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 | |
fe2b7595 AG |
25 | #define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay." |
26 | #define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque" | |
02b69b28 | 27 | #define OVL_XATTR_REDIRECT OVL_XATTR_PREFIX "redirect" |
3a1e819b | 28 | #define OVL_XATTR_ORIGIN OVL_XATTR_PREFIX "origin" |
ee1d6d37 | 29 | #define OVL_XATTR_IMPURE OVL_XATTR_PREFIX "impure" |
5f8415d6 | 30 | #define OVL_XATTR_NLINK OVL_XATTR_PREFIX "nlink" |
ad1d615c | 31 | #define OVL_XATTR_UPPER OVL_XATTR_PREFIX "upper" |
0c288874 | 32 | #define OVL_XATTR_METACOPY OVL_XATTR_PREFIX "metacopy" |
3a1e819b | 33 | |
c62520a8 | 34 | enum ovl_inode_flag { |
b79e05aa | 35 | /* Pure upper dir that may contain non pure upper entries */ |
13c72075 | 36 | OVL_IMPURE, |
b79e05aa AG |
37 | /* Non-merge dir that may contain whiteout entries */ |
38 | OVL_WHITEOUTS, | |
359f392c | 39 | OVL_INDEX, |
0c288874 | 40 | OVL_UPPERDATA, |
a00c2d59 VG |
41 | /* Inode number will remain constant over copy up. */ |
42 | OVL_CONST_INO, | |
13c72075 MS |
43 | }; |
44 | ||
c62520a8 AG |
45 | enum ovl_entry_flag { |
46 | OVL_E_UPPER_ALIAS, | |
47 | OVL_E_OPAQUE, | |
2ca3c148 | 48 | OVL_E_CONNECTED, |
c62520a8 AG |
49 | }; |
50 | ||
926e94d7 AG |
51 | enum { |
52 | OVL_XINO_OFF, | |
53 | OVL_XINO_AUTO, | |
54 | OVL_XINO_ON, | |
55 | }; | |
56 | ||
3a1e819b AG |
57 | /* |
58 | * The tuple (fh,uuid) is a universal unique identifier for a copy up origin, | |
59 | * where: | |
60 | * origin.fh - exported file handle of the lower file | |
61 | * origin.uuid - uuid of the lower filesystem | |
62 | */ | |
63 | #define OVL_FH_VERSION 0 | |
64 | #define OVL_FH_MAGIC 0xfb | |
65 | ||
66 | /* CPU byte order required for fid decoding: */ | |
67 | #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) | |
68 | #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) | |
54fb347e AG |
69 | /* Is the real inode encoded in fid an upper inode? */ |
70 | #define OVL_FH_FLAG_PATH_UPPER (1 << 2) | |
3a1e819b | 71 | |
961af647 AG |
72 | #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \ |
73 | OVL_FH_FLAG_PATH_UPPER) | |
3a1e819b AG |
74 | |
75 | #if defined(__LITTLE_ENDIAN) | |
76 | #define OVL_FH_FLAG_CPU_ENDIAN 0 | |
77 | #elif defined(__BIG_ENDIAN) | |
78 | #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN | |
79 | #else | |
80 | #error Endianness not defined | |
81 | #endif | |
82 | ||
cbe7fba8 AG |
83 | /* The type used to be returned by overlay exportfs for misaligned fid */ |
84 | #define OVL_FILEID_V0 0xfb | |
85 | /* The type returned by overlay exportfs for 32bit aligned fid */ | |
86 | #define OVL_FILEID_V1 0xf8 | |
8ed5eec9 | 87 | |
cbe7fba8 AG |
88 | /* On-disk format for "origin" file handle */ |
89 | struct ovl_fb { | |
3a1e819b AG |
90 | u8 version; /* 0 */ |
91 | u8 magic; /* 0xfb */ | |
92 | u8 len; /* size of this header + size of fid */ | |
93 | u8 flags; /* OVL_FH_FLAG_* */ | |
94 | u8 type; /* fid_type of fid */ | |
01633fd2 | 95 | uuid_t uuid; /* uuid of filesystem */ |
0efbe7c4 | 96 | u32 fid[]; /* file identifier should be 32bit aligned in-memory */ |
3a1e819b | 97 | } __packed; |
e9be9d5e | 98 | |
cbe7fba8 AG |
99 | /* In-memory and on-wire format for overlay file handle */ |
100 | struct ovl_fh { | |
101 | u8 padding[3]; /* make sure fb.fid is 32bit aligned */ | |
102 | union { | |
103 | struct ovl_fb fb; | |
104 | u8 buf[0]; | |
105 | }; | |
106 | } __packed; | |
107 | ||
108 | #define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb) | |
109 | #define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len) | |
110 | #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \ | |
111 | offsetof(struct ovl_fb, fid)) | |
112 | ||
e9be9d5e MS |
113 | static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry) |
114 | { | |
115 | int err = vfs_rmdir(dir, dentry); | |
6cf00764 | 116 | |
e9be9d5e MS |
117 | pr_debug("rmdir(%pd2) = %i\n", dentry, err); |
118 | return err; | |
119 | } | |
120 | ||
121 | static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry) | |
122 | { | |
123 | int err = vfs_unlink(dir, dentry, NULL); | |
6cf00764 | 124 | |
e9be9d5e MS |
125 | pr_debug("unlink(%pd2) = %i\n", dentry, err); |
126 | return err; | |
127 | } | |
128 | ||
129 | static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir, | |
6cf00764 | 130 | struct dentry *new_dentry) |
e9be9d5e MS |
131 | { |
132 | int err = vfs_link(old_dentry, dir, new_dentry, NULL); | |
6cf00764 AG |
133 | |
134 | pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err); | |
e9be9d5e MS |
135 | return err; |
136 | } | |
137 | ||
138 | static inline int ovl_do_create(struct inode *dir, struct dentry *dentry, | |
6cf00764 | 139 | umode_t mode) |
e9be9d5e MS |
140 | { |
141 | int err = vfs_create(dir, dentry, mode, true); | |
6cf00764 AG |
142 | |
143 | pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); | |
e9be9d5e MS |
144 | return err; |
145 | } | |
146 | ||
147 | static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry, | |
6cf00764 | 148 | umode_t mode) |
e9be9d5e MS |
149 | { |
150 | int err = vfs_mkdir(dir, dentry, mode); | |
6cf00764 | 151 | pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); |
e9be9d5e MS |
152 | return err; |
153 | } | |
154 | ||
155 | static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry, | |
6cf00764 | 156 | umode_t mode, dev_t dev) |
e9be9d5e MS |
157 | { |
158 | int err = vfs_mknod(dir, dentry, mode, dev); | |
6cf00764 AG |
159 | |
160 | pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err); | |
e9be9d5e MS |
161 | return err; |
162 | } | |
163 | ||
164 | static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry, | |
6cf00764 | 165 | const char *oldname) |
e9be9d5e MS |
166 | { |
167 | int err = vfs_symlink(dir, dentry, oldname); | |
6cf00764 AG |
168 | |
169 | pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); | |
e9be9d5e MS |
170 | return err; |
171 | } | |
172 | ||
173 | static inline int ovl_do_setxattr(struct dentry *dentry, const char *name, | |
174 | const void *value, size_t size, int flags) | |
175 | { | |
176 | int err = vfs_setxattr(dentry, name, value, size, flags); | |
1a8f8d2a MS |
177 | pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, 0x%x) = %i\n", |
178 | dentry, name, min((int)size, 48), value, size, flags, err); | |
e9be9d5e MS |
179 | return err; |
180 | } | |
181 | ||
182 | static inline int ovl_do_removexattr(struct dentry *dentry, const char *name) | |
183 | { | |
184 | int err = vfs_removexattr(dentry, name); | |
185 | pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); | |
186 | return err; | |
187 | } | |
188 | ||
189 | static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry, | |
190 | struct inode *newdir, struct dentry *newdentry, | |
191 | unsigned int flags) | |
192 | { | |
193 | int err; | |
194 | ||
6cf00764 | 195 | pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags); |
e9be9d5e | 196 | err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags); |
e9be9d5e | 197 | if (err) { |
2773bf00 | 198 | pr_debug("...rename(%pd2, %pd2, ...) = %i\n", |
e9be9d5e MS |
199 | olddentry, newdentry, err); |
200 | } | |
201 | return err; | |
202 | } | |
203 | ||
204 | static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry) | |
205 | { | |
206 | int err = vfs_whiteout(dir, dentry); | |
207 | pr_debug("whiteout(%pd2) = %i\n", dentry, err); | |
208 | return err; | |
209 | } | |
210 | ||
e7f52429 AG |
211 | static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode) |
212 | { | |
213 | struct dentry *ret = vfs_tmpfile(dentry, mode, 0); | |
7879cb43 | 214 | int err = PTR_ERR_OR_ZERO(ret); |
e7f52429 AG |
215 | |
216 | pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); | |
217 | return ret; | |
218 | } | |
219 | ||
0c288874 VG |
220 | static inline bool ovl_open_flags_need_copy_up(int flags) |
221 | { | |
222 | if (!flags) | |
223 | return false; | |
224 | ||
225 | return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC)); | |
226 | } | |
227 | ||
bbb1e54d MS |
228 | /* util.c */ |
229 | int ovl_want_write(struct dentry *dentry); | |
230 | void ovl_drop_write(struct dentry *dentry); | |
231 | struct dentry *ovl_workdir(struct dentry *dentry); | |
232 | const struct cred *ovl_override_creds(struct super_block *sb); | |
e487d889 | 233 | int ovl_can_decode_fh(struct super_block *sb); |
02bcd157 | 234 | struct dentry *ovl_indexdir(struct super_block *sb); |
f168f109 AG |
235 | bool ovl_index_all(struct super_block *sb); |
236 | bool ovl_verify_lower(struct super_block *sb); | |
bbb1e54d MS |
237 | struct ovl_entry *ovl_alloc_entry(unsigned int numlower); |
238 | bool ovl_dentry_remote(struct dentry *dentry); | |
f4288844 MS |
239 | void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry, |
240 | unsigned int mask); | |
bbb1e54d | 241 | bool ovl_dentry_weird(struct dentry *dentry); |
e9be9d5e | 242 | enum ovl_path_type ovl_path_type(struct dentry *dentry); |
e9be9d5e MS |
243 | void ovl_path_upper(struct dentry *dentry, struct path *path); |
244 | void ovl_path_lower(struct dentry *dentry, struct path *path); | |
4f93b426 | 245 | void ovl_path_lowerdata(struct dentry *dentry, struct path *path); |
e9be9d5e MS |
246 | enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); |
247 | struct dentry *ovl_dentry_upper(struct dentry *dentry); | |
248 | struct dentry *ovl_dentry_lower(struct dentry *dentry); | |
647d253f | 249 | struct dentry *ovl_dentry_lowerdata(struct dentry *dentry); |
13464165 | 250 | const struct ovl_layer *ovl_layer_lower(struct dentry *dentry); |
e9be9d5e | 251 | struct dentry *ovl_dentry_real(struct dentry *dentry); |
1d88f183 | 252 | struct dentry *ovl_i_dentry_upper(struct inode *inode); |
09d8b586 MS |
253 | struct inode *ovl_inode_upper(struct inode *inode); |
254 | struct inode *ovl_inode_lower(struct inode *inode); | |
2664bd08 | 255 | struct inode *ovl_inode_lowerdata(struct inode *inode); |
09d8b586 | 256 | struct inode *ovl_inode_real(struct inode *inode); |
4823d49c | 257 | struct inode *ovl_inode_realdata(struct inode *inode); |
4edb83bb MS |
258 | struct ovl_dir_cache *ovl_dir_cache(struct inode *inode); |
259 | void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache); | |
c62520a8 AG |
260 | void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry); |
261 | void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry); | |
262 | bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry); | |
e9be9d5e | 263 | bool ovl_dentry_is_opaque(struct dentry *dentry); |
c412ce49 | 264 | bool ovl_dentry_is_whiteout(struct dentry *dentry); |
5cf5b477 | 265 | void ovl_dentry_set_opaque(struct dentry *dentry); |
55acc661 MS |
266 | bool ovl_dentry_has_upper_alias(struct dentry *dentry); |
267 | void ovl_dentry_set_upper_alias(struct dentry *dentry); | |
0c288874 VG |
268 | bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags); |
269 | bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags); | |
270 | bool ovl_has_upperdata(struct inode *inode); | |
271 | void ovl_set_upperdata(struct inode *inode); | |
a6c60655 | 272 | bool ovl_redirect_dir(struct super_block *sb); |
a6c60655 MS |
273 | const char *ovl_dentry_get_redirect(struct dentry *dentry); |
274 | void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); | |
09d8b586 | 275 | void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); |
d9854c87 | 276 | void ovl_dir_modified(struct dentry *dentry, bool impurity); |
bbb1e54d MS |
277 | u64 ovl_dentry_version_get(struct dentry *dentry); |
278 | bool ovl_is_whiteout(struct dentry *dentry); | |
e9be9d5e | 279 | struct file *ovl_path_open(struct path *path, int flags); |
0c288874 | 280 | int ovl_copy_up_start(struct dentry *dentry, int flags); |
39d3d60a | 281 | void ovl_copy_up_end(struct dentry *dentry); |
0c288874 | 282 | bool ovl_already_copied_up(struct dentry *dentry, int flags); |
b79e05aa | 283 | bool ovl_check_origin_xattr(struct dentry *dentry); |
f3a15685 AG |
284 | bool ovl_check_dir_xattr(struct dentry *dentry, const char *name); |
285 | int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry, | |
286 | const char *name, const void *value, size_t size, | |
287 | int xerr); | |
288 | int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); | |
13c72075 | 289 | void ovl_set_flag(unsigned long flag, struct inode *inode); |
4edb83bb | 290 | void ovl_clear_flag(unsigned long flag, struct inode *inode); |
13c72075 | 291 | bool ovl_test_flag(unsigned long flag, struct inode *inode); |
ad0af710 AG |
292 | bool ovl_inuse_trylock(struct dentry *dentry); |
293 | void ovl_inuse_unlock(struct dentry *dentry); | |
146d62e5 | 294 | bool ovl_is_inuse(struct dentry *dentry); |
24b33ee1 | 295 | bool ovl_need_index(struct dentry *dentry); |
0e32992f AG |
296 | int ovl_nlink_start(struct dentry *dentry); |
297 | void ovl_nlink_end(struct dentry *dentry); | |
5820dc08 | 298 | int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); |
9d3dfea3 | 299 | int ovl_check_metacopy_xattr(struct dentry *dentry); |
67d756c2 | 300 | bool ovl_is_metacopy_dentry(struct dentry *dentry); |
0a2d0d3f | 301 | char *ovl_get_redirect_xattr(struct dentry *dentry, int padding); |
f3a15685 AG |
302 | |
303 | static inline bool ovl_is_impuredir(struct dentry *dentry) | |
304 | { | |
305 | return ovl_check_dir_xattr(dentry, OVL_XATTR_IMPURE); | |
306 | } | |
307 | ||
926e94d7 AG |
308 | /* |
309 | * With xino=auto, we do best effort to keep all inodes on same st_dev and | |
310 | * d_ino consistent with st_ino. | |
311 | * With xino=on, we do the same effort but we warn if we failed. | |
312 | */ | |
313 | static inline bool ovl_xino_warn(struct super_block *sb) | |
314 | { | |
315 | return OVL_FS(sb)->config.xino == OVL_XINO_ON; | |
316 | } | |
317 | ||
0f831ec8 AG |
318 | /* All layers on same fs? */ |
319 | static inline bool ovl_same_fs(struct super_block *sb) | |
e487d889 | 320 | { |
0f831ec8 AG |
321 | return OVL_FS(sb)->xino_mode == 0; |
322 | } | |
e487d889 | 323 | |
0f831ec8 AG |
324 | /* All overlay inodes have same st_dev? */ |
325 | static inline bool ovl_same_dev(struct super_block *sb) | |
326 | { | |
327 | return OVL_FS(sb)->xino_mode >= 0; | |
328 | } | |
329 | ||
330 | static inline unsigned int ovl_xino_bits(struct super_block *sb) | |
331 | { | |
332 | return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0; | |
e487d889 AG |
333 | } |
334 | ||
531d3040 AG |
335 | static inline void ovl_inode_lock(struct inode *inode) |
336 | { | |
337 | mutex_lock(&OVL_I(inode)->lock); | |
338 | } | |
339 | ||
340 | static inline int ovl_inode_lock_interruptible(struct inode *inode) | |
1e92e307 AG |
341 | { |
342 | return mutex_lock_interruptible(&OVL_I(inode)->lock); | |
343 | } | |
344 | ||
345 | static inline void ovl_inode_unlock(struct inode *inode) | |
346 | { | |
347 | mutex_unlock(&OVL_I(inode)->lock); | |
348 | } | |
349 | ||
e9be9d5e | 350 | |
bbb1e54d | 351 | /* namei.c */ |
cbe7fba8 AG |
352 | int ovl_check_fb_len(struct ovl_fb *fb, int fb_len); |
353 | ||
354 | static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len) | |
355 | { | |
522f6e6c AG |
356 | if (fh_len < sizeof(struct ovl_fh)) |
357 | return -EINVAL; | |
358 | ||
cbe7fba8 AG |
359 | return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET); |
360 | } | |
361 | ||
8a22efa1 AG |
362 | struct dentry *ovl_decode_real_fh(struct ovl_fh *fh, struct vfsmount *mnt, |
363 | bool connected); | |
364 | int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, | |
f941866f | 365 | struct dentry *upperdentry, struct ovl_path **stackp); |
05122443 AG |
366 | int ovl_verify_set_fh(struct dentry *dentry, const char *name, |
367 | struct dentry *real, bool is_upper, bool set); | |
3b0bfc6e | 368 | struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index); |
1eff1a1d | 369 | int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index); |
359f392c | 370 | int ovl_get_index_name(struct dentry *origin, struct qstr *name); |
91ffe7be | 371 | struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh); |
06170154 AG |
372 | struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, |
373 | struct dentry *origin, bool verify); | |
bbb1e54d | 374 | int ovl_path_next(int idx, struct dentry *dentry, struct path *path); |
1eff1a1d AG |
375 | struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, |
376 | unsigned int flags); | |
bbb1e54d | 377 | bool ovl_lower_positive(struct dentry *dentry); |
e9be9d5e | 378 | |
05122443 AG |
379 | static inline int ovl_verify_origin(struct dentry *upper, |
380 | struct dentry *origin, bool set) | |
381 | { | |
382 | return ovl_verify_set_fh(upper, OVL_XATTR_ORIGIN, origin, false, set); | |
383 | } | |
384 | ||
ad1d615c AG |
385 | static inline int ovl_verify_upper(struct dentry *index, |
386 | struct dentry *upper, bool set) | |
387 | { | |
388 | return ovl_verify_set_fh(index, OVL_XATTR_UPPER, upper, true, set); | |
389 | } | |
390 | ||
e9be9d5e MS |
391 | /* readdir.c */ |
392 | extern const struct file_operations ovl_dir_operations; | |
393 | int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); | |
394 | void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); | |
395 | void ovl_cache_free(struct list_head *list); | |
4edb83bb | 396 | void ovl_dir_cache_free(struct inode *inode); |
45aebeaf | 397 | int ovl_check_d_type_supported(struct path *realpath); |
3011645b AG |
398 | int ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt, |
399 | struct dentry *dentry, int level); | |
1eff1a1d | 400 | int ovl_indexdir_cleanup(struct ovl_fs *ofs); |
e9be9d5e MS |
401 | |
402 | /* inode.c */ | |
5f8415d6 AG |
403 | int ovl_set_nlink_upper(struct dentry *dentry); |
404 | int ovl_set_nlink_lower(struct dentry *dentry); | |
caf70cb2 AG |
405 | unsigned int ovl_get_nlink(struct dentry *lowerdentry, |
406 | struct dentry *upperdentry, | |
407 | unsigned int fallback); | |
e9be9d5e | 408 | int ovl_setattr(struct dentry *dentry, struct iattr *attr); |
5b712091 MS |
409 | int ovl_getattr(const struct path *path, struct kstat *stat, |
410 | u32 request_mask, unsigned int flags); | |
e9be9d5e | 411 | int ovl_permission(struct inode *inode, int mask); |
1d88f183 MS |
412 | int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name, |
413 | const void *value, size_t size, int flags); | |
414 | int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name, | |
0eb45fc3 | 415 | void *value, size_t size); |
e9be9d5e | 416 | ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); |
39a25b2b | 417 | struct posix_acl *ovl_get_acl(struct inode *inode, int type); |
95582b00 | 418 | int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags); |
0956254a | 419 | bool ovl_is_private_xattr(const char *name); |
e9be9d5e | 420 | |
ac6a52eb | 421 | struct ovl_inode_params { |
01b39dcc | 422 | struct inode *newinode; |
ac6a52eb VG |
423 | struct dentry *upperdentry; |
424 | struct ovl_path *lowerpath; | |
74c6e384 | 425 | bool index; |
ac6a52eb | 426 | unsigned int numlower; |
9cec54c8 | 427 | char *redirect; |
2664bd08 | 428 | struct dentry *lowerdata; |
ac6a52eb | 429 | }; |
62c832ed AG |
430 | void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip, |
431 | unsigned long ino, int fsid); | |
ca4c8a3a | 432 | struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); |
4b91c30a AG |
433 | struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real, |
434 | bool is_upper); | |
146d62e5 AG |
435 | bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir); |
436 | struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir); | |
ac6a52eb VG |
437 | struct inode *ovl_get_inode(struct super_block *sb, |
438 | struct ovl_inode_params *oip); | |
e9be9d5e MS |
439 | static inline void ovl_copyattr(struct inode *from, struct inode *to) |
440 | { | |
441 | to->i_uid = from->i_uid; | |
442 | to->i_gid = from->i_gid; | |
07a2daab | 443 | to->i_mode = from->i_mode; |
d719e8f2 MS |
444 | to->i_atime = from->i_atime; |
445 | to->i_mtime = from->i_mtime; | |
446 | to->i_ctime = from->i_ctime; | |
46e5d0a3 | 447 | i_size_write(to, i_size_read(from)); |
e9be9d5e MS |
448 | } |
449 | ||
4f357295 MS |
450 | static inline void ovl_copyflags(struct inode *from, struct inode *to) |
451 | { | |
452 | unsigned int mask = S_SYNC | S_IMMUTABLE | S_APPEND | S_NOATIME; | |
453 | ||
454 | inode_set_flags(to, from->i_flags & mask, mask); | |
455 | } | |
456 | ||
e9be9d5e MS |
457 | /* dir.c */ |
458 | extern const struct inode_operations ovl_dir_inode_operations; | |
c21c839b | 459 | int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir, |
e7dd0e71 | 460 | struct dentry *dentry); |
471ec5dc | 461 | struct ovl_cattr { |
32a3d848 AV |
462 | dev_t rdev; |
463 | umode_t mode; | |
464 | const char *link; | |
471ec5dc | 465 | struct dentry *hardlink; |
32a3d848 | 466 | }; |
471ec5dc AG |
467 | |
468 | #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) }) | |
469 | ||
95a1c815 MS |
470 | struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry, |
471 | struct ovl_cattr *attr); | |
415543d5 | 472 | int ovl_cleanup(struct inode *dir, struct dentry *dentry); |
cad218ab | 473 | struct dentry *ovl_lookup_temp(struct dentry *workdir); |
137ec526 | 474 | struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr); |
e9be9d5e | 475 | |
d1d04ef8 MS |
476 | /* file.c */ |
477 | extern const struct file_operations ovl_file_operations; | |
2406a307 JX |
478 | int __init ovl_aio_request_cache_init(void); |
479 | void ovl_aio_request_cache_destroy(void); | |
d1d04ef8 | 480 | |
e9be9d5e MS |
481 | /* copy_up.c */ |
482 | int ovl_copy_up(struct dentry *dentry); | |
d1e6f6a9 | 483 | int ovl_copy_up_with_data(struct dentry *dentry); |
3428030d | 484 | int ovl_maybe_copy_up(struct dentry *dentry, int flags); |
e9be9d5e MS |
485 | int ovl_copy_xattr(struct dentry *old, struct dentry *new); |
486 | int ovl_set_attr(struct dentry *upper, struct kstat *stat); | |
5b2cccd3 | 487 | struct ovl_fh *ovl_encode_real_fh(struct dentry *real, bool is_upper); |
9678e630 AG |
488 | int ovl_set_origin(struct dentry *dentry, struct dentry *lower, |
489 | struct dentry *upper); | |
8ed5eec9 AG |
490 | |
491 | /* export.c */ | |
492 | extern const struct export_operations ovl_export_operations; |