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, | |
37 | }; | |
3a1e819b | 38 | |
c62520a8 | 39 | enum ovl_inode_flag { |
b79e05aa | 40 | /* Pure upper dir that may contain non pure upper entries */ |
13c72075 | 41 | OVL_IMPURE, |
b79e05aa AG |
42 | /* Non-merge dir that may contain whiteout entries */ |
43 | OVL_WHITEOUTS, | |
359f392c | 44 | OVL_INDEX, |
0c288874 | 45 | OVL_UPPERDATA, |
a00c2d59 VG |
46 | /* Inode number will remain constant over copy up. */ |
47 | OVL_CONST_INO, | |
13c72075 MS |
48 | }; |
49 | ||
c62520a8 AG |
50 | enum ovl_entry_flag { |
51 | OVL_E_UPPER_ALIAS, | |
52 | OVL_E_OPAQUE, | |
2ca3c148 | 53 | OVL_E_CONNECTED, |
c62520a8 AG |
54 | }; |
55 | ||
926e94d7 AG |
56 | enum { |
57 | OVL_XINO_OFF, | |
58 | OVL_XINO_AUTO, | |
59 | OVL_XINO_ON, | |
60 | }; | |
61 | ||
3a1e819b AG |
62 | /* |
63 | * The tuple (fh,uuid) is a universal unique identifier for a copy up origin, | |
64 | * where: | |
65 | * origin.fh - exported file handle of the lower file | |
66 | * origin.uuid - uuid of the lower filesystem | |
67 | */ | |
68 | #define OVL_FH_VERSION 0 | |
69 | #define OVL_FH_MAGIC 0xfb | |
70 | ||
71 | /* CPU byte order required for fid decoding: */ | |
72 | #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) | |
73 | #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) | |
54fb347e AG |
74 | /* Is the real inode encoded in fid an upper inode? */ |
75 | #define OVL_FH_FLAG_PATH_UPPER (1 << 2) | |
3a1e819b | 76 | |
961af647 AG |
77 | #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \ |
78 | OVL_FH_FLAG_PATH_UPPER) | |
3a1e819b AG |
79 | |
80 | #if defined(__LITTLE_ENDIAN) | |
81 | #define OVL_FH_FLAG_CPU_ENDIAN 0 | |
82 | #elif defined(__BIG_ENDIAN) | |
83 | #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN | |
84 | #else | |
85 | #error Endianness not defined | |
86 | #endif | |
87 | ||
cbe7fba8 AG |
88 | /* The type used to be returned by overlay exportfs for misaligned fid */ |
89 | #define OVL_FILEID_V0 0xfb | |
90 | /* The type returned by overlay exportfs for 32bit aligned fid */ | |
91 | #define OVL_FILEID_V1 0xf8 | |
8ed5eec9 | 92 | |
cbe7fba8 AG |
93 | /* On-disk format for "origin" file handle */ |
94 | struct ovl_fb { | |
3a1e819b AG |
95 | u8 version; /* 0 */ |
96 | u8 magic; /* 0xfb */ | |
97 | u8 len; /* size of this header + size of fid */ | |
98 | u8 flags; /* OVL_FH_FLAG_* */ | |
99 | u8 type; /* fid_type of fid */ | |
01633fd2 | 100 | uuid_t uuid; /* uuid of filesystem */ |
0efbe7c4 | 101 | u32 fid[]; /* file identifier should be 32bit aligned in-memory */ |
3a1e819b | 102 | } __packed; |
e9be9d5e | 103 | |
cbe7fba8 AG |
104 | /* In-memory and on-wire format for overlay file handle */ |
105 | struct ovl_fh { | |
106 | u8 padding[3]; /* make sure fb.fid is 32bit aligned */ | |
107 | union { | |
108 | struct ovl_fb fb; | |
109 | u8 buf[0]; | |
110 | }; | |
111 | } __packed; | |
112 | ||
113 | #define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb) | |
114 | #define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len) | |
115 | #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \ | |
116 | offsetof(struct ovl_fb, fid)) | |
117 | ||
2d2f2d73 | 118 | extern const char *const ovl_xattr_table[][2]; |
43d193f8 MS |
119 | static inline const char *ovl_xattr(struct ovl_fs *ofs, enum ovl_xattr ox) |
120 | { | |
2d2f2d73 | 121 | return ovl_xattr_table[ox][ofs->config.userxattr]; |
43d193f8 MS |
122 | } |
123 | ||
e9be9d5e MS |
124 | static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry) |
125 | { | |
6521f891 | 126 | int err = vfs_rmdir(&init_user_ns, dir, dentry); |
6cf00764 | 127 | |
e9be9d5e MS |
128 | pr_debug("rmdir(%pd2) = %i\n", dentry, err); |
129 | return err; | |
130 | } | |
131 | ||
132 | static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry) | |
133 | { | |
6521f891 | 134 | int err = vfs_unlink(&init_user_ns, dir, dentry, NULL); |
6cf00764 | 135 | |
e9be9d5e MS |
136 | pr_debug("unlink(%pd2) = %i\n", dentry, err); |
137 | return err; | |
138 | } | |
139 | ||
140 | static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir, | |
6cf00764 | 141 | struct dentry *new_dentry) |
e9be9d5e | 142 | { |
6521f891 | 143 | int err = vfs_link(old_dentry, &init_user_ns, dir, new_dentry, NULL); |
6cf00764 AG |
144 | |
145 | pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err); | |
e9be9d5e MS |
146 | return err; |
147 | } | |
148 | ||
149 | static inline int ovl_do_create(struct inode *dir, struct dentry *dentry, | |
6cf00764 | 150 | umode_t mode) |
e9be9d5e | 151 | { |
6521f891 | 152 | int err = vfs_create(&init_user_ns, dir, dentry, mode, true); |
6cf00764 AG |
153 | |
154 | pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); | |
e9be9d5e MS |
155 | return err; |
156 | } | |
157 | ||
158 | static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry, | |
6cf00764 | 159 | umode_t mode) |
e9be9d5e | 160 | { |
6521f891 | 161 | int err = vfs_mkdir(&init_user_ns, dir, dentry, mode); |
6cf00764 | 162 | pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); |
e9be9d5e MS |
163 | return err; |
164 | } | |
165 | ||
166 | static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry, | |
6cf00764 | 167 | umode_t mode, dev_t dev) |
e9be9d5e | 168 | { |
6521f891 | 169 | int err = vfs_mknod(&init_user_ns, dir, dentry, mode, dev); |
6cf00764 AG |
170 | |
171 | pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err); | |
e9be9d5e MS |
172 | return err; |
173 | } | |
174 | ||
175 | static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry, | |
6cf00764 | 176 | const char *oldname) |
e9be9d5e | 177 | { |
6521f891 | 178 | int err = vfs_symlink(&init_user_ns, dir, dentry, oldname); |
6cf00764 AG |
179 | |
180 | pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); | |
e9be9d5e MS |
181 | return err; |
182 | } | |
183 | ||
610afc0b | 184 | static inline ssize_t ovl_do_getxattr(struct ovl_fs *ofs, struct dentry *dentry, |
43d193f8 | 185 | enum ovl_xattr ox, void *value, |
610afc0b | 186 | size_t size) |
d5dc7486 | 187 | { |
43d193f8 | 188 | const char *name = ovl_xattr(ofs, ox); |
5e717c6f AG |
189 | int err = vfs_getxattr(&init_user_ns, dentry, name, value, size); |
190 | int len = (value && err > 0) ? err : 0; | |
191 | ||
192 | pr_debug("getxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n", | |
193 | dentry, name, min(len, 48), value, size, err); | |
194 | return err; | |
d5dc7486 MS |
195 | } |
196 | ||
610afc0b | 197 | static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry, |
43d193f8 | 198 | enum ovl_xattr ox, const void *value, |
610afc0b | 199 | size_t size) |
e9be9d5e | 200 | { |
43d193f8 | 201 | const char *name = ovl_xattr(ofs, ox); |
c7c7a1a1 | 202 | int err = vfs_setxattr(&init_user_ns, dentry, name, value, size, 0); |
26150ab5 MS |
203 | pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n", |
204 | dentry, name, min((int)size, 48), value, size, err); | |
e9be9d5e MS |
205 | return err; |
206 | } | |
207 | ||
610afc0b | 208 | static inline int ovl_do_removexattr(struct ovl_fs *ofs, struct dentry *dentry, |
43d193f8 | 209 | enum ovl_xattr ox) |
e9be9d5e | 210 | { |
43d193f8 | 211 | const char *name = ovl_xattr(ofs, ox); |
c7c7a1a1 | 212 | int err = vfs_removexattr(&init_user_ns, dentry, name); |
e9be9d5e MS |
213 | pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); |
214 | return err; | |
215 | } | |
216 | ||
217 | static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry, | |
218 | struct inode *newdir, struct dentry *newdentry, | |
219 | unsigned int flags) | |
220 | { | |
221 | int err; | |
9fe61450 | 222 | struct renamedata rd = { |
6521f891 | 223 | .old_mnt_userns = &init_user_ns, |
9fe61450 CB |
224 | .old_dir = olddir, |
225 | .old_dentry = olddentry, | |
6521f891 | 226 | .new_mnt_userns = &init_user_ns, |
9fe61450 CB |
227 | .new_dir = newdir, |
228 | .new_dentry = newdentry, | |
229 | .flags = flags, | |
230 | }; | |
e9be9d5e | 231 | |
6cf00764 | 232 | pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags); |
9fe61450 | 233 | err = vfs_rename(&rd); |
e9be9d5e | 234 | if (err) { |
2773bf00 | 235 | pr_debug("...rename(%pd2, %pd2, ...) = %i\n", |
e9be9d5e MS |
236 | olddentry, newdentry, err); |
237 | } | |
238 | return err; | |
239 | } | |
240 | ||
241 | static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry) | |
242 | { | |
6521f891 | 243 | int err = vfs_whiteout(&init_user_ns, dir, dentry); |
e9be9d5e MS |
244 | pr_debug("whiteout(%pd2) = %i\n", dentry, err); |
245 | return err; | |
246 | } | |
247 | ||
e7f52429 AG |
248 | static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode) |
249 | { | |
6521f891 | 250 | struct dentry *ret = vfs_tmpfile(&init_user_ns, dentry, mode, 0); |
7879cb43 | 251 | int err = PTR_ERR_OR_ZERO(ret); |
e7f52429 AG |
252 | |
253 | pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); | |
254 | return ret; | |
255 | } | |
256 | ||
0c288874 VG |
257 | static inline bool ovl_open_flags_need_copy_up(int flags) |
258 | { | |
259 | if (!flags) | |
260 | return false; | |
261 | ||
262 | return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC)); | |
263 | } | |
264 | ||
bbb1e54d MS |
265 | /* util.c */ |
266 | int ovl_want_write(struct dentry *dentry); | |
267 | void ovl_drop_write(struct dentry *dentry); | |
268 | struct dentry *ovl_workdir(struct dentry *dentry); | |
269 | const struct cred *ovl_override_creds(struct super_block *sb); | |
e487d889 | 270 | int ovl_can_decode_fh(struct super_block *sb); |
02bcd157 | 271 | struct dentry *ovl_indexdir(struct super_block *sb); |
f168f109 AG |
272 | bool ovl_index_all(struct super_block *sb); |
273 | bool ovl_verify_lower(struct super_block *sb); | |
bbb1e54d MS |
274 | struct ovl_entry *ovl_alloc_entry(unsigned int numlower); |
275 | bool ovl_dentry_remote(struct dentry *dentry); | |
f4288844 MS |
276 | void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry, |
277 | unsigned int mask); | |
bbb1e54d | 278 | bool ovl_dentry_weird(struct dentry *dentry); |
e9be9d5e | 279 | enum ovl_path_type ovl_path_type(struct dentry *dentry); |
e9be9d5e MS |
280 | void ovl_path_upper(struct dentry *dentry, struct path *path); |
281 | void ovl_path_lower(struct dentry *dentry, struct path *path); | |
4f93b426 | 282 | void ovl_path_lowerdata(struct dentry *dentry, struct path *path); |
e9be9d5e MS |
283 | enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); |
284 | struct dentry *ovl_dentry_upper(struct dentry *dentry); | |
285 | struct dentry *ovl_dentry_lower(struct dentry *dentry); | |
647d253f | 286 | struct dentry *ovl_dentry_lowerdata(struct dentry *dentry); |
13464165 | 287 | const struct ovl_layer *ovl_layer_lower(struct dentry *dentry); |
e9be9d5e | 288 | struct dentry *ovl_dentry_real(struct dentry *dentry); |
1d88f183 | 289 | struct dentry *ovl_i_dentry_upper(struct inode *inode); |
09d8b586 MS |
290 | struct inode *ovl_inode_upper(struct inode *inode); |
291 | struct inode *ovl_inode_lower(struct inode *inode); | |
2664bd08 | 292 | struct inode *ovl_inode_lowerdata(struct inode *inode); |
09d8b586 | 293 | struct inode *ovl_inode_real(struct inode *inode); |
4823d49c | 294 | struct inode *ovl_inode_realdata(struct inode *inode); |
4edb83bb MS |
295 | struct ovl_dir_cache *ovl_dir_cache(struct inode *inode); |
296 | void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache); | |
c62520a8 AG |
297 | void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry); |
298 | void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry); | |
299 | bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry); | |
e9be9d5e | 300 | bool ovl_dentry_is_opaque(struct dentry *dentry); |
c412ce49 | 301 | bool ovl_dentry_is_whiteout(struct dentry *dentry); |
5cf5b477 | 302 | void ovl_dentry_set_opaque(struct dentry *dentry); |
55acc661 MS |
303 | bool ovl_dentry_has_upper_alias(struct dentry *dentry); |
304 | void ovl_dentry_set_upper_alias(struct dentry *dentry); | |
0c288874 VG |
305 | bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags); |
306 | bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags); | |
307 | bool ovl_has_upperdata(struct inode *inode); | |
308 | void ovl_set_upperdata(struct inode *inode); | |
a6c60655 | 309 | bool ovl_redirect_dir(struct super_block *sb); |
a6c60655 MS |
310 | const char *ovl_dentry_get_redirect(struct dentry *dentry); |
311 | void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); | |
09d8b586 | 312 | void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); |
d9854c87 | 313 | void ovl_dir_modified(struct dentry *dentry, bool impurity); |
bbb1e54d MS |
314 | u64 ovl_dentry_version_get(struct dentry *dentry); |
315 | bool ovl_is_whiteout(struct dentry *dentry); | |
e9be9d5e | 316 | struct file *ovl_path_open(struct path *path, int flags); |
0c288874 | 317 | int ovl_copy_up_start(struct dentry *dentry, int flags); |
39d3d60a | 318 | void ovl_copy_up_end(struct dentry *dentry); |
0c288874 | 319 | bool ovl_already_copied_up(struct dentry *dentry, int flags); |
610afc0b MS |
320 | bool ovl_check_origin_xattr(struct ovl_fs *ofs, struct dentry *dentry); |
321 | bool ovl_check_dir_xattr(struct super_block *sb, struct dentry *dentry, | |
43d193f8 | 322 | enum ovl_xattr ox); |
a0c236b1 | 323 | int ovl_check_setxattr(struct ovl_fs *ofs, struct dentry *upperdentry, |
43d193f8 | 324 | enum ovl_xattr ox, const void *value, size_t size, |
f3a15685 AG |
325 | int xerr); |
326 | int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); | |
ad0af710 AG |
327 | bool ovl_inuse_trylock(struct dentry *dentry); |
328 | void ovl_inuse_unlock(struct dentry *dentry); | |
146d62e5 | 329 | bool ovl_is_inuse(struct dentry *dentry); |
24b33ee1 | 330 | bool ovl_need_index(struct dentry *dentry); |
0e32992f AG |
331 | int ovl_nlink_start(struct dentry *dentry); |
332 | void ovl_nlink_end(struct dentry *dentry); | |
5820dc08 | 333 | int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); |
610afc0b | 334 | int ovl_check_metacopy_xattr(struct ovl_fs *ofs, struct dentry *dentry); |
67d756c2 | 335 | bool ovl_is_metacopy_dentry(struct dentry *dentry); |
610afc0b MS |
336 | char *ovl_get_redirect_xattr(struct ovl_fs *ofs, struct dentry *dentry, |
337 | int padding); | |
335d3fc5 | 338 | int ovl_sync_status(struct ovl_fs *ofs); |
f3a15685 | 339 | |
65cd913e AG |
340 | static inline void ovl_set_flag(unsigned long flag, struct inode *inode) |
341 | { | |
342 | set_bit(flag, &OVL_I(inode)->flags); | |
343 | } | |
344 | ||
345 | static inline void ovl_clear_flag(unsigned long flag, struct inode *inode) | |
346 | { | |
347 | clear_bit(flag, &OVL_I(inode)->flags); | |
348 | } | |
349 | ||
350 | static inline bool ovl_test_flag(unsigned long flag, struct inode *inode) | |
351 | { | |
352 | return test_bit(flag, &OVL_I(inode)->flags); | |
353 | } | |
354 | ||
610afc0b MS |
355 | static inline bool ovl_is_impuredir(struct super_block *sb, |
356 | struct dentry *dentry) | |
f3a15685 | 357 | { |
610afc0b | 358 | return ovl_check_dir_xattr(sb, dentry, OVL_XATTR_IMPURE); |
f3a15685 AG |
359 | } |
360 | ||
926e94d7 AG |
361 | /* |
362 | * With xino=auto, we do best effort to keep all inodes on same st_dev and | |
363 | * d_ino consistent with st_ino. | |
364 | * With xino=on, we do the same effort but we warn if we failed. | |
365 | */ | |
366 | static inline bool ovl_xino_warn(struct super_block *sb) | |
367 | { | |
368 | return OVL_FS(sb)->config.xino == OVL_XINO_ON; | |
369 | } | |
370 | ||
0f831ec8 AG |
371 | /* All layers on same fs? */ |
372 | static inline bool ovl_same_fs(struct super_block *sb) | |
e487d889 | 373 | { |
0f831ec8 AG |
374 | return OVL_FS(sb)->xino_mode == 0; |
375 | } | |
e487d889 | 376 | |
0f831ec8 AG |
377 | /* All overlay inodes have same st_dev? */ |
378 | static inline bool ovl_same_dev(struct super_block *sb) | |
379 | { | |
380 | return OVL_FS(sb)->xino_mode >= 0; | |
381 | } | |
382 | ||
383 | static inline unsigned int ovl_xino_bits(struct super_block *sb) | |
384 | { | |
385 | return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0; | |
e487d889 AG |
386 | } |
387 | ||
531d3040 AG |
388 | static inline void ovl_inode_lock(struct inode *inode) |
389 | { | |
390 | mutex_lock(&OVL_I(inode)->lock); | |
391 | } | |
392 | ||
393 | static inline int ovl_inode_lock_interruptible(struct inode *inode) | |
1e92e307 AG |
394 | { |
395 | return mutex_lock_interruptible(&OVL_I(inode)->lock); | |
396 | } | |
397 | ||
398 | static inline void ovl_inode_unlock(struct inode *inode) | |
399 | { | |
400 | mutex_unlock(&OVL_I(inode)->lock); | |
401 | } | |
402 | ||
e9be9d5e | 403 | |
bbb1e54d | 404 | /* namei.c */ |
cbe7fba8 AG |
405 | int ovl_check_fb_len(struct ovl_fb *fb, int fb_len); |
406 | ||
407 | static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len) | |
408 | { | |
522f6e6c AG |
409 | if (fh_len < sizeof(struct ovl_fh)) |
410 | return -EINVAL; | |
411 | ||
cbe7fba8 AG |
412 | return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET); |
413 | } | |
414 | ||
1cdb0cb6 PT |
415 | struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh, |
416 | struct vfsmount *mnt, bool connected); | |
8a22efa1 | 417 | int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, |
f941866f | 418 | struct dentry *upperdentry, struct ovl_path **stackp); |
610afc0b | 419 | int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry, |
43d193f8 | 420 | enum ovl_xattr ox, struct dentry *real, bool is_upper, |
610afc0b | 421 | bool set); |
3b0bfc6e | 422 | struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index); |
1eff1a1d | 423 | int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index); |
1cdb0cb6 PT |
424 | int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin, |
425 | struct qstr *name); | |
91ffe7be | 426 | struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh); |
06170154 AG |
427 | struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, |
428 | struct dentry *origin, bool verify); | |
bbb1e54d | 429 | int ovl_path_next(int idx, struct dentry *dentry, struct path *path); |
1eff1a1d AG |
430 | struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, |
431 | unsigned int flags); | |
bbb1e54d | 432 | bool ovl_lower_positive(struct dentry *dentry); |
e9be9d5e | 433 | |
610afc0b | 434 | static inline int ovl_verify_origin(struct ovl_fs *ofs, struct dentry *upper, |
05122443 AG |
435 | struct dentry *origin, bool set) |
436 | { | |
610afc0b MS |
437 | return ovl_verify_set_fh(ofs, upper, OVL_XATTR_ORIGIN, origin, |
438 | false, set); | |
05122443 AG |
439 | } |
440 | ||
610afc0b MS |
441 | static inline int ovl_verify_upper(struct ovl_fs *ofs, struct dentry *index, |
442 | struct dentry *upper, bool set) | |
ad1d615c | 443 | { |
610afc0b | 444 | return ovl_verify_set_fh(ofs, index, OVL_XATTR_UPPER, upper, true, set); |
ad1d615c AG |
445 | } |
446 | ||
e9be9d5e MS |
447 | /* readdir.c */ |
448 | extern const struct file_operations ovl_dir_operations; | |
61536bed | 449 | struct file *ovl_dir_real_file(const struct file *file, bool want_upper); |
e9be9d5e MS |
450 | int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); |
451 | void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); | |
452 | void ovl_cache_free(struct list_head *list); | |
4edb83bb | 453 | void ovl_dir_cache_free(struct inode *inode); |
45aebeaf | 454 | int ovl_check_d_type_supported(struct path *realpath); |
3011645b AG |
455 | int ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt, |
456 | struct dentry *dentry, int level); | |
1eff1a1d | 457 | int ovl_indexdir_cleanup(struct ovl_fs *ofs); |
e9be9d5e | 458 | |
65cd913e AG |
459 | /* |
460 | * Can we iterate real dir directly? | |
461 | * | |
462 | * Non-merge dir may contain whiteouts from a time it was a merge upper, before | |
463 | * lower dir was removed under it and possibly before it was rotated from upper | |
464 | * to lower layer. | |
465 | */ | |
466 | static inline bool ovl_dir_is_real(struct dentry *dir) | |
467 | { | |
468 | return !ovl_test_flag(OVL_WHITEOUTS, d_inode(dir)); | |
469 | } | |
470 | ||
e9be9d5e | 471 | /* inode.c */ |
5f8415d6 AG |
472 | int ovl_set_nlink_upper(struct dentry *dentry); |
473 | int ovl_set_nlink_lower(struct dentry *dentry); | |
610afc0b | 474 | unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry, |
caf70cb2 AG |
475 | struct dentry *upperdentry, |
476 | unsigned int fallback); | |
549c7297 CB |
477 | int ovl_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, |
478 | struct iattr *attr); | |
479 | int ovl_getattr(struct user_namespace *mnt_userns, const struct path *path, | |
480 | struct kstat *stat, u32 request_mask, unsigned int flags); | |
481 | int ovl_permission(struct user_namespace *mnt_userns, struct inode *inode, | |
482 | int mask); | |
1d88f183 MS |
483 | int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name, |
484 | const void *value, size_t size, int flags); | |
485 | int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name, | |
0eb45fc3 | 486 | void *value, size_t size); |
e9be9d5e | 487 | ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); |
39a25b2b | 488 | struct posix_acl *ovl_get_acl(struct inode *inode, int type); |
95582b00 | 489 | int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags); |
610afc0b | 490 | bool ovl_is_private_xattr(struct super_block *sb, const char *name); |
e9be9d5e | 491 | |
ac6a52eb | 492 | struct ovl_inode_params { |
01b39dcc | 493 | struct inode *newinode; |
ac6a52eb VG |
494 | struct dentry *upperdentry; |
495 | struct ovl_path *lowerpath; | |
74c6e384 | 496 | bool index; |
ac6a52eb | 497 | unsigned int numlower; |
9cec54c8 | 498 | char *redirect; |
2664bd08 | 499 | struct dentry *lowerdata; |
ac6a52eb | 500 | }; |
62c832ed AG |
501 | void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip, |
502 | unsigned long ino, int fsid); | |
ca4c8a3a | 503 | struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); |
4b91c30a AG |
504 | struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real, |
505 | bool is_upper); | |
146d62e5 AG |
506 | bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir); |
507 | struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir); | |
ac6a52eb VG |
508 | struct inode *ovl_get_inode(struct super_block *sb, |
509 | struct ovl_inode_params *oip); | |
e9be9d5e MS |
510 | static inline void ovl_copyattr(struct inode *from, struct inode *to) |
511 | { | |
512 | to->i_uid = from->i_uid; | |
513 | to->i_gid = from->i_gid; | |
07a2daab | 514 | to->i_mode = from->i_mode; |
d719e8f2 MS |
515 | to->i_atime = from->i_atime; |
516 | to->i_mtime = from->i_mtime; | |
517 | to->i_ctime = from->i_ctime; | |
46e5d0a3 | 518 | i_size_write(to, i_size_read(from)); |
e9be9d5e MS |
519 | } |
520 | ||
72db8211 AG |
521 | /* vfs inode flags copied from real to ovl inode */ |
522 | #define OVL_COPY_I_FLAGS_MASK (S_SYNC | S_NOATIME | S_APPEND | S_IMMUTABLE) | |
523 | ||
524 | /* | |
525 | * fileattr flags copied from lower to upper inode on copy up. | |
526 | * We cannot copy immutable/append-only flags, because that would prevevnt | |
527 | * linking temp inode to upper dir. | |
528 | */ | |
529 | #define OVL_COPY_FS_FLAGS_MASK (FS_SYNC_FL | FS_NOATIME_FL) | |
530 | #define OVL_COPY_FSX_FLAGS_MASK (FS_XFLAG_SYNC | FS_XFLAG_NOATIME) | |
531 | ||
4f357295 MS |
532 | static inline void ovl_copyflags(struct inode *from, struct inode *to) |
533 | { | |
72db8211 | 534 | unsigned int mask = OVL_COPY_I_FLAGS_MASK; |
4f357295 MS |
535 | |
536 | inode_set_flags(to, from->i_flags & mask, mask); | |
537 | } | |
538 | ||
e9be9d5e MS |
539 | /* dir.c */ |
540 | extern const struct inode_operations ovl_dir_inode_operations; | |
c21c839b | 541 | int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir, |
e7dd0e71 | 542 | struct dentry *dentry); |
471ec5dc | 543 | struct ovl_cattr { |
32a3d848 AV |
544 | dev_t rdev; |
545 | umode_t mode; | |
546 | const char *link; | |
471ec5dc | 547 | struct dentry *hardlink; |
32a3d848 | 548 | }; |
471ec5dc AG |
549 | |
550 | #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) }) | |
551 | ||
95a1c815 MS |
552 | struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry, |
553 | struct ovl_cattr *attr); | |
415543d5 | 554 | int ovl_cleanup(struct inode *dir, struct dentry *dentry); |
cad218ab | 555 | struct dentry *ovl_lookup_temp(struct dentry *workdir); |
137ec526 | 556 | struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr); |
e9be9d5e | 557 | |
d1d04ef8 MS |
558 | /* file.c */ |
559 | extern const struct file_operations ovl_file_operations; | |
2406a307 JX |
560 | int __init ovl_aio_request_cache_init(void); |
561 | void ovl_aio_request_cache_destroy(void); | |
72db8211 AG |
562 | int ovl_real_fileattr_get(struct path *realpath, struct fileattr *fa); |
563 | int ovl_real_fileattr_set(struct path *realpath, struct fileattr *fa); | |
66dbfabf MS |
564 | int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa); |
565 | int ovl_fileattr_set(struct user_namespace *mnt_userns, | |
566 | struct dentry *dentry, struct fileattr *fa); | |
d1d04ef8 | 567 | |
e9be9d5e MS |
568 | /* copy_up.c */ |
569 | int ovl_copy_up(struct dentry *dentry); | |
d1e6f6a9 | 570 | int ovl_copy_up_with_data(struct dentry *dentry); |
3428030d | 571 | int ovl_maybe_copy_up(struct dentry *dentry, int flags); |
610afc0b MS |
572 | int ovl_copy_xattr(struct super_block *sb, struct dentry *old, |
573 | struct dentry *new); | |
e9be9d5e | 574 | int ovl_set_attr(struct dentry *upper, struct kstat *stat); |
1cdb0cb6 PT |
575 | struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real, |
576 | bool is_upper); | |
a0c236b1 AG |
577 | int ovl_set_origin(struct ovl_fs *ofs, struct dentry *lower, |
578 | struct dentry *upper); | |
8ed5eec9 AG |
579 | |
580 | /* export.c */ | |
581 | extern const struct export_operations ovl_export_operations; |