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> |
ee023c30 | 10 | #include "ovl_entry.h" |
e9be9d5e | 11 | |
1bd0a3ae | 12 | #undef pr_fmt |
13 | #define pr_fmt(fmt) "overlayfs: " fmt | |
14 | ||
e9be9d5e | 15 | enum ovl_path_type { |
38e813db MS |
16 | __OVL_PATH_UPPER = (1 << 0), |
17 | __OVL_PATH_MERGE = (1 << 1), | |
59548503 | 18 | __OVL_PATH_ORIGIN = (1 << 2), |
e9be9d5e MS |
19 | }; |
20 | ||
1afaba1e MS |
21 | #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) |
22 | #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) | |
59548503 | 23 | #define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN) |
d837a49b | 24 | |
2d2f2d73 MS |
25 | #define OVL_XATTR_NAMESPACE "overlay." |
26 | #define OVL_XATTR_TRUSTED_PREFIX XATTR_TRUSTED_PREFIX OVL_XATTR_NAMESPACE | |
27 | #define OVL_XATTR_USER_PREFIX XATTR_USER_PREFIX OVL_XATTR_NAMESPACE | |
43d193f8 MS |
28 | |
29 | enum ovl_xattr { | |
30 | OVL_XATTR_OPAQUE, | |
31 | OVL_XATTR_REDIRECT, | |
32 | OVL_XATTR_ORIGIN, | |
33 | OVL_XATTR_IMPURE, | |
34 | OVL_XATTR_NLINK, | |
35 | OVL_XATTR_UPPER, | |
36 | OVL_XATTR_METACOPY, | |
096a218a | 37 | OVL_XATTR_PROTATTR, |
43d193f8 | 38 | }; |
3a1e819b | 39 | |
c62520a8 | 40 | enum ovl_inode_flag { |
b79e05aa | 41 | /* Pure upper dir that may contain non pure upper entries */ |
13c72075 | 42 | OVL_IMPURE, |
b79e05aa AG |
43 | /* Non-merge dir that may contain whiteout entries */ |
44 | OVL_WHITEOUTS, | |
359f392c | 45 | OVL_INDEX, |
0c288874 | 46 | OVL_UPPERDATA, |
a00c2d59 VG |
47 | /* Inode number will remain constant over copy up. */ |
48 | OVL_CONST_INO, | |
13c72075 MS |
49 | }; |
50 | ||
c62520a8 AG |
51 | enum ovl_entry_flag { |
52 | OVL_E_UPPER_ALIAS, | |
53 | OVL_E_OPAQUE, | |
2ca3c148 | 54 | OVL_E_CONNECTED, |
c62520a8 AG |
55 | }; |
56 | ||
926e94d7 AG |
57 | enum { |
58 | OVL_XINO_OFF, | |
59 | OVL_XINO_AUTO, | |
60 | OVL_XINO_ON, | |
61 | }; | |
62 | ||
3a1e819b AG |
63 | /* |
64 | * The tuple (fh,uuid) is a universal unique identifier for a copy up origin, | |
65 | * where: | |
66 | * origin.fh - exported file handle of the lower file | |
67 | * origin.uuid - uuid of the lower filesystem | |
68 | */ | |
69 | #define OVL_FH_VERSION 0 | |
70 | #define OVL_FH_MAGIC 0xfb | |
71 | ||
72 | /* CPU byte order required for fid decoding: */ | |
73 | #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) | |
74 | #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) | |
54fb347e AG |
75 | /* Is the real inode encoded in fid an upper inode? */ |
76 | #define OVL_FH_FLAG_PATH_UPPER (1 << 2) | |
3a1e819b | 77 | |
961af647 AG |
78 | #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \ |
79 | OVL_FH_FLAG_PATH_UPPER) | |
3a1e819b AG |
80 | |
81 | #if defined(__LITTLE_ENDIAN) | |
82 | #define OVL_FH_FLAG_CPU_ENDIAN 0 | |
83 | #elif defined(__BIG_ENDIAN) | |
84 | #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN | |
85 | #else | |
86 | #error Endianness not defined | |
87 | #endif | |
88 | ||
cbe7fba8 AG |
89 | /* The type used to be returned by overlay exportfs for misaligned fid */ |
90 | #define OVL_FILEID_V0 0xfb | |
91 | /* The type returned by overlay exportfs for 32bit aligned fid */ | |
92 | #define OVL_FILEID_V1 0xf8 | |
8ed5eec9 | 93 | |
cbe7fba8 AG |
94 | /* On-disk format for "origin" file handle */ |
95 | struct ovl_fb { | |
3a1e819b AG |
96 | u8 version; /* 0 */ |
97 | u8 magic; /* 0xfb */ | |
98 | u8 len; /* size of this header + size of fid */ | |
99 | u8 flags; /* OVL_FH_FLAG_* */ | |
100 | u8 type; /* fid_type of fid */ | |
01633fd2 | 101 | uuid_t uuid; /* uuid of filesystem */ |
0efbe7c4 | 102 | u32 fid[]; /* file identifier should be 32bit aligned in-memory */ |
3a1e819b | 103 | } __packed; |
e9be9d5e | 104 | |
cbe7fba8 AG |
105 | /* In-memory and on-wire format for overlay file handle */ |
106 | struct ovl_fh { | |
107 | u8 padding[3]; /* make sure fb.fid is 32bit aligned */ | |
108 | union { | |
109 | struct ovl_fb fb; | |
110 | u8 buf[0]; | |
111 | }; | |
112 | } __packed; | |
113 | ||
114 | #define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb) | |
115 | #define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len) | |
116 | #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \ | |
117 | offsetof(struct ovl_fb, fid)) | |
118 | ||
2d2f2d73 | 119 | extern const char *const ovl_xattr_table[][2]; |
43d193f8 MS |
120 | static inline const char *ovl_xattr(struct ovl_fs *ofs, enum ovl_xattr ox) |
121 | { | |
2d2f2d73 | 122 | return ovl_xattr_table[ox][ofs->config.userxattr]; |
43d193f8 MS |
123 | } |
124 | ||
576bb263 CB |
125 | static inline int ovl_do_rmdir(struct ovl_fs *ofs, |
126 | struct inode *dir, struct dentry *dentry) | |
e9be9d5e | 127 | { |
c67cf654 | 128 | int err = vfs_rmdir(ovl_upper_mnt_userns(ofs), dir, dentry); |
6cf00764 | 129 | |
e9be9d5e MS |
130 | pr_debug("rmdir(%pd2) = %i\n", dentry, err); |
131 | return err; | |
132 | } | |
133 | ||
576bb263 CB |
134 | static inline int ovl_do_unlink(struct ovl_fs *ofs, struct inode *dir, |
135 | struct dentry *dentry) | |
e9be9d5e | 136 | { |
c67cf654 | 137 | int err = vfs_unlink(ovl_upper_mnt_userns(ofs), dir, dentry, NULL); |
6cf00764 | 138 | |
e9be9d5e MS |
139 | pr_debug("unlink(%pd2) = %i\n", dentry, err); |
140 | return err; | |
141 | } | |
142 | ||
576bb263 CB |
143 | static inline int ovl_do_link(struct ovl_fs *ofs, struct dentry *old_dentry, |
144 | struct inode *dir, struct dentry *new_dentry) | |
e9be9d5e | 145 | { |
c67cf654 | 146 | int err = vfs_link(old_dentry, ovl_upper_mnt_userns(ofs), dir, new_dentry, NULL); |
6cf00764 AG |
147 | |
148 | pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err); | |
e9be9d5e MS |
149 | return err; |
150 | } | |
151 | ||
576bb263 CB |
152 | static inline int ovl_do_create(struct ovl_fs *ofs, |
153 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 154 | umode_t mode) |
e9be9d5e | 155 | { |
c67cf654 | 156 | int err = vfs_create(ovl_upper_mnt_userns(ofs), dir, dentry, mode, true); |
6cf00764 AG |
157 | |
158 | pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); | |
e9be9d5e MS |
159 | return err; |
160 | } | |
161 | ||
576bb263 CB |
162 | static inline int ovl_do_mkdir(struct ovl_fs *ofs, |
163 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 164 | umode_t mode) |
e9be9d5e | 165 | { |
c67cf654 | 166 | int err = vfs_mkdir(ovl_upper_mnt_userns(ofs), dir, dentry, mode); |
6cf00764 | 167 | pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); |
e9be9d5e MS |
168 | return err; |
169 | } | |
170 | ||
576bb263 CB |
171 | static inline int ovl_do_mknod(struct ovl_fs *ofs, |
172 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 173 | umode_t mode, dev_t dev) |
e9be9d5e | 174 | { |
c67cf654 | 175 | int err = vfs_mknod(ovl_upper_mnt_userns(ofs), dir, dentry, mode, dev); |
6cf00764 AG |
176 | |
177 | pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err); | |
e9be9d5e MS |
178 | return err; |
179 | } | |
180 | ||
576bb263 CB |
181 | static inline int ovl_do_symlink(struct ovl_fs *ofs, |
182 | struct inode *dir, struct dentry *dentry, | |
6cf00764 | 183 | const char *oldname) |
e9be9d5e | 184 | { |
c67cf654 | 185 | int err = vfs_symlink(ovl_upper_mnt_userns(ofs), dir, dentry, oldname); |
6cf00764 AG |
186 | |
187 | pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); | |
e9be9d5e MS |
188 | return err; |
189 | } | |
190 | ||
610afc0b | 191 | static inline ssize_t ovl_do_getxattr(struct ovl_fs *ofs, struct dentry *dentry, |
c914c0e2 | 192 | const char *name, void *value, |
610afc0b | 193 | size_t size) |
d5dc7486 | 194 | { |
5e717c6f AG |
195 | int err = vfs_getxattr(&init_user_ns, dentry, name, value, size); |
196 | int len = (value && err > 0) ? err : 0; | |
197 | ||
198 | pr_debug("getxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n", | |
199 | dentry, name, min(len, 48), value, size, err); | |
200 | return err; | |
d5dc7486 MS |
201 | } |
202 | ||
c914c0e2 AG |
203 | static inline ssize_t ovl_getxattr(struct ovl_fs *ofs, struct dentry *dentry, |
204 | enum ovl_xattr ox, void *value, | |
205 | size_t size) | |
206 | { | |
207 | return ovl_do_getxattr(ofs, dentry, ovl_xattr(ofs, ox), value, size); | |
208 | } | |
209 | ||
610afc0b | 210 | static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry, |
c914c0e2 AG |
211 | const char *name, const void *value, |
212 | size_t size, int flags) | |
e9be9d5e | 213 | { |
c914c0e2 AG |
214 | int err = vfs_setxattr(&init_user_ns, dentry, name, value, size, flags); |
215 | ||
216 | pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, %d) = %i\n", | |
217 | dentry, name, min((int)size, 48), value, size, flags, err); | |
e9be9d5e MS |
218 | return err; |
219 | } | |
220 | ||
c914c0e2 AG |
221 | static inline int ovl_setxattr(struct ovl_fs *ofs, struct dentry *dentry, |
222 | enum ovl_xattr ox, const void *value, | |
223 | size_t size) | |
224 | { | |
225 | return ovl_do_setxattr(ofs, dentry, ovl_xattr(ofs, ox), value, size, 0); | |
226 | } | |
227 | ||
610afc0b | 228 | static inline int ovl_do_removexattr(struct ovl_fs *ofs, struct dentry *dentry, |
c914c0e2 | 229 | const char *name) |
e9be9d5e | 230 | { |
c7c7a1a1 | 231 | int err = vfs_removexattr(&init_user_ns, dentry, name); |
e9be9d5e MS |
232 | pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); |
233 | return err; | |
234 | } | |
235 | ||
c914c0e2 AG |
236 | static inline int ovl_removexattr(struct ovl_fs *ofs, struct dentry *dentry, |
237 | enum ovl_xattr ox) | |
238 | { | |
239 | return ovl_do_removexattr(ofs, dentry, ovl_xattr(ofs, ox)); | |
240 | } | |
241 | ||
576bb263 CB |
242 | static inline int ovl_do_rename(struct ovl_fs *ofs, struct inode *olddir, |
243 | struct dentry *olddentry, struct inode *newdir, | |
244 | struct dentry *newdentry, unsigned int flags) | |
e9be9d5e MS |
245 | { |
246 | int err; | |
9fe61450 | 247 | struct renamedata rd = { |
c67cf654 | 248 | .old_mnt_userns = ovl_upper_mnt_userns(ofs), |
9fe61450 CB |
249 | .old_dir = olddir, |
250 | .old_dentry = olddentry, | |
c67cf654 | 251 | .new_mnt_userns = ovl_upper_mnt_userns(ofs), |
9fe61450 CB |
252 | .new_dir = newdir, |
253 | .new_dentry = newdentry, | |
254 | .flags = flags, | |
255 | }; | |
e9be9d5e | 256 | |
6cf00764 | 257 | pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags); |
9fe61450 | 258 | err = vfs_rename(&rd); |
e9be9d5e | 259 | if (err) { |
2773bf00 | 260 | pr_debug("...rename(%pd2, %pd2, ...) = %i\n", |
e9be9d5e MS |
261 | olddentry, newdentry, err); |
262 | } | |
263 | return err; | |
264 | } | |
265 | ||
576bb263 CB |
266 | static inline int ovl_do_whiteout(struct ovl_fs *ofs, |
267 | struct inode *dir, struct dentry *dentry) | |
e9be9d5e | 268 | { |
c67cf654 | 269 | int err = vfs_whiteout(ovl_upper_mnt_userns(ofs), dir, dentry); |
e9be9d5e MS |
270 | pr_debug("whiteout(%pd2) = %i\n", dentry, err); |
271 | return err; | |
272 | } | |
273 | ||
576bb263 CB |
274 | static inline struct dentry *ovl_do_tmpfile(struct ovl_fs *ofs, |
275 | struct dentry *dentry, umode_t mode) | |
e7f52429 | 276 | { |
c67cf654 | 277 | struct dentry *ret = vfs_tmpfile(ovl_upper_mnt_userns(ofs), dentry, mode, 0); |
7879cb43 | 278 | int err = PTR_ERR_OR_ZERO(ret); |
e7f52429 AG |
279 | |
280 | pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); | |
281 | return ret; | |
282 | } | |
283 | ||
0c288874 VG |
284 | static inline bool ovl_open_flags_need_copy_up(int flags) |
285 | { | |
286 | if (!flags) | |
287 | return false; | |
288 | ||
289 | return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC)); | |
290 | } | |
291 | ||
ca45275c VY |
292 | static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs) |
293 | { | |
294 | /* | |
295 | * To avoid regressions in existing setups with overlay lower offline | |
296 | * changes, we allow lower changes only if none of the new features | |
297 | * are used. | |
298 | */ | |
299 | return (!ofs->config.index && !ofs->config.metacopy && | |
300 | !ofs->config.redirect_dir && ofs->config.xino != OVL_XINO_ON); | |
301 | } | |
302 | ||
303 | ||
bbb1e54d MS |
304 | /* util.c */ |
305 | int ovl_want_write(struct dentry *dentry); | |
306 | void ovl_drop_write(struct dentry *dentry); | |
307 | struct dentry *ovl_workdir(struct dentry *dentry); | |
308 | const struct cred *ovl_override_creds(struct super_block *sb); | |
e487d889 | 309 | int ovl_can_decode_fh(struct super_block *sb); |
02bcd157 | 310 | struct dentry *ovl_indexdir(struct super_block *sb); |
f168f109 AG |
311 | bool ovl_index_all(struct super_block *sb); |
312 | bool ovl_verify_lower(struct super_block *sb); | |
bbb1e54d MS |
313 | struct ovl_entry *ovl_alloc_entry(unsigned int numlower); |
314 | bool ovl_dentry_remote(struct dentry *dentry); | |
f4288844 MS |
315 | void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry, |
316 | unsigned int mask); | |
bbb1e54d | 317 | bool ovl_dentry_weird(struct dentry *dentry); |
e9be9d5e | 318 | enum ovl_path_type ovl_path_type(struct dentry *dentry); |
e9be9d5e MS |
319 | void ovl_path_upper(struct dentry *dentry, struct path *path); |
320 | void ovl_path_lower(struct dentry *dentry, struct path *path); | |
4f93b426 | 321 | void ovl_path_lowerdata(struct dentry *dentry, struct path *path); |
e9be9d5e MS |
322 | enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); |
323 | struct dentry *ovl_dentry_upper(struct dentry *dentry); | |
324 | struct dentry *ovl_dentry_lower(struct dentry *dentry); | |
647d253f | 325 | struct dentry *ovl_dentry_lowerdata(struct dentry *dentry); |
13464165 | 326 | const struct ovl_layer *ovl_layer_lower(struct dentry *dentry); |
e9be9d5e | 327 | struct dentry *ovl_dentry_real(struct dentry *dentry); |
1d88f183 | 328 | struct dentry *ovl_i_dentry_upper(struct inode *inode); |
09d8b586 MS |
329 | struct inode *ovl_inode_upper(struct inode *inode); |
330 | struct inode *ovl_inode_lower(struct inode *inode); | |
2664bd08 | 331 | struct inode *ovl_inode_lowerdata(struct inode *inode); |
09d8b586 | 332 | struct inode *ovl_inode_real(struct inode *inode); |
4823d49c | 333 | struct inode *ovl_inode_realdata(struct inode *inode); |
4edb83bb MS |
334 | struct ovl_dir_cache *ovl_dir_cache(struct inode *inode); |
335 | void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache); | |
c62520a8 AG |
336 | void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry); |
337 | void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry); | |
338 | bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry); | |
e9be9d5e | 339 | bool ovl_dentry_is_opaque(struct dentry *dentry); |
c412ce49 | 340 | bool ovl_dentry_is_whiteout(struct dentry *dentry); |
5cf5b477 | 341 | void ovl_dentry_set_opaque(struct dentry *dentry); |
55acc661 MS |
342 | bool ovl_dentry_has_upper_alias(struct dentry *dentry); |
343 | void ovl_dentry_set_upper_alias(struct dentry *dentry); | |
0c288874 VG |
344 | bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags); |
345 | bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags); | |
346 | bool ovl_has_upperdata(struct inode *inode); | |
347 | void ovl_set_upperdata(struct inode *inode); | |
a6c60655 | 348 | bool ovl_redirect_dir(struct super_block *sb); |
a6c60655 MS |
349 | const char *ovl_dentry_get_redirect(struct dentry *dentry); |
350 | void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); | |
09d8b586 | 351 | void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); |
d9854c87 | 352 | void ovl_dir_modified(struct dentry *dentry, bool impurity); |
bbb1e54d MS |
353 | u64 ovl_dentry_version_get(struct dentry *dentry); |
354 | bool ovl_is_whiteout(struct dentry *dentry); | |
e9be9d5e | 355 | struct file *ovl_path_open(struct path *path, int flags); |
0c288874 | 356 | int ovl_copy_up_start(struct dentry *dentry, int flags); |
39d3d60a | 357 | void ovl_copy_up_end(struct dentry *dentry); |
0c288874 | 358 | bool ovl_already_copied_up(struct dentry *dentry, int flags); |
610afc0b MS |
359 | bool ovl_check_origin_xattr(struct ovl_fs *ofs, struct dentry *dentry); |
360 | bool ovl_check_dir_xattr(struct super_block *sb, struct dentry *dentry, | |
43d193f8 | 361 | enum ovl_xattr ox); |
a0c236b1 | 362 | int ovl_check_setxattr(struct ovl_fs *ofs, struct dentry *upperdentry, |
43d193f8 | 363 | enum ovl_xattr ox, const void *value, size_t size, |
f3a15685 AG |
364 | int xerr); |
365 | int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); | |
ad0af710 AG |
366 | bool ovl_inuse_trylock(struct dentry *dentry); |
367 | void ovl_inuse_unlock(struct dentry *dentry); | |
146d62e5 | 368 | bool ovl_is_inuse(struct dentry *dentry); |
24b33ee1 | 369 | bool ovl_need_index(struct dentry *dentry); |
0e32992f AG |
370 | int ovl_nlink_start(struct dentry *dentry); |
371 | void ovl_nlink_end(struct dentry *dentry); | |
5820dc08 | 372 | int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); |
610afc0b | 373 | int ovl_check_metacopy_xattr(struct ovl_fs *ofs, struct dentry *dentry); |
67d756c2 | 374 | bool ovl_is_metacopy_dentry(struct dentry *dentry); |
610afc0b MS |
375 | char *ovl_get_redirect_xattr(struct ovl_fs *ofs, struct dentry *dentry, |
376 | int padding); | |
335d3fc5 | 377 | int ovl_sync_status(struct ovl_fs *ofs); |
f3a15685 | 378 | |
65cd913e AG |
379 | static inline void ovl_set_flag(unsigned long flag, struct inode *inode) |
380 | { | |
381 | set_bit(flag, &OVL_I(inode)->flags); | |
382 | } | |
383 | ||
384 | static inline void ovl_clear_flag(unsigned long flag, struct inode *inode) | |
385 | { | |
386 | clear_bit(flag, &OVL_I(inode)->flags); | |
387 | } | |
388 | ||
389 | static inline bool ovl_test_flag(unsigned long flag, struct inode *inode) | |
390 | { | |
391 | return test_bit(flag, &OVL_I(inode)->flags); | |
392 | } | |
393 | ||
610afc0b MS |
394 | static inline bool ovl_is_impuredir(struct super_block *sb, |
395 | struct dentry *dentry) | |
f3a15685 | 396 | { |
610afc0b | 397 | return ovl_check_dir_xattr(sb, dentry, OVL_XATTR_IMPURE); |
f3a15685 AG |
398 | } |
399 | ||
926e94d7 AG |
400 | /* |
401 | * With xino=auto, we do best effort to keep all inodes on same st_dev and | |
402 | * d_ino consistent with st_ino. | |
403 | * With xino=on, we do the same effort but we warn if we failed. | |
404 | */ | |
405 | static inline bool ovl_xino_warn(struct super_block *sb) | |
406 | { | |
407 | return OVL_FS(sb)->config.xino == OVL_XINO_ON; | |
408 | } | |
409 | ||
0f831ec8 AG |
410 | /* All layers on same fs? */ |
411 | static inline bool ovl_same_fs(struct super_block *sb) | |
e487d889 | 412 | { |
0f831ec8 AG |
413 | return OVL_FS(sb)->xino_mode == 0; |
414 | } | |
e487d889 | 415 | |
0f831ec8 AG |
416 | /* All overlay inodes have same st_dev? */ |
417 | static inline bool ovl_same_dev(struct super_block *sb) | |
418 | { | |
419 | return OVL_FS(sb)->xino_mode >= 0; | |
420 | } | |
421 | ||
422 | static inline unsigned int ovl_xino_bits(struct super_block *sb) | |
423 | { | |
424 | return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0; | |
e487d889 AG |
425 | } |
426 | ||
531d3040 AG |
427 | static inline void ovl_inode_lock(struct inode *inode) |
428 | { | |
429 | mutex_lock(&OVL_I(inode)->lock); | |
430 | } | |
431 | ||
432 | static inline int ovl_inode_lock_interruptible(struct inode *inode) | |
1e92e307 AG |
433 | { |
434 | return mutex_lock_interruptible(&OVL_I(inode)->lock); | |
435 | } | |
436 | ||
437 | static inline void ovl_inode_unlock(struct inode *inode) | |
438 | { | |
439 | mutex_unlock(&OVL_I(inode)->lock); | |
440 | } | |
441 | ||
e9be9d5e | 442 | |
bbb1e54d | 443 | /* namei.c */ |
cbe7fba8 AG |
444 | int ovl_check_fb_len(struct ovl_fb *fb, int fb_len); |
445 | ||
446 | static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len) | |
447 | { | |
522f6e6c AG |
448 | if (fh_len < sizeof(struct ovl_fh)) |
449 | return -EINVAL; | |
450 | ||
cbe7fba8 AG |
451 | return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET); |
452 | } | |
453 | ||
1cdb0cb6 PT |
454 | struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh, |
455 | struct vfsmount *mnt, bool connected); | |
8a22efa1 | 456 | int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, |
f941866f | 457 | struct dentry *upperdentry, struct ovl_path **stackp); |
610afc0b | 458 | int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry, |
43d193f8 | 459 | enum ovl_xattr ox, struct dentry *real, bool is_upper, |
610afc0b | 460 | bool set); |
3b0bfc6e | 461 | struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index); |
1eff1a1d | 462 | int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index); |
1cdb0cb6 PT |
463 | int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin, |
464 | struct qstr *name); | |
91ffe7be | 465 | struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh); |
06170154 AG |
466 | struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, |
467 | struct dentry *origin, bool verify); | |
bbb1e54d | 468 | int ovl_path_next(int idx, struct dentry *dentry, struct path *path); |
1eff1a1d AG |
469 | struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, |
470 | unsigned int flags); | |
bbb1e54d | 471 | bool ovl_lower_positive(struct dentry *dentry); |
e9be9d5e | 472 | |
610afc0b | 473 | static inline int ovl_verify_origin(struct ovl_fs *ofs, struct dentry *upper, |
05122443 AG |
474 | struct dentry *origin, bool set) |
475 | { | |
610afc0b MS |
476 | return ovl_verify_set_fh(ofs, upper, OVL_XATTR_ORIGIN, origin, |
477 | false, set); | |
05122443 AG |
478 | } |
479 | ||
610afc0b MS |
480 | static inline int ovl_verify_upper(struct ovl_fs *ofs, struct dentry *index, |
481 | struct dentry *upper, bool set) | |
ad1d615c | 482 | { |
610afc0b | 483 | return ovl_verify_set_fh(ofs, index, OVL_XATTR_UPPER, upper, true, set); |
ad1d615c AG |
484 | } |
485 | ||
e9be9d5e MS |
486 | /* readdir.c */ |
487 | extern const struct file_operations ovl_dir_operations; | |
61536bed | 488 | struct file *ovl_dir_real_file(const struct file *file, bool want_upper); |
e9be9d5e | 489 | int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); |
576bb263 CB |
490 | void ovl_cleanup_whiteouts(struct ovl_fs *ofs, struct dentry *upper, |
491 | struct list_head *list); | |
e9be9d5e | 492 | void ovl_cache_free(struct list_head *list); |
4edb83bb | 493 | void ovl_dir_cache_free(struct inode *inode); |
45aebeaf | 494 | int ovl_check_d_type_supported(struct path *realpath); |
576bb263 CB |
495 | int ovl_workdir_cleanup(struct ovl_fs *ofs, struct inode *dir, |
496 | struct vfsmount *mnt, struct dentry *dentry, int level); | |
1eff1a1d | 497 | int ovl_indexdir_cleanup(struct ovl_fs *ofs); |
e9be9d5e | 498 | |
65cd913e AG |
499 | /* |
500 | * Can we iterate real dir directly? | |
501 | * | |
502 | * Non-merge dir may contain whiteouts from a time it was a merge upper, before | |
503 | * lower dir was removed under it and possibly before it was rotated from upper | |
504 | * to lower layer. | |
505 | */ | |
506 | static inline bool ovl_dir_is_real(struct dentry *dir) | |
507 | { | |
508 | return !ovl_test_flag(OVL_WHITEOUTS, d_inode(dir)); | |
509 | } | |
510 | ||
e9be9d5e | 511 | /* inode.c */ |
5f8415d6 AG |
512 | int ovl_set_nlink_upper(struct dentry *dentry); |
513 | int ovl_set_nlink_lower(struct dentry *dentry); | |
610afc0b | 514 | unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry, |
caf70cb2 AG |
515 | struct dentry *upperdentry, |
516 | unsigned int fallback); | |
549c7297 CB |
517 | int ovl_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, |
518 | struct iattr *attr); | |
519 | int ovl_getattr(struct user_namespace *mnt_userns, const struct path *path, | |
520 | struct kstat *stat, u32 request_mask, unsigned int flags); | |
521 | int ovl_permission(struct user_namespace *mnt_userns, struct inode *inode, | |
522 | int mask); | |
1d88f183 MS |
523 | int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name, |
524 | const void *value, size_t size, int flags); | |
525 | int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name, | |
0eb45fc3 | 526 | void *value, size_t size); |
e9be9d5e | 527 | ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); |
0cad6246 | 528 | struct posix_acl *ovl_get_acl(struct inode *inode, int type, bool rcu); |
95582b00 | 529 | int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags); |
610afc0b | 530 | bool ovl_is_private_xattr(struct super_block *sb, const char *name); |
e9be9d5e | 531 | |
ac6a52eb | 532 | struct ovl_inode_params { |
01b39dcc | 533 | struct inode *newinode; |
ac6a52eb VG |
534 | struct dentry *upperdentry; |
535 | struct ovl_path *lowerpath; | |
74c6e384 | 536 | bool index; |
ac6a52eb | 537 | unsigned int numlower; |
9cec54c8 | 538 | char *redirect; |
2664bd08 | 539 | struct dentry *lowerdata; |
ac6a52eb | 540 | }; |
62c832ed AG |
541 | void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip, |
542 | unsigned long ino, int fsid); | |
ca4c8a3a | 543 | struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); |
4b91c30a AG |
544 | struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real, |
545 | bool is_upper); | |
146d62e5 AG |
546 | bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir); |
547 | struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir); | |
ac6a52eb VG |
548 | struct inode *ovl_get_inode(struct super_block *sb, |
549 | struct ovl_inode_params *oip); | |
e9be9d5e MS |
550 | static inline void ovl_copyattr(struct inode *from, struct inode *to) |
551 | { | |
552 | to->i_uid = from->i_uid; | |
553 | to->i_gid = from->i_gid; | |
07a2daab | 554 | to->i_mode = from->i_mode; |
d719e8f2 MS |
555 | to->i_atime = from->i_atime; |
556 | to->i_mtime = from->i_mtime; | |
557 | to->i_ctime = from->i_ctime; | |
46e5d0a3 | 558 | i_size_write(to, i_size_read(from)); |
e9be9d5e MS |
559 | } |
560 | ||
72db8211 AG |
561 | /* vfs inode flags copied from real to ovl inode */ |
562 | #define OVL_COPY_I_FLAGS_MASK (S_SYNC | S_NOATIME | S_APPEND | S_IMMUTABLE) | |
096a218a AG |
563 | /* vfs inode flags read from overlay.protattr xattr to ovl inode */ |
564 | #define OVL_PROT_I_FLAGS_MASK (S_APPEND | S_IMMUTABLE) | |
72db8211 AG |
565 | |
566 | /* | |
567 | * fileattr flags copied from lower to upper inode on copy up. | |
096a218a AG |
568 | * We cannot copy up immutable/append-only flags, because that would prevent |
569 | * linking temp inode to upper dir, so we store them in xattr instead. | |
72db8211 AG |
570 | */ |
571 | #define OVL_COPY_FS_FLAGS_MASK (FS_SYNC_FL | FS_NOATIME_FL) | |
572 | #define OVL_COPY_FSX_FLAGS_MASK (FS_XFLAG_SYNC | FS_XFLAG_NOATIME) | |
096a218a AG |
573 | #define OVL_PROT_FS_FLAGS_MASK (FS_APPEND_FL | FS_IMMUTABLE_FL) |
574 | #define OVL_PROT_FSX_FLAGS_MASK (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE) | |
575 | ||
576 | void ovl_check_protattr(struct inode *inode, struct dentry *upper); | |
577 | int ovl_set_protattr(struct inode *inode, struct dentry *upper, | |
578 | struct fileattr *fa); | |
72db8211 | 579 | |
4f357295 MS |
580 | static inline void ovl_copyflags(struct inode *from, struct inode *to) |
581 | { | |
72db8211 | 582 | unsigned int mask = OVL_COPY_I_FLAGS_MASK; |
4f357295 MS |
583 | |
584 | inode_set_flags(to, from->i_flags & mask, mask); | |
585 | } | |
586 | ||
e9be9d5e MS |
587 | /* dir.c */ |
588 | extern const struct inode_operations ovl_dir_inode_operations; | |
c21c839b | 589 | int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir, |
e7dd0e71 | 590 | struct dentry *dentry); |
471ec5dc | 591 | struct ovl_cattr { |
32a3d848 AV |
592 | dev_t rdev; |
593 | umode_t mode; | |
594 | const char *link; | |
471ec5dc | 595 | struct dentry *hardlink; |
32a3d848 | 596 | }; |
471ec5dc AG |
597 | |
598 | #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) }) | |
599 | ||
576bb263 CB |
600 | int ovl_mkdir_real(struct ovl_fs *ofs, struct inode *dir, |
601 | struct dentry **newdentry, umode_t mode); | |
602 | struct dentry *ovl_create_real(struct ovl_fs *ofs, | |
603 | struct inode *dir, struct dentry *newdentry, | |
604 | struct ovl_cattr *attr); | |
605 | int ovl_cleanup(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry); | |
606 | struct dentry *ovl_lookup_temp(struct ovl_fs *ofs, struct dentry *workdir); | |
607 | struct dentry *ovl_create_temp(struct ovl_fs *ofs, struct dentry *workdir, | |
95a1c815 | 608 | struct ovl_cattr *attr); |
e9be9d5e | 609 | |
d1d04ef8 MS |
610 | /* file.c */ |
611 | extern const struct file_operations ovl_file_operations; | |
2406a307 JX |
612 | int __init ovl_aio_request_cache_init(void); |
613 | void ovl_aio_request_cache_destroy(void); | |
72db8211 AG |
614 | int ovl_real_fileattr_get(struct path *realpath, struct fileattr *fa); |
615 | int ovl_real_fileattr_set(struct path *realpath, struct fileattr *fa); | |
66dbfabf MS |
616 | int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa); |
617 | int ovl_fileattr_set(struct user_namespace *mnt_userns, | |
618 | struct dentry *dentry, struct fileattr *fa); | |
d1d04ef8 | 619 | |
e9be9d5e MS |
620 | /* copy_up.c */ |
621 | int ovl_copy_up(struct dentry *dentry); | |
d1e6f6a9 | 622 | int ovl_copy_up_with_data(struct dentry *dentry); |
3428030d | 623 | int ovl_maybe_copy_up(struct dentry *dentry, int flags); |
610afc0b MS |
624 | int ovl_copy_xattr(struct super_block *sb, struct dentry *old, |
625 | struct dentry *new); | |
5272eaf3 | 626 | int ovl_set_attr(struct ovl_fs *ofs, struct dentry *upper, struct kstat *stat); |
1cdb0cb6 PT |
627 | struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real, |
628 | bool is_upper); | |
a0c236b1 AG |
629 | int ovl_set_origin(struct ovl_fs *ofs, struct dentry *lower, |
630 | struct dentry *upper); | |
8ed5eec9 AG |
631 | |
632 | /* export.c */ | |
633 | extern const struct export_operations ovl_export_operations; |