl_name, bool noperm); | |
ded53656 | 775 | #else |
6c0a8bfb CB |
776 | #define ovl_get_inode_acl NULL |
777 | #define ovl_get_acl NULL | |
0e641857 | 778 | #define ovl_set_acl NULL |
31acceb9 CB |
779 | static inline struct posix_acl *ovl_get_acl_path(const struct path *path, |
780 | const char *acl_name, | |
781 | bool noperm) | |
782 | { | |
783 | return NULL; | |
784 | } | |
ded53656 YX |
785 | #endif |
786 | ||
913e9928 | 787 | int ovl_update_time(struct inode *inode, int flags); |
610afc0b | 788 | bool ovl_is_private_xattr(struct super_block *sb, const char *name); |
e9be9d5e | 789 | |
ac6a52eb | 790 | struct ovl_inode_params { |
01b39dcc | 791 | struct inode *newinode; |
ac6a52eb | 792 | struct dentry *upperdentry; |
0af950f5 | 793 | struct ovl_entry *oe; |
74c6e384 | 794 | bool index; |
9cec54c8 | 795 | char *redirect; |
2b21da92 | 796 | char *lowerdata_redirect; |
ac6a52eb | 797 | }; |
62c832ed AG |
798 | void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip, |
799 | unsigned long ino, int fsid); | |
ca4c8a3a | 800 | struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); |
4b91c30a AG |
801 | struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real, |
802 | bool is_upper); | |
146d62e5 AG |
803 | bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir); |
804 | struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir); | |
ac6a52eb VG |
805 | struct inode *ovl_get_inode(struct super_block *sb, |
806 | struct ovl_inode_params *oip); | |
2878dffc | 807 | void ovl_copyattr(struct inode *to); |
e9be9d5e | 808 | |
72db8211 AG |
809 | /* vfs inode flags copied from real to ovl inode */ |
810 | #define OVL_COPY_I_FLAGS_MASK (S_SYNC | S_NOATIME | S_APPEND | S_IMMUTABLE) | |
096a218a AG |
811 | /* vfs inode flags read from overlay.protattr xattr to ovl inode */ |
812 | #define OVL_PROT_I_FLAGS_MASK (S_APPEND | S_IMMUTABLE) | |
72db8211 AG |
813 | |
814 | /* | |
815 | * fileattr flags copied from lower to upper inode on copy up. | |
096a218a AG |
816 | * We cannot copy up immutable/append-only flags, because that would prevent |
817 | * linking temp inode to upper dir, so we store them in xattr instead. | |
72db8211 AG |
818 | */ |
819 | #define OVL_COPY_FS_FLAGS_MASK (FS_SYNC_FL | FS_NOATIME_FL) | |
820 | #define OVL_COPY_FSX_FLAGS_MASK (FS_XFLAG_SYNC | FS_XFLAG_NOATIME) | |
096a218a AG |
821 | #define OVL_PROT_FS_FLAGS_MASK (FS_APPEND_FL | FS_IMMUTABLE_FL) |
822 | #define OVL_PROT_FSX_FLAGS_MASK (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE) | |
823 | ||
824 | void ovl_check_protattr(struct inode *inode, struct dentry *upper); | |
825 | int ovl_set_protattr(struct inode *inode, struct dentry *upper, | |
826 | struct fileattr *fa); | |
72db8211 | 827 | |
4f357295 MS |
828 | static inline void ovl_copyflags(struct inode *from, struct inode *to) |
829 | { | |
72db8211 | 830 | unsigned int mask = OVL_COPY_I_FLAGS_MASK; |
4f357295 MS |
831 | |
832 | inode_set_flags(to, from->i_flags & mask, mask); | |
833 | } | |
834 | ||
e9be9d5e MS |
835 | /* dir.c */ |
836 | extern const struct inode_operations ovl_dir_inode_operations; | |
c21c839b | 837 | int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir, |
e7dd0e71 | 838 | struct dentry *dentry); |
471ec5dc | 839 | struct ovl_cattr { |
32a3d848 AV |
840 | dev_t rdev; |
841 | umode_t mode; | |
842 | const char *link; | |
471ec5dc | 843 | struct dentry *hardlink; |
32a3d848 | 844 | }; |
471ec5dc AG |
845 | |
846 | #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) }) | |
847 | ||
576bb263 CB |
848 | int ovl_mkdir_real(struct ovl_fs *ofs, struct inode *dir, |
849 | struct dentry **newdentry, umode_t mode); | |
850 | struct dentry *ovl_create_real(struct ovl_fs *ofs, | |
851 | struct inode *dir, struct dentry *newdentry, | |
852 | struct ovl_cattr *attr); | |
853 | int ovl_cleanup(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry); | |
854 | struct dentry *ovl_lookup_temp(struct ovl_fs *ofs, struct dentry *workdir); | |
855 | struct dentry *ovl_create_temp(struct ovl_fs *ofs, struct dentry *workdir, | |
95a1c815 | 856 | struct ovl_cattr *attr); |
e9be9d5e | 857 | |
d1d04ef8 MS |
858 | /* file.c */ |
859 | extern const struct file_operations ovl_file_operations; | |
2d343087 AV |
860 | int ovl_real_fileattr_get(const struct path *realpath, struct fileattr *fa); |
861 | int ovl_real_fileattr_set(const struct path *realpath, struct fileattr *fa); | |
66dbfabf | 862 | int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa); |
8782a9ae | 863 | int ovl_fileattr_set(struct mnt_idmap *idmap, |
66dbfabf | 864 | struct dentry *dentry, struct fileattr *fa); |
d1d04ef8 | 865 | |
e9be9d5e MS |
866 | /* copy_up.c */ |
867 | int ovl_copy_up(struct dentry *dentry); | |
d1e6f6a9 | 868 | int ovl_copy_up_with_data(struct dentry *dentry); |
3428030d | 869 | int ovl_maybe_copy_up(struct dentry *dentry, int flags); |
2d343087 | 870 | int ovl_copy_xattr(struct super_block *sb, const struct path *path, struct dentry *new); |
5272eaf3 | 871 | int ovl_set_attr(struct ovl_fs *ofs, struct dentry *upper, struct kstat *stat); |
1cdb0cb6 PT |
872 | struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real, |
873 | bool is_upper); | |
5b02bfc1 AG |
874 | struct ovl_fh *ovl_get_origin_fh(struct ovl_fs *ofs, struct dentry *origin); |
875 | int ovl_set_origin_fh(struct ovl_fs *ofs, const struct ovl_fh *fh, | |
876 | struct dentry *upper); | |
8ed5eec9 AG |
877 | |
878 | /* export.c */ | |
879 | extern const struct export_operations ovl_export_operations; | |
16aac5ad | 880 | extern const struct export_operations ovl_export_fid_operations; |
7fb7998b CB |
881 | |
882 | /* super.c */ | |
883 | int ovl_fill_super(struct super_block *sb, struct fs_context *fc); | |
884 | ||
885 | /* Will this overlay be forced to mount/remount ro? */ | |
886 | static inline bool ovl_force_readonly(struct ovl_fs *ofs) | |
887 | { | |
888 | return (!ovl_upper_mnt(ofs) || !ofs->workdir); | |
889 | } | |
420a62dd AG |
890 | |
891 | /* xattr.c */ | |
892 | ||
893 | const struct xattr_handler * const *ovl_xattr_handlers(struct ovl_fs *ofs); | |
894 | int ovl_setattr(struct mnt_idmap *idmap, struct dentry *dentry, | |
895 | struct iattr *attr); | |
896 | int ovl_getattr(struct mnt_idmap *idmap, const struct path *path, | |
897 | struct kstat *stat, u32 request_mask, unsigned int flags); | |
898 | ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); |