1 /* SPDX-License-Identifier: GPL-2.0-only */
4 * Copyright (C) 2011 Novell Inc.
7 #include <linux/kernel.h>
8 #include <linux/uuid.h>
10 #include <linux/namei.h>
11 #include "ovl_entry.h"
14 #define pr_fmt(fmt) "overlayfs: " fmt
17 __OVL_PATH_UPPER = (1 << 0),
18 __OVL_PATH_MERGE = (1 << 1),
19 __OVL_PATH_ORIGIN = (1 << 2),
22 #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER)
23 #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE)
24 #define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN)
26 #define OVL_XATTR_NAMESPACE "overlay."
27 #define OVL_XATTR_TRUSTED_PREFIX XATTR_TRUSTED_PREFIX OVL_XATTR_NAMESPACE
28 #define OVL_XATTR_USER_PREFIX XATTR_USER_PREFIX OVL_XATTR_NAMESPACE
42 /* Pure upper dir that may contain non pure upper entries */
44 /* Non-merge dir that may contain whiteout entries */
48 /* Inode number will remain constant over copy up. */
65 * The tuple (fh,uuid) is a universal unique identifier for a copy up origin,
67 * origin.fh - exported file handle of the lower file
68 * origin.uuid - uuid of the lower filesystem
70 #define OVL_FH_VERSION 0
71 #define OVL_FH_MAGIC 0xfb
73 /* CPU byte order required for fid decoding: */
74 #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0)
75 #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1)
76 /* Is the real inode encoded in fid an upper inode? */
77 #define OVL_FH_FLAG_PATH_UPPER (1 << 2)
79 #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \
80 OVL_FH_FLAG_PATH_UPPER)
82 #if defined(__LITTLE_ENDIAN)
83 #define OVL_FH_FLAG_CPU_ENDIAN 0
84 #elif defined(__BIG_ENDIAN)
85 #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN
87 #error Endianness not defined
90 /* The type used to be returned by overlay exportfs for misaligned fid */
91 #define OVL_FILEID_V0 0xfb
92 /* The type returned by overlay exportfs for 32bit aligned fid */
93 #define OVL_FILEID_V1 0xf8
95 /* On-disk format for "origin" file handle */
99 u8 len; /* size of this header + size of fid */
100 u8 flags; /* OVL_FH_FLAG_* */
101 u8 type; /* fid_type of fid */
102 uuid_t uuid; /* uuid of filesystem */
103 u32 fid[]; /* file identifier should be 32bit aligned in-memory */
106 /* In-memory and on-wire format for overlay file handle */
108 u8 padding[3]; /* make sure fb.fid is 32bit aligned */
115 #define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb)
116 #define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len)
117 #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \
118 offsetof(struct ovl_fb, fid))
120 extern const char *const ovl_xattr_table[][2];
121 static inline const char *ovl_xattr(struct ovl_fs *ofs, enum ovl_xattr ox)
123 return ovl_xattr_table[ox][ofs->config.userxattr];
127 * When changing ownership of an upper object map the intended ownership
128 * according to the upper layer's idmapping. When an upper mount idmaps files
129 * that are stored on-disk as owned by id 1001 to id 1000 this means stat on
130 * this object will report it as being owned by id 1000 when calling stat via
132 * In order to change ownership of an object so stat reports id 1000 when
133 * called on an idmapped upper mount the value written to disk - i.e., the
134 * value stored in ia_*id - must 1001. The mount mapping helper will thus take
135 * care to map 1000 to 1001.
136 * The mnt idmapping helpers are nops if the upper layer isn't idmapped.
138 static inline int ovl_do_notify_change(struct ovl_fs *ofs,
139 struct dentry *upperdentry,
142 struct user_namespace *upper_mnt_userns = ovl_upper_mnt_userns(ofs);
143 struct user_namespace *fs_userns = i_user_ns(d_inode(upperdentry));
145 if (attr->ia_valid & ATTR_UID)
146 attr->ia_uid = mapped_kuid_user(upper_mnt_userns,
147 fs_userns, attr->ia_uid);
148 if (attr->ia_valid & ATTR_GID)
149 attr->ia_gid = mapped_kgid_user(upper_mnt_userns,
150 fs_userns, attr->ia_gid);
152 return notify_change(upper_mnt_userns, upperdentry, attr, NULL);
155 static inline int ovl_do_rmdir(struct ovl_fs *ofs,
156 struct inode *dir, struct dentry *dentry)
158 int err = vfs_rmdir(ovl_upper_mnt_userns(ofs), dir, dentry);
160 pr_debug("rmdir(%pd2) = %i\n", dentry, err);
164 static inline int ovl_do_unlink(struct ovl_fs *ofs, struct inode *dir,
165 struct dentry *dentry)
167 int err = vfs_unlink(ovl_upper_mnt_userns(ofs), dir, dentry, NULL);
169 pr_debug("unlink(%pd2) = %i\n", dentry, err);
173 static inline int ovl_do_link(struct ovl_fs *ofs, struct dentry *old_dentry,
174 struct inode *dir, struct dentry *new_dentry)
176 int err = vfs_link(old_dentry, ovl_upper_mnt_userns(ofs), dir, new_dentry, NULL);
178 pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err);
182 static inline int ovl_do_create(struct ovl_fs *ofs,
183 struct inode *dir, struct dentry *dentry,
186 int err = vfs_create(ovl_upper_mnt_userns(ofs), dir, dentry, mode, true);
188 pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
192 static inline int ovl_do_mkdir(struct ovl_fs *ofs,
193 struct inode *dir, struct dentry *dentry,
196 int err = vfs_mkdir(ovl_upper_mnt_userns(ofs), dir, dentry, mode);
197 pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
201 static inline int ovl_do_mknod(struct ovl_fs *ofs,
202 struct inode *dir, struct dentry *dentry,
203 umode_t mode, dev_t dev)
205 int err = vfs_mknod(ovl_upper_mnt_userns(ofs), dir, dentry, mode, dev);
207 pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err);
211 static inline int ovl_do_symlink(struct ovl_fs *ofs,
212 struct inode *dir, struct dentry *dentry,
215 int err = vfs_symlink(ovl_upper_mnt_userns(ofs), dir, dentry, oldname);
217 pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
221 static inline ssize_t ovl_do_getxattr(struct path *path, const char *name,
222 void *value, size_t size)
226 WARN_ON(path->dentry->d_sb != path->mnt->mnt_sb);
228 err = vfs_getxattr(mnt_user_ns(path->mnt), path->dentry,
230 len = (value && err > 0) ? err : 0;
232 pr_debug("getxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n",
233 path->dentry, name, min(len, 48), value, size, err);
237 static inline ssize_t ovl_getxattr_upper(struct ovl_fs *ofs,
238 struct dentry *upperdentry,
239 enum ovl_xattr ox, void *value,
242 struct path upperpath = {
243 .dentry = upperdentry,
244 .mnt = ovl_upper_mnt(ofs),
247 return ovl_do_getxattr(&upperpath, ovl_xattr(ofs, ox), value, size);
250 static inline ssize_t ovl_path_getxattr(struct ovl_fs *ofs,
252 enum ovl_xattr ox, void *value,
255 return ovl_do_getxattr(path, ovl_xattr(ofs, ox), value, size);
258 static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry,
259 const char *name, const void *value,
260 size_t size, int flags)
262 int err = vfs_setxattr(ovl_upper_mnt_userns(ofs), dentry, name, value, size, flags);
264 pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, %d) = %i\n",
265 dentry, name, min((int)size, 48), value, size, flags, err);
269 static inline int ovl_setxattr(struct ovl_fs *ofs, struct dentry *dentry,
270 enum ovl_xattr ox, const void *value,
273 return ovl_do_setxattr(ofs, dentry, ovl_xattr(ofs, ox), value, size, 0);
276 static inline int ovl_do_removexattr(struct ovl_fs *ofs, struct dentry *dentry,
279 int err = vfs_removexattr(ovl_upper_mnt_userns(ofs), dentry, name);
280 pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
284 static inline int ovl_removexattr(struct ovl_fs *ofs, struct dentry *dentry,
287 return ovl_do_removexattr(ofs, dentry, ovl_xattr(ofs, ox));
290 static inline int ovl_do_rename(struct ovl_fs *ofs, struct inode *olddir,
291 struct dentry *olddentry, struct inode *newdir,
292 struct dentry *newdentry, unsigned int flags)
295 struct renamedata rd = {
296 .old_mnt_userns = ovl_upper_mnt_userns(ofs),
298 .old_dentry = olddentry,
299 .new_mnt_userns = ovl_upper_mnt_userns(ofs),
301 .new_dentry = newdentry,
305 pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags);
306 err = vfs_rename(&rd);
308 pr_debug("...rename(%pd2, %pd2, ...) = %i\n",
309 olddentry, newdentry, err);
314 static inline int ovl_do_whiteout(struct ovl_fs *ofs,
315 struct inode *dir, struct dentry *dentry)
317 int err = vfs_whiteout(ovl_upper_mnt_userns(ofs), dir, dentry);
318 pr_debug("whiteout(%pd2) = %i\n", dentry, err);
322 static inline struct dentry *ovl_do_tmpfile(struct ovl_fs *ofs,
323 struct dentry *dentry, umode_t mode)
325 struct dentry *ret = vfs_tmpfile(ovl_upper_mnt_userns(ofs), dentry, mode, 0);
326 int err = PTR_ERR_OR_ZERO(ret);
328 pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err);
332 static inline struct dentry *ovl_lookup_upper(struct ovl_fs *ofs,
334 struct dentry *base, int len)
336 return lookup_one(ovl_upper_mnt_userns(ofs), name, base, len);
339 static inline bool ovl_open_flags_need_copy_up(int flags)
344 return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC));
347 static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs)
350 * To avoid regressions in existing setups with overlay lower offline
351 * changes, we allow lower changes only if none of the new features
354 return (!ofs->config.index && !ofs->config.metacopy &&
355 !ofs->config.redirect_dir && ofs->config.xino != OVL_XINO_ON);
360 int ovl_want_write(struct dentry *dentry);
361 void ovl_drop_write(struct dentry *dentry);
362 struct dentry *ovl_workdir(struct dentry *dentry);
363 const struct cred *ovl_override_creds(struct super_block *sb);
364 int ovl_can_decode_fh(struct super_block *sb);
365 struct dentry *ovl_indexdir(struct super_block *sb);
366 bool ovl_index_all(struct super_block *sb);
367 bool ovl_verify_lower(struct super_block *sb);
368 struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
369 bool ovl_dentry_remote(struct dentry *dentry);
370 void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry,
372 bool ovl_dentry_weird(struct dentry *dentry);
373 enum ovl_path_type ovl_path_type(struct dentry *dentry);
374 void ovl_path_upper(struct dentry *dentry, struct path *path);
375 void ovl_path_lower(struct dentry *dentry, struct path *path);
376 void ovl_path_lowerdata(struct dentry *dentry, struct path *path);
377 void ovl_i_path_real(struct inode *inode, struct path *path);
378 enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
379 enum ovl_path_type ovl_path_realdata(struct dentry *dentry, struct path *path);
380 struct dentry *ovl_dentry_upper(struct dentry *dentry);
381 struct dentry *ovl_dentry_lower(struct dentry *dentry);
382 struct dentry *ovl_dentry_lowerdata(struct dentry *dentry);
383 const struct ovl_layer *ovl_i_layer_lower(struct inode *inode);
384 const struct ovl_layer *ovl_layer_lower(struct dentry *dentry);
385 struct dentry *ovl_dentry_real(struct dentry *dentry);
386 struct dentry *ovl_i_dentry_upper(struct inode *inode);
387 struct inode *ovl_inode_upper(struct inode *inode);
388 struct inode *ovl_inode_lower(struct inode *inode);
389 struct inode *ovl_inode_lowerdata(struct inode *inode);
390 struct inode *ovl_inode_real(struct inode *inode);
391 struct inode *ovl_inode_realdata(struct inode *inode);
392 struct ovl_dir_cache *ovl_dir_cache(struct inode *inode);
393 void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache);
394 void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry);
395 void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry);
396 bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry);
397 bool ovl_dentry_is_opaque(struct dentry *dentry);
398 bool ovl_dentry_is_whiteout(struct dentry *dentry);
399 void ovl_dentry_set_opaque(struct dentry *dentry);
400 bool ovl_dentry_has_upper_alias(struct dentry *dentry);
401 void ovl_dentry_set_upper_alias(struct dentry *dentry);
402 bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags);
403 bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags);
404 bool ovl_has_upperdata(struct inode *inode);
405 void ovl_set_upperdata(struct inode *inode);
406 bool ovl_redirect_dir(struct super_block *sb);
407 const char *ovl_dentry_get_redirect(struct dentry *dentry);
408 void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect);
409 void ovl_inode_update(struct inode *inode, struct dentry *upperdentry);
410 void ovl_dir_modified(struct dentry *dentry, bool impurity);
411 u64 ovl_dentry_version_get(struct dentry *dentry);
412 bool ovl_is_whiteout(struct dentry *dentry);
413 struct file *ovl_path_open(struct path *path, int flags);
414 int ovl_copy_up_start(struct dentry *dentry, int flags);
415 void ovl_copy_up_end(struct dentry *dentry);
416 bool ovl_already_copied_up(struct dentry *dentry, int flags);
417 bool ovl_path_check_dir_xattr(struct ovl_fs *ofs, struct path *path,
419 bool ovl_path_check_origin_xattr(struct ovl_fs *ofs, struct path *path);
421 static inline bool ovl_check_origin_xattr(struct ovl_fs *ofs,
422 struct dentry *upperdentry)
424 struct path upperpath = {
425 .dentry = upperdentry,
426 .mnt = ovl_upper_mnt(ofs),
428 return ovl_path_check_origin_xattr(ofs, &upperpath);
431 int ovl_check_setxattr(struct ovl_fs *ofs, struct dentry *upperdentry,
432 enum ovl_xattr ox, const void *value, size_t size,
434 int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry);
435 bool ovl_inuse_trylock(struct dentry *dentry);
436 void ovl_inuse_unlock(struct dentry *dentry);
437 bool ovl_is_inuse(struct dentry *dentry);
438 bool ovl_need_index(struct dentry *dentry);
439 int ovl_nlink_start(struct dentry *dentry);
440 void ovl_nlink_end(struct dentry *dentry);
441 int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir);
442 int ovl_check_metacopy_xattr(struct ovl_fs *ofs, struct path *path);
443 bool ovl_is_metacopy_dentry(struct dentry *dentry);
444 char *ovl_get_redirect_xattr(struct ovl_fs *ofs, struct path *path, int padding);
445 int ovl_sync_status(struct ovl_fs *ofs);
447 static inline void ovl_set_flag(unsigned long flag, struct inode *inode)
449 set_bit(flag, &OVL_I(inode)->flags);
452 static inline void ovl_clear_flag(unsigned long flag, struct inode *inode)
454 clear_bit(flag, &OVL_I(inode)->flags);
457 static inline bool ovl_test_flag(unsigned long flag, struct inode *inode)
459 return test_bit(flag, &OVL_I(inode)->flags);
462 static inline bool ovl_is_impuredir(struct super_block *sb,
463 struct dentry *upperdentry)
465 struct ovl_fs *ofs = OVL_FS(sb);
466 struct path upperpath = {
467 .dentry = upperdentry,
468 .mnt = ovl_upper_mnt(ofs),
471 return ovl_path_check_dir_xattr(ofs, &upperpath, OVL_XATTR_IMPURE);
475 * With xino=auto, we do best effort to keep all inodes on same st_dev and
476 * d_ino consistent with st_ino.
477 * With xino=on, we do the same effort but we warn if we failed.
479 static inline bool ovl_xino_warn(struct super_block *sb)
481 return OVL_FS(sb)->config.xino == OVL_XINO_ON;
484 /* All layers on same fs? */
485 static inline bool ovl_same_fs(struct super_block *sb)
487 return OVL_FS(sb)->xino_mode == 0;
490 /* All overlay inodes have same st_dev? */
491 static inline bool ovl_same_dev(struct super_block *sb)
493 return OVL_FS(sb)->xino_mode >= 0;
496 static inline unsigned int ovl_xino_bits(struct super_block *sb)
498 return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0;
501 static inline void ovl_inode_lock(struct inode *inode)
503 mutex_lock(&OVL_I(inode)->lock);
506 static inline int ovl_inode_lock_interruptible(struct inode *inode)
508 return mutex_lock_interruptible(&OVL_I(inode)->lock);
511 static inline void ovl_inode_unlock(struct inode *inode)
513 mutex_unlock(&OVL_I(inode)->lock);
518 int ovl_check_fb_len(struct ovl_fb *fb, int fb_len);
520 static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len)
522 if (fh_len < sizeof(struct ovl_fh))
525 return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET);
528 struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh,
529 struct vfsmount *mnt, bool connected);
530 int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected,
531 struct dentry *upperdentry, struct ovl_path **stackp);
532 int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry,
533 enum ovl_xattr ox, struct dentry *real, bool is_upper,
535 struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index);
536 int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index);
537 int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin,
539 struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh);
540 struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
541 struct dentry *origin, bool verify);
542 int ovl_path_next(int idx, struct dentry *dentry, struct path *path);
543 struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
545 bool ovl_lower_positive(struct dentry *dentry);
547 static inline int ovl_verify_origin(struct ovl_fs *ofs, struct dentry *upper,
548 struct dentry *origin, bool set)
550 return ovl_verify_set_fh(ofs, upper, OVL_XATTR_ORIGIN, origin,
554 static inline int ovl_verify_upper(struct ovl_fs *ofs, struct dentry *index,
555 struct dentry *upper, bool set)
557 return ovl_verify_set_fh(ofs, index, OVL_XATTR_UPPER, upper, true, set);
561 extern const struct file_operations ovl_dir_operations;
562 struct file *ovl_dir_real_file(const struct file *file, bool want_upper);
563 int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
564 void ovl_cleanup_whiteouts(struct ovl_fs *ofs, struct dentry *upper,
565 struct list_head *list);
566 void ovl_cache_free(struct list_head *list);
567 void ovl_dir_cache_free(struct inode *inode);
568 int ovl_check_d_type_supported(struct path *realpath);
569 int ovl_workdir_cleanup(struct ovl_fs *ofs, struct inode *dir,
570 struct vfsmount *mnt, struct dentry *dentry, int level);
571 int ovl_indexdir_cleanup(struct ovl_fs *ofs);
574 * Can we iterate real dir directly?
576 * Non-merge dir may contain whiteouts from a time it was a merge upper, before
577 * lower dir was removed under it and possibly before it was rotated from upper
580 static inline bool ovl_dir_is_real(struct dentry *dir)
582 return !ovl_test_flag(OVL_WHITEOUTS, d_inode(dir));
586 int ovl_set_nlink_upper(struct dentry *dentry);
587 int ovl_set_nlink_lower(struct dentry *dentry);
588 unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry,
589 struct dentry *upperdentry,
590 unsigned int fallback);
591 int ovl_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
593 int ovl_getattr(struct user_namespace *mnt_userns, const struct path *path,
594 struct kstat *stat, u32 request_mask, unsigned int flags);
595 int ovl_permission(struct user_namespace *mnt_userns, struct inode *inode,
597 int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
598 const void *value, size_t size, int flags);
599 int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name,
600 void *value, size_t size);
601 ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
602 struct posix_acl *ovl_get_acl(struct inode *inode, int type, bool rcu);
603 int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags);
604 bool ovl_is_private_xattr(struct super_block *sb, const char *name);
606 struct ovl_inode_params {
607 struct inode *newinode;
608 struct dentry *upperdentry;
609 struct ovl_path *lowerpath;
611 unsigned int numlower;
613 struct dentry *lowerdata;
615 void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip,
616 unsigned long ino, int fsid);
617 struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev);
618 struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real,
620 bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir);
621 struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir);
622 struct inode *ovl_get_inode(struct super_block *sb,
623 struct ovl_inode_params *oip);
624 void ovl_copyattr(struct inode *to);
626 /* vfs inode flags copied from real to ovl inode */
627 #define OVL_COPY_I_FLAGS_MASK (S_SYNC | S_NOATIME | S_APPEND | S_IMMUTABLE)
628 /* vfs inode flags read from overlay.protattr xattr to ovl inode */
629 #define OVL_PROT_I_FLAGS_MASK (S_APPEND | S_IMMUTABLE)
632 * fileattr flags copied from lower to upper inode on copy up.
633 * We cannot copy up immutable/append-only flags, because that would prevent
634 * linking temp inode to upper dir, so we store them in xattr instead.
636 #define OVL_COPY_FS_FLAGS_MASK (FS_SYNC_FL | FS_NOATIME_FL)
637 #define OVL_COPY_FSX_FLAGS_MASK (FS_XFLAG_SYNC | FS_XFLAG_NOATIME)
638 #define OVL_PROT_FS_FLAGS_MASK (FS_APPEND_FL | FS_IMMUTABLE_FL)
639 #define OVL_PROT_FSX_FLAGS_MASK (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE)
641 void ovl_check_protattr(struct inode *inode, struct dentry *upper);
642 int ovl_set_protattr(struct inode *inode, struct dentry *upper,
643 struct fileattr *fa);
645 static inline void ovl_copyflags(struct inode *from, struct inode *to)
647 unsigned int mask = OVL_COPY_I_FLAGS_MASK;
649 inode_set_flags(to, from->i_flags & mask, mask);
653 extern const struct inode_operations ovl_dir_inode_operations;
654 int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir,
655 struct dentry *dentry);
660 struct dentry *hardlink;
663 #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) })
665 int ovl_mkdir_real(struct ovl_fs *ofs, struct inode *dir,
666 struct dentry **newdentry, umode_t mode);
667 struct dentry *ovl_create_real(struct ovl_fs *ofs,
668 struct inode *dir, struct dentry *newdentry,
669 struct ovl_cattr *attr);
670 int ovl_cleanup(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry);
671 struct dentry *ovl_lookup_temp(struct ovl_fs *ofs, struct dentry *workdir);
672 struct dentry *ovl_create_temp(struct ovl_fs *ofs, struct dentry *workdir,
673 struct ovl_cattr *attr);
676 extern const struct file_operations ovl_file_operations;
677 int __init ovl_aio_request_cache_init(void);
678 void ovl_aio_request_cache_destroy(void);
679 int ovl_real_fileattr_get(struct path *realpath, struct fileattr *fa);
680 int ovl_real_fileattr_set(struct path *realpath, struct fileattr *fa);
681 int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa);
682 int ovl_fileattr_set(struct user_namespace *mnt_userns,
683 struct dentry *dentry, struct fileattr *fa);
686 int ovl_copy_up(struct dentry *dentry);
687 int ovl_copy_up_with_data(struct dentry *dentry);
688 int ovl_maybe_copy_up(struct dentry *dentry, int flags);
689 int ovl_copy_xattr(struct super_block *sb, struct path *path, struct dentry *new);
690 int ovl_set_attr(struct ovl_fs *ofs, struct dentry *upper, struct kstat *stat);
691 struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real,
693 int ovl_set_origin(struct ovl_fs *ofs, struct dentry *lower,
694 struct dentry *upper);
697 extern const struct export_operations ovl_export_operations;