Commit | Line | Data |
---|---|---|
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 | ||
3a1e819b AG |
51 | /* |
52 | * The tuple (fh,uuid) is a universal unique identifier for a copy up origin, | |
53 | * where: | |
54 | * origin.fh - exported file handle of the lower file | |
55 | * origin.uuid - uuid of the lower filesystem | |
56 | */ | |
57 | #define OVL_FH_VERSION 0 | |
58 | #define OVL_FH_MAGIC 0xfb | |
59 | ||
60 | /* CPU byte order required for fid decoding: */ | |
61 | #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) | |
62 | #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) | |
54fb347e AG |
63 | /* Is the real inode encoded in fid an upper inode? */ |
64 | #define OVL_FH_FLAG_PATH_UPPER (1 << 2) | |
3a1e819b | 65 | |
961af647 AG |
66 | #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \ |
67 | OVL_FH_FLAG_PATH_UPPER) | |
3a1e819b AG |
68 | |
69 | #if defined(__LITTLE_ENDIAN) | |
70 | #define OVL_FH_FLAG_CPU_ENDIAN 0 | |
71 | #elif defined(__BIG_ENDIAN) | |
72 | #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN | |
73 | #else | |
74 | #error Endianness not defined | |
75 | #endif | |
76 | ||
cbe7fba8 AG |
77 | /* The type used to be returned by overlay exportfs for misaligned fid */ |
78 | #define OVL_FILEID_V0 0xfb | |
79 | /* The type returned by overlay exportfs for 32bit aligned fid */ | |
80 | #define OVL_FILEID_V1 0xf8 | |
8ed5eec9 | 81 | |
cbe7fba8 AG |
82 | /* On-disk format for "origin" file handle */ |
83 | struct ovl_fb { | |
3a1e819b AG |
84 | u8 version; /* 0 */ |
85 | u8 magic; /* 0xfb */ | |
86 | u8 len; /* size of this header + size of fid */ | |
87 | u8 flags; /* OVL_FH_FLAG_* */ | |
88 | u8 type; /* fid_type of fid */ | |
01633fd2 | 89 | uuid_t uuid; /* uuid of filesystem */ |
cbe7fba8 | 90 | u32 fid[0]; /* file identifier should be 32bit aligned in-memory */ |
3a1e819b | 91 | } __packed; |
e9be9d5e | 92 | |
cbe7fba8 AG |
93 | /* In-memory and on-wire format for overlay file handle */ |
94 | struct ovl_fh { | |
95 | u8 padding[3]; /* make sure fb.fid is 32bit aligned */ | |
96 | union { | |
97 | struct ovl_fb fb; | |
98 | u8 buf[0]; | |
99 | }; | |
100 | } __packed; | |
101 | ||
102 | #define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb) | |
103 | #define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len) | |
104 | #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \ | |
105 | offsetof(struct ovl_fb, fid)) | |
106 | ||
e9be9d5e MS |
107 | static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry) |
108 | { | |
109 | int err = vfs_rmdir(dir, dentry); | |
6cf00764 | 110 | |
e9be9d5e MS |
111 | pr_debug("rmdir(%pd2) = %i\n", dentry, err); |
112 | return err; | |
113 | } | |
114 | ||
115 | static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry) | |
116 | { | |
117 | int err = vfs_unlink(dir, dentry, NULL); | |
6cf00764 | 118 | |
e9be9d5e MS |
119 | pr_debug("unlink(%pd2) = %i\n", dentry, err); |
120 | return err; | |
121 | } | |
122 | ||
123 | static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir, | |
6cf00764 | 124 | struct dentry *new_dentry) |
e9be9d5e MS |
125 | { |
126 | int err = vfs_link(old_dentry, dir, new_dentry, NULL); | |
6cf00764 AG |
127 | |
128 | pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err); | |
e9be9d5e MS |
129 | return err; |
130 | } | |
131 | ||
132 | static inline int ovl_do_create(struct inode *dir, struct dentry *dentry, | |
6cf00764 | 133 | umode_t mode) |
e9be9d5e MS |
134 | { |
135 | int err = vfs_create(dir, dentry, mode, true); | |
6cf00764 AG |
136 | |
137 | pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); | |
e9be9d5e MS |
138 | return err; |
139 | } | |
140 | ||
141 | static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry, | |
6cf00764 | 142 | umode_t mode) |
e9be9d5e MS |
143 | { |
144 | int err = vfs_mkdir(dir, dentry, mode); | |
6cf00764 | 145 | pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); |
e9be9d5e MS |
146 | return err; |
147 | } | |
148 | ||
149 | static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry, | |
6cf00764 | 150 | umode_t mode, dev_t dev) |
e9be9d5e MS |
151 | { |
152 | int err = vfs_mknod(dir, dentry, mode, dev); | |
6cf00764 AG |
153 | |
154 | pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err); | |
e9be9d5e MS |
155 | return err; |
156 | } | |
157 | ||
158 | static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry, | |
6cf00764 | 159 | const char *oldname) |
e9be9d5e MS |
160 | { |
161 | int err = vfs_symlink(dir, dentry, oldname); | |
6cf00764 AG |
162 | |
163 | pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); | |
e9be9d5e MS |
164 | return err; |
165 | } | |
166 | ||
167 | static inline int ovl_do_setxattr(struct dentry *dentry, const char *name, | |
168 | const void *value, size_t size, int flags) | |
169 | { | |
170 | int err = vfs_setxattr(dentry, name, value, size, flags); | |
1a8f8d2a MS |
171 | pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, 0x%x) = %i\n", |
172 | dentry, name, min((int)size, 48), value, size, flags, err); | |
e9be9d5e MS |
173 | return err; |
174 | } | |
175 | ||
176 | static inline int ovl_do_removexattr(struct dentry *dentry, const char *name) | |
177 | { | |
178 | int err = vfs_removexattr(dentry, name); | |
179 | pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); | |
180 | return err; | |
181 | } | |
182 | ||
183 | static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry, | |
184 | struct inode *newdir, struct dentry *newdentry, | |
185 | unsigned int flags) | |
186 | { | |
187 | int err; | |
188 | ||
6cf00764 | 189 | pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags); |
e9be9d5e | 190 | err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags); |
e9be9d5e | 191 | if (err) { |
2773bf00 | 192 | pr_debug("...rename(%pd2, %pd2, ...) = %i\n", |
e9be9d5e MS |
193 | olddentry, newdentry, err); |
194 | } | |
195 | return err; | |
196 | } | |
197 | ||
198 | static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry) | |
199 | { | |
200 | int err = vfs_whiteout(dir, dentry); | |
201 | pr_debug("whiteout(%pd2) = %i\n", dentry, err); | |
202 | return err; | |
203 | } | |
204 | ||
e7f52429 AG |
205 | static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode) |
206 | { | |
207 | struct dentry *ret = vfs_tmpfile(dentry, mode, 0); | |
7879cb43 | 208 | int err = PTR_ERR_OR_ZERO(ret); |
e7f52429 AG |
209 | |
210 | pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); | |
211 | return ret; | |
212 | } | |
213 | ||
0c288874 VG |
214 | static inline bool ovl_open_flags_need_copy_up(int flags) |
215 | { | |
216 | if (!flags) | |
217 | return false; | |
218 | ||
219 | return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC)); | |
220 | } | |
221 | ||
bbb1e54d MS |
222 | /* util.c */ |
223 | int ovl_want_write(struct dentry *dentry); | |
224 | void ovl_drop_write(struct dentry *dentry); | |
225 | struct dentry *ovl_workdir(struct dentry *dentry); | |
226 | const struct cred *ovl_override_creds(struct super_block *sb); | |
e487d889 | 227 | int ovl_can_decode_fh(struct super_block *sb); |
02bcd157 | 228 | struct dentry *ovl_indexdir(struct super_block *sb); |
f168f109 AG |
229 | bool ovl_index_all(struct super_block *sb); |
230 | bool ovl_verify_lower(struct super_block *sb); | |
bbb1e54d MS |
231 | struct ovl_entry *ovl_alloc_entry(unsigned int numlower); |
232 | bool ovl_dentry_remote(struct dentry *dentry); | |
233 | bool ovl_dentry_weird(struct dentry *dentry); | |
e9be9d5e | 234 | enum ovl_path_type ovl_path_type(struct dentry *dentry); |
e9be9d5e MS |
235 | void ovl_path_upper(struct dentry *dentry, struct path *path); |
236 | void ovl_path_lower(struct dentry *dentry, struct path *path); | |
4f93b426 | 237 | void ovl_path_lowerdata(struct dentry *dentry, struct path *path); |
e9be9d5e MS |
238 | enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); |
239 | struct dentry *ovl_dentry_upper(struct dentry *dentry); | |
240 | struct dentry *ovl_dentry_lower(struct dentry *dentry); | |
647d253f | 241 | struct dentry *ovl_dentry_lowerdata(struct dentry *dentry); |
da309e8c | 242 | struct ovl_layer *ovl_layer_lower(struct dentry *dentry); |
e9be9d5e | 243 | struct dentry *ovl_dentry_real(struct dentry *dentry); |
1d88f183 | 244 | struct dentry *ovl_i_dentry_upper(struct inode *inode); |
09d8b586 MS |
245 | struct inode *ovl_inode_upper(struct inode *inode); |
246 | struct inode *ovl_inode_lower(struct inode *inode); | |
2664bd08 | 247 | struct inode *ovl_inode_lowerdata(struct inode *inode); |
09d8b586 | 248 | struct inode *ovl_inode_real(struct inode *inode); |
4823d49c | 249 | struct inode *ovl_inode_realdata(struct inode *inode); |
4edb83bb MS |
250 | struct ovl_dir_cache *ovl_dir_cache(struct inode *inode); |
251 | void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache); | |
c62520a8 AG |
252 | void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry); |
253 | void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry); | |
254 | bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry); | |
e9be9d5e | 255 | bool ovl_dentry_is_opaque(struct dentry *dentry); |
c412ce49 | 256 | bool ovl_dentry_is_whiteout(struct dentry *dentry); |
5cf5b477 | 257 | void ovl_dentry_set_opaque(struct dentry *dentry); |
55acc661 MS |
258 | bool ovl_dentry_has_upper_alias(struct dentry *dentry); |
259 | void ovl_dentry_set_upper_alias(struct dentry *dentry); | |
0c288874 VG |
260 | bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags); |
261 | bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags); | |
262 | bool ovl_has_upperdata(struct inode *inode); | |
263 | void ovl_set_upperdata(struct inode *inode); | |
a6c60655 | 264 | bool ovl_redirect_dir(struct super_block *sb); |
a6c60655 MS |
265 | const char *ovl_dentry_get_redirect(struct dentry *dentry); |
266 | void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); | |
09d8b586 | 267 | void ovl_inode_init(struct inode *inode, struct dentry *upperdentry, |
2664bd08 | 268 | struct dentry *lowerdentry, struct dentry *lowerdata); |
09d8b586 | 269 | void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); |
d9854c87 | 270 | void ovl_dir_modified(struct dentry *dentry, bool impurity); |
bbb1e54d MS |
271 | u64 ovl_dentry_version_get(struct dentry *dentry); |
272 | bool ovl_is_whiteout(struct dentry *dentry); | |
e9be9d5e | 273 | struct file *ovl_path_open(struct path *path, int flags); |
0c288874 | 274 | int ovl_copy_up_start(struct dentry *dentry, int flags); |
39d3d60a | 275 | void ovl_copy_up_end(struct dentry *dentry); |
0c288874 | 276 | bool ovl_already_copied_up(struct dentry *dentry, int flags); |
b79e05aa | 277 | bool ovl_check_origin_xattr(struct dentry *dentry); |
f3a15685 AG |
278 | bool ovl_check_dir_xattr(struct dentry *dentry, const char *name); |
279 | int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry, | |
280 | const char *name, const void *value, size_t size, | |
281 | int xerr); | |
282 | int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); | |
13c72075 | 283 | void ovl_set_flag(unsigned long flag, struct inode *inode); |
4edb83bb | 284 | void ovl_clear_flag(unsigned long flag, struct inode *inode); |
13c72075 | 285 | bool ovl_test_flag(unsigned long flag, struct inode *inode); |
ad0af710 AG |
286 | bool ovl_inuse_trylock(struct dentry *dentry); |
287 | void ovl_inuse_unlock(struct dentry *dentry); | |
146d62e5 | 288 | bool ovl_is_inuse(struct dentry *dentry); |
24b33ee1 | 289 | bool ovl_need_index(struct dentry *dentry); |
0e32992f AG |
290 | int ovl_nlink_start(struct dentry *dentry); |
291 | void ovl_nlink_end(struct dentry *dentry); | |
5820dc08 | 292 | int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); |
9d3dfea3 | 293 | int ovl_check_metacopy_xattr(struct dentry *dentry); |
67d756c2 | 294 | bool ovl_is_metacopy_dentry(struct dentry *dentry); |
0a2d0d3f | 295 | char *ovl_get_redirect_xattr(struct dentry *dentry, int padding); |
993a0b2a VG |
296 | ssize_t ovl_getxattr(struct dentry *dentry, char *name, char **value, |
297 | size_t padding); | |
f3a15685 AG |
298 | |
299 | static inline bool ovl_is_impuredir(struct dentry *dentry) | |
300 | { | |
301 | return ovl_check_dir_xattr(dentry, OVL_XATTR_IMPURE); | |
302 | } | |
303 | ||
0f831ec8 AG |
304 | /* All layers on same fs? */ |
305 | static inline bool ovl_same_fs(struct super_block *sb) | |
e487d889 | 306 | { |
0f831ec8 AG |
307 | return OVL_FS(sb)->xino_mode == 0; |
308 | } | |
e487d889 | 309 | |
0f831ec8 AG |
310 | /* All overlay inodes have same st_dev? */ |
311 | static inline bool ovl_same_dev(struct super_block *sb) | |
312 | { | |
313 | return OVL_FS(sb)->xino_mode >= 0; | |
314 | } | |
315 | ||
316 | static inline unsigned int ovl_xino_bits(struct super_block *sb) | |
317 | { | |
318 | return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0; | |
e487d889 AG |
319 | } |
320 | ||
1e92e307 AG |
321 | static inline int ovl_inode_lock(struct inode *inode) |
322 | { | |
323 | return mutex_lock_interruptible(&OVL_I(inode)->lock); | |
324 | } | |
325 | ||
326 | static inline void ovl_inode_unlock(struct inode *inode) | |
327 | { | |
328 | mutex_unlock(&OVL_I(inode)->lock); | |
329 | } | |
330 | ||
e9be9d5e | 331 | |
bbb1e54d | 332 | /* namei.c */ |
cbe7fba8 AG |
333 | int ovl_check_fb_len(struct ovl_fb *fb, int fb_len); |
334 | ||
335 | static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len) | |
336 | { | |
337 | return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET); | |
338 | } | |
339 | ||
8a22efa1 AG |
340 | struct dentry *ovl_decode_real_fh(struct ovl_fh *fh, struct vfsmount *mnt, |
341 | bool connected); | |
342 | int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, | |
f941866f | 343 | struct dentry *upperdentry, struct ovl_path **stackp); |
05122443 AG |
344 | int ovl_verify_set_fh(struct dentry *dentry, const char *name, |
345 | struct dentry *real, bool is_upper, bool set); | |
3b0bfc6e | 346 | struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index); |
1eff1a1d | 347 | int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index); |
359f392c | 348 | int ovl_get_index_name(struct dentry *origin, struct qstr *name); |
91ffe7be | 349 | struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh); |
06170154 AG |
350 | struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, |
351 | struct dentry *origin, bool verify); | |
bbb1e54d | 352 | int ovl_path_next(int idx, struct dentry *dentry, struct path *path); |
1eff1a1d AG |
353 | struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, |
354 | unsigned int flags); | |
bbb1e54d | 355 | bool ovl_lower_positive(struct dentry *dentry); |
e9be9d5e | 356 | |
05122443 AG |
357 | static inline int ovl_verify_origin(struct dentry *upper, |
358 | struct dentry *origin, bool set) | |
359 | { | |
360 | return ovl_verify_set_fh(upper, OVL_XATTR_ORIGIN, origin, false, set); | |
361 | } | |
362 | ||
ad1d615c AG |
363 | static inline int ovl_verify_upper(struct dentry *index, |
364 | struct dentry *upper, bool set) | |
365 | { | |
366 | return ovl_verify_set_fh(index, OVL_XATTR_UPPER, upper, true, set); | |
367 | } | |
368 | ||
e9be9d5e MS |
369 | /* readdir.c */ |
370 | extern const struct file_operations ovl_dir_operations; | |
371 | int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); | |
372 | void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); | |
373 | void ovl_cache_free(struct list_head *list); | |
4edb83bb | 374 | void ovl_dir_cache_free(struct inode *inode); |
45aebeaf | 375 | int ovl_check_d_type_supported(struct path *realpath); |
eea2fb48 MS |
376 | void ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt, |
377 | struct dentry *dentry, int level); | |
1eff1a1d | 378 | int ovl_indexdir_cleanup(struct ovl_fs *ofs); |
e9be9d5e MS |
379 | |
380 | /* inode.c */ | |
5f8415d6 AG |
381 | int ovl_set_nlink_upper(struct dentry *dentry); |
382 | int ovl_set_nlink_lower(struct dentry *dentry); | |
caf70cb2 AG |
383 | unsigned int ovl_get_nlink(struct dentry *lowerdentry, |
384 | struct dentry *upperdentry, | |
385 | unsigned int fallback); | |
e9be9d5e | 386 | int ovl_setattr(struct dentry *dentry, struct iattr *attr); |
5b712091 MS |
387 | int ovl_getattr(const struct path *path, struct kstat *stat, |
388 | u32 request_mask, unsigned int flags); | |
e9be9d5e | 389 | int ovl_permission(struct inode *inode, int mask); |
1d88f183 MS |
390 | int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name, |
391 | const void *value, size_t size, int flags); | |
392 | int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name, | |
0eb45fc3 | 393 | void *value, size_t size); |
e9be9d5e | 394 | ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); |
39a25b2b | 395 | struct posix_acl *ovl_get_acl(struct inode *inode, int type); |
95582b00 | 396 | int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags); |
0956254a | 397 | bool ovl_is_private_xattr(const char *name); |
e9be9d5e | 398 | |
ac6a52eb | 399 | struct ovl_inode_params { |
01b39dcc | 400 | struct inode *newinode; |
ac6a52eb VG |
401 | struct dentry *upperdentry; |
402 | struct ovl_path *lowerpath; | |
403 | struct dentry *index; | |
404 | unsigned int numlower; | |
9cec54c8 | 405 | char *redirect; |
2664bd08 | 406 | struct dentry *lowerdata; |
ac6a52eb | 407 | }; |
ca4c8a3a | 408 | struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); |
4b91c30a AG |
409 | struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real, |
410 | bool is_upper); | |
146d62e5 AG |
411 | bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir); |
412 | struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir); | |
ac6a52eb VG |
413 | struct inode *ovl_get_inode(struct super_block *sb, |
414 | struct ovl_inode_params *oip); | |
e9be9d5e MS |
415 | static inline void ovl_copyattr(struct inode *from, struct inode *to) |
416 | { | |
417 | to->i_uid = from->i_uid; | |
418 | to->i_gid = from->i_gid; | |
07a2daab | 419 | to->i_mode = from->i_mode; |
d719e8f2 MS |
420 | to->i_atime = from->i_atime; |
421 | to->i_mtime = from->i_mtime; | |
422 | to->i_ctime = from->i_ctime; | |
46e5d0a3 | 423 | i_size_write(to, i_size_read(from)); |
e9be9d5e MS |
424 | } |
425 | ||
4f357295 MS |
426 | static inline void ovl_copyflags(struct inode *from, struct inode *to) |
427 | { | |
428 | unsigned int mask = S_SYNC | S_IMMUTABLE | S_APPEND | S_NOATIME; | |
429 | ||
430 | inode_set_flags(to, from->i_flags & mask, mask); | |
431 | } | |
432 | ||
e9be9d5e MS |
433 | /* dir.c */ |
434 | extern const struct inode_operations ovl_dir_inode_operations; | |
e7dd0e71 AG |
435 | int ovl_cleanup_and_whiteout(struct dentry *workdir, struct inode *dir, |
436 | struct dentry *dentry); | |
471ec5dc | 437 | struct ovl_cattr { |
32a3d848 AV |
438 | dev_t rdev; |
439 | umode_t mode; | |
440 | const char *link; | |
471ec5dc | 441 | struct dentry *hardlink; |
32a3d848 | 442 | }; |
471ec5dc AG |
443 | |
444 | #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) }) | |
445 | ||
95a1c815 MS |
446 | struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry, |
447 | struct ovl_cattr *attr); | |
415543d5 | 448 | int ovl_cleanup(struct inode *dir, struct dentry *dentry); |
137ec526 | 449 | struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr); |
e9be9d5e | 450 | |
d1d04ef8 MS |
451 | /* file.c */ |
452 | extern const struct file_operations ovl_file_operations; | |
453 | ||
e9be9d5e MS |
454 | /* copy_up.c */ |
455 | int ovl_copy_up(struct dentry *dentry); | |
d1e6f6a9 | 456 | int ovl_copy_up_with_data(struct dentry *dentry); |
9aba6521 | 457 | int ovl_copy_up_flags(struct dentry *dentry, int flags); |
3428030d | 458 | int ovl_maybe_copy_up(struct dentry *dentry, int flags); |
e9be9d5e MS |
459 | int ovl_copy_xattr(struct dentry *old, struct dentry *new); |
460 | int ovl_set_attr(struct dentry *upper, struct kstat *stat); | |
5b2cccd3 | 461 | struct ovl_fh *ovl_encode_real_fh(struct dentry *real, bool is_upper); |
9678e630 AG |
462 | int ovl_set_origin(struct dentry *dentry, struct dentry *lower, |
463 | struct dentry *upper); | |
8ed5eec9 AG |
464 | |
465 | /* export.c */ | |
466 | extern const struct export_operations ovl_export_operations; |