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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- *
- * Copyright (C) 2011 Novell Inc.
- */
- #include <linux/kernel.h>
- #include <linux/uuid.h>
- #include <linux/fs.h>
- #include <linux/namei.h>
- #include "ovl_entry.h"
- #undef pr_fmt
- #define pr_fmt(fmt) "overlayfs: " fmt
- enum ovl_path_type {
- __OVL_PATH_UPPER = (1 << 0),
- __OVL_PATH_MERGE = (1 << 1),
- __OVL_PATH_ORIGIN = (1 << 2),
- };
- #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER)
- #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE)
- #define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN)
- #define OVL_XATTR_NAMESPACE "overlay."
- #define OVL_XATTR_TRUSTED_PREFIX XATTR_TRUSTED_PREFIX OVL_XATTR_NAMESPACE
- #define OVL_XATTR_USER_PREFIX XATTR_USER_PREFIX OVL_XATTR_NAMESPACE
- enum ovl_xattr {
- OVL_XATTR_OPAQUE,
- OVL_XATTR_REDIRECT,
- OVL_XATTR_ORIGIN,
- OVL_XATTR_IMPURE,
- OVL_XATTR_NLINK,
- OVL_XATTR_UPPER,
- OVL_XATTR_METACOPY,
- OVL_XATTR_PROTATTR,
- };
- enum ovl_inode_flag {
- /* Pure upper dir that may contain non pure upper entries */
- OVL_IMPURE,
- /* Non-merge dir that may contain whiteout entries */
- OVL_WHITEOUTS,
- OVL_INDEX,
- OVL_UPPERDATA,
- /* Inode number will remain constant over copy up. */
- OVL_CONST_INO,
- };
- enum ovl_entry_flag {
- OVL_E_UPPER_ALIAS,
- OVL_E_OPAQUE,
- OVL_E_CONNECTED,
- };
- enum {
- OVL_XINO_OFF,
- OVL_XINO_AUTO,
- OVL_XINO_ON,
- };
- /*
- * The tuple (fh,uuid) is a universal unique identifier for a copy up origin,
- * where:
- * origin.fh - exported file handle of the lower file
- * origin.uuid - uuid of the lower filesystem
- */
- #define OVL_FH_VERSION 0
- #define OVL_FH_MAGIC 0xfb
- /* CPU byte order required for fid decoding: */
- #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0)
- #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1)
- /* Is the real inode encoded in fid an upper inode? */
- #define OVL_FH_FLAG_PATH_UPPER (1 << 2)
- #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \
- OVL_FH_FLAG_PATH_UPPER)
- #if defined(__LITTLE_ENDIAN)
- #define OVL_FH_FLAG_CPU_ENDIAN 0
- #elif defined(__BIG_ENDIAN)
- #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN
- #else
- #error Endianness not defined
- #endif
- /* The type used to be returned by overlay exportfs for misaligned fid */
- #define OVL_FILEID_V0 0xfb
- /* The type returned by overlay exportfs for 32bit aligned fid */
- #define OVL_FILEID_V1 0xf8
- /* On-disk format for "origin" file handle */
- struct ovl_fb {
- u8 version; /* 0 */
- u8 magic; /* 0xfb */
- u8 len; /* size of this header + size of fid */
- u8 flags; /* OVL_FH_FLAG_* */
- u8 type; /* fid_type of fid */
- uuid_t uuid; /* uuid of filesystem */
- u32 fid[]; /* file identifier should be 32bit aligned in-memory */
- } __packed;
- /* In-memory and on-wire format for overlay file handle */
- struct ovl_fh {
- u8 padding[3]; /* make sure fb.fid is 32bit aligned */
- union {
- struct ovl_fb fb;
- DECLARE_FLEX_ARRAY(u8, buf);
- };
- } __packed;
- #define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb)
- #define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len)
- #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \
- offsetof(struct ovl_fb, fid))
- extern const char *const ovl_xattr_table[][2];
- static inline const char *ovl_xattr(struct ovl_fs *ofs, enum ovl_xattr ox)
- {
- return ovl_xattr_table[ox][ofs->config.userxattr];
- }
- /*
- * When changing ownership of an upper object map the intended ownership
- * according to the upper layer's idmapping. When an upper mount idmaps files
- * that are stored on-disk as owned by id 1001 to id 1000 this means stat on
- * this object will report it as being owned by id 1000 when calling stat via
- * the upper mount.
- * In order to change ownership of an object so stat reports id 1000 when
- * called on an idmapped upper mount the value written to disk - i.e., the
- * value stored in ia_*id - must 1001. The mount mapping helper will thus take
- * care to map 1000 to 1001.
- * The mnt idmapping helpers are nops if the upper layer isn't idmapped.
- */
- static inline int ovl_do_notify_change(struct ovl_fs *ofs,
- struct dentry *upperdentry,
- struct iattr *attr)
- {
- return notify_change(ovl_upper_mnt_userns(ofs), upperdentry, attr, NULL);
- }
- static inline int ovl_do_rmdir(struct ovl_fs *ofs,
- struct inode *dir, struct dentry *dentry)
- {
- int err = vfs_rmdir(ovl_upper_mnt_userns(ofs), dir, dentry);
- pr_debug("rmdir(%pd2) = %i\n", dentry, err);
- return err;
- }
- static inline int ovl_do_unlink(struct ovl_fs *ofs, struct inode *dir,
- struct dentry *dentry)
- {
- int err = vfs_unlink(ovl_upper_mnt_userns(ofs), dir, dentry, NULL);
- pr_debug("unlink(%pd2) = %i\n", dentry, err);
- return err;
- }
- static inline int ovl_do_link(struct ovl_fs *ofs, struct dentry *old_dentry,
- struct inode *dir, struct dentry *new_dentry)
- {
- int err = vfs_link(old_dentry, ovl_upper_mnt_userns(ofs), dir, new_dentry, NULL);
- pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err);
- return err;
- }
- static inline int ovl_do_create(struct ovl_fs *ofs,
- struct inode *dir, struct dentry *dentry,
- umode_t mode)
- {
- int err = vfs_create(ovl_upper_mnt_userns(ofs), dir, dentry, mode, true);
- pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
- return err;
- }
- static inline int ovl_do_mkdir(struct ovl_fs *ofs,
- struct inode *dir, struct dentry *dentry,
- umode_t mode)
- {
- int err = vfs_mkdir(ovl_upper_mnt_userns(ofs), dir, dentry, mode);
- pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
- return err;
- }
- static inline int ovl_do_mknod(struct ovl_fs *ofs,
- struct inode *dir, struct dentry *dentry,
- umode_t mode, dev_t dev)
- {
- int err = vfs_mknod(ovl_upper_mnt_userns(ofs), dir, dentry, mode, dev);
- pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err);
- return err;
- }
- static inline int ovl_do_symlink(struct ovl_fs *ofs,
- struct inode *dir, struct dentry *dentry,
- const char *oldname)
- {
- int err = vfs_symlink(ovl_upper_mnt_userns(ofs), dir, dentry, oldname);
- pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
- return err;
- }
- static inline ssize_t ovl_do_getxattr(const struct path *path, const char *name,
- void *value, size_t size)
- {
- int err, len;
- WARN_ON(path->dentry->d_sb != path->mnt->mnt_sb);
- err = vfs_getxattr(mnt_user_ns(path->mnt), path->dentry,
- name, value, size);
- len = (value && err > 0) ? err : 0;
- pr_debug("getxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n",
- path->dentry, name, min(len, 48), value, size, err);
- return err;
- }
- static inline ssize_t ovl_getxattr_upper(struct ovl_fs *ofs,
- struct dentry *upperdentry,
- enum ovl_xattr ox, void *value,
- size_t size)
- {
- struct path upperpath = {
- .dentry = upperdentry,
- .mnt = ovl_upper_mnt(ofs),
- };
- return ovl_do_getxattr(&upperpath, ovl_xattr(ofs, ox), value, size);
- }
- static inline ssize_t ovl_path_getxattr(struct ovl_fs *ofs,
- const struct path *path,
- enum ovl_xattr ox, void *value,
- size_t size)
- {
- return ovl_do_getxattr(path, ovl_xattr(ofs, ox), value, size);
- }
- static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry,
- const char *name, const void *value,
- size_t size, int flags)
- {
- int err = vfs_setxattr(ovl_upper_mnt_userns(ofs), dentry, name,
- value, size, flags);
- pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, %d) = %i\n",
- dentry, name, min((int)size, 48), value, size, flags, err);
- return err;
- }
- static inline int ovl_setxattr(struct ovl_fs *ofs, struct dentry *dentry,
- enum ovl_xattr ox, const void *value,
- size_t size)
- {
- return ovl_do_setxattr(ofs, dentry, ovl_xattr(ofs, ox), value, size, 0);
- }
- static inline int ovl_do_removexattr(struct ovl_fs *ofs, struct dentry *dentry,
- const char *name)
- {
- int err = vfs_removexattr(ovl_upper_mnt_userns(ofs), dentry, name);
- pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
- return err;
- }
- static inline int ovl_removexattr(struct ovl_fs *ofs, struct dentry *dentry,
- enum ovl_xattr ox)
- {
- return ovl_do_removexattr(ofs, dentry, ovl_xattr(ofs, ox));
- }
- static inline int ovl_do_rename(struct ovl_fs *ofs, struct inode *olddir,
- struct dentry *olddentry, struct inode *newdir,
- struct dentry *newdentry, unsigned int flags)
- {
- int err;
- struct renamedata rd = {
- .old_mnt_userns = ovl_upper_mnt_userns(ofs),
- .old_dir = olddir,
- .old_dentry = olddentry,
- .new_mnt_userns = ovl_upper_mnt_userns(ofs),
- .new_dir = newdir,
- .new_dentry = newdentry,
- .flags = flags,
- };
- pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags);
- err = vfs_rename(&rd);
- if (err) {
- pr_debug("...rename(%pd2, %pd2, ...) = %i\n",
- olddentry, newdentry, err);
- }
- return err;
- }
- static inline int ovl_do_whiteout(struct ovl_fs *ofs,
- struct inode *dir, struct dentry *dentry)
- {
- int err = vfs_whiteout(ovl_upper_mnt_userns(ofs), dir, dentry);
- pr_debug("whiteout(%pd2) = %i\n", dentry, err);
- return err;
- }
- static inline struct file *ovl_do_tmpfile(struct ovl_fs *ofs,
- struct dentry *dentry, umode_t mode)
- {
- struct path path = { .mnt = ovl_upper_mnt(ofs), .dentry = dentry };
- struct file *file = vfs_tmpfile_open(ovl_upper_mnt_userns(ofs), &path, mode,
- O_LARGEFILE | O_WRONLY, current_cred());
- int err = PTR_ERR_OR_ZERO(file);
- pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err);
- return file;
- }
- static inline struct dentry *ovl_lookup_upper(struct ovl_fs *ofs,
- const char *name,
- struct dentry *base, int len)
- {
- return lookup_one(ovl_upper_mnt_userns(ofs), name, base, len);
- }
- static inline bool ovl_open_flags_need_copy_up(int flags)
- {
- if (!flags)
- return false;
- return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC));
- }
- static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs)
- {
- /*
- * To avoid regressions in existing setups with overlay lower offline
- * changes, we allow lower changes only if none of the new features
- * are used.
- */
- return (!ofs->config.index && !ofs->config.metacopy &&
- !ofs->config.redirect_dir && ofs->config.xino != OVL_XINO_ON);
- }
- /* util.c */
- int ovl_want_write(struct dentry *dentry);
- void ovl_drop_write(struct dentry *dentry);
- struct dentry *ovl_workdir(struct dentry *dentry);
- const struct cred *ovl_override_creds(struct super_block *sb);
- void ovl_revert_creds(struct super_block *sb, const struct cred *oldcred);
- int ovl_can_decode_fh(struct super_block *sb);
- struct dentry *ovl_indexdir(struct super_block *sb);
- bool ovl_index_all(struct super_block *sb);
- bool ovl_verify_lower(struct super_block *sb);
- struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
- bool ovl_dentry_remote(struct dentry *dentry);
- void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *realdentry);
- void ovl_dentry_init_reval(struct dentry *dentry, struct dentry *upperdentry);
- void ovl_dentry_init_flags(struct dentry *dentry, struct dentry *upperdentry,
- unsigned int mask);
- bool ovl_dentry_weird(struct dentry *dentry);
- enum ovl_path_type ovl_path_type(struct dentry *dentry);
- void ovl_path_upper(struct dentry *dentry, struct path *path);
- void ovl_path_lower(struct dentry *dentry, struct path *path);
- void ovl_path_lowerdata(struct dentry *dentry, struct path *path);
- struct inode *ovl_i_path_real(struct inode *inode, struct path *path);
- enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
- enum ovl_path_type ovl_path_realdata(struct dentry *dentry, struct path *path);
- struct dentry *ovl_dentry_upper(struct dentry *dentry);
- struct dentry *ovl_dentry_lower(struct dentry *dentry);
- struct dentry *ovl_dentry_lowerdata(struct dentry *dentry);
- const struct ovl_layer *ovl_i_layer_lower(struct inode *inode);
- const struct ovl_layer *ovl_layer_lower(struct dentry *dentry);
- struct dentry *ovl_dentry_real(struct dentry *dentry);
- struct dentry *ovl_i_dentry_upper(struct inode *inode);
- struct inode *ovl_inode_upper(struct inode *inode);
- struct inode *ovl_inode_lower(struct inode *inode);
- struct inode *ovl_inode_lowerdata(struct inode *inode);
- struct inode *ovl_inode_real(struct inode *inode);
- struct inode *ovl_inode_realdata(struct inode *inode);
- struct ovl_dir_cache *ovl_dir_cache(struct inode *inode);
- void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache);
- void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry);
- void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry);
- bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry);
- bool ovl_dentry_is_opaque(struct dentry *dentry);
- bool ovl_dentry_is_whiteout(struct dentry *dentry);
- void ovl_dentry_set_opaque(struct dentry *dentry);
- bool ovl_dentry_has_upper_alias(struct dentry *dentry);
- void ovl_dentry_set_upper_alias(struct dentry *dentry);
- bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags);
- bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags);
- bool ovl_has_upperdata(struct inode *inode);
- void ovl_set_upperdata(struct inode *inode);
- bool ovl_redirect_dir(struct super_block *sb);
- const char *ovl_dentry_get_redirect(struct dentry *dentry);
- void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect);
- void ovl_inode_update(struct inode *inode, struct dentry *upperdentry);
- void ovl_dir_modified(struct dentry *dentry, bool impurity);
- u64 ovl_dentry_version_get(struct dentry *dentry);
- bool ovl_is_whiteout(struct dentry *dentry);
- struct file *ovl_path_open(const struct path *path, int flags);
- int ovl_copy_up_start(struct dentry *dentry, int flags);
- void ovl_copy_up_end(struct dentry *dentry);
- bool ovl_already_copied_up(struct dentry *dentry, int flags);
- bool ovl_path_check_dir_xattr(struct ovl_fs *ofs, const struct path *path,
- enum ovl_xattr ox);
- bool ovl_path_check_origin_xattr(struct ovl_fs *ofs, const struct path *path);
- static inline bool ovl_check_origin_xattr(struct ovl_fs *ofs,
- struct dentry *upperdentry)
- {
- struct path upperpath = {
- .dentry = upperdentry,
- .mnt = ovl_upper_mnt(ofs),
- };
- return ovl_path_check_origin_xattr(ofs, &upperpath);
- }
- int ovl_check_setxattr(struct ovl_fs *ofs, struct dentry *upperdentry,
- enum ovl_xattr ox, const void *value, size_t size,
- int xerr);
- int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry);
- bool ovl_inuse_trylock(struct dentry *dentry);
- void ovl_inuse_unlock(struct dentry *dentry);
- bool ovl_is_inuse(struct dentry *dentry);
- bool ovl_need_index(struct dentry *dentry);
- int ovl_nlink_start(struct dentry *dentry);
- void ovl_nlink_end(struct dentry *dentry);
- int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir);
- int ovl_check_metacopy_xattr(struct ovl_fs *ofs, const struct path *path);
- bool ovl_is_metacopy_dentry(struct dentry *dentry);
- char *ovl_get_redirect_xattr(struct ovl_fs *ofs, const struct path *path, int padding);
- int ovl_sync_status(struct ovl_fs *ofs);
- static inline void ovl_set_flag(unsigned long flag, struct inode *inode)
- {
- set_bit(flag, &OVL_I(inode)->flags);
- }
- static inline void ovl_clear_flag(unsigned long flag, struct inode *inode)
- {
- clear_bit(flag, &OVL_I(inode)->flags);
- }
- static inline bool ovl_test_flag(unsigned long flag, struct inode *inode)
- {
- return test_bit(flag, &OVL_I(inode)->flags);
- }
- static inline bool ovl_is_impuredir(struct super_block *sb,
- struct dentry *upperdentry)
- {
- struct ovl_fs *ofs = OVL_FS(sb);
- struct path upperpath = {
- .dentry = upperdentry,
- .mnt = ovl_upper_mnt(ofs),
- };
- return ovl_path_check_dir_xattr(ofs, &upperpath, OVL_XATTR_IMPURE);
- }
- /*
- * With xino=auto, we do best effort to keep all inodes on same st_dev and
- * d_ino consistent with st_ino.
- * With xino=on, we do the same effort but we warn if we failed.
- */
- static inline bool ovl_xino_warn(struct super_block *sb)
- {
- return OVL_FS(sb)->config.xino == OVL_XINO_ON;
- }
- /* All layers on same fs? */
- static inline bool ovl_same_fs(struct super_block *sb)
- {
- return OVL_FS(sb)->xino_mode == 0;
- }
- /* All overlay inodes have same st_dev? */
- static inline bool ovl_same_dev(struct super_block *sb)
- {
- return OVL_FS(sb)->xino_mode >= 0;
- }
- static inline unsigned int ovl_xino_bits(struct super_block *sb)
- {
- return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0;
- }
- static inline void ovl_inode_lock(struct inode *inode)
- {
- mutex_lock(&OVL_I(inode)->lock);
- }
- static inline int ovl_inode_lock_interruptible(struct inode *inode)
- {
- return mutex_lock_interruptible(&OVL_I(inode)->lock);
- }
- static inline void ovl_inode_unlock(struct inode *inode)
- {
- mutex_unlock(&OVL_I(inode)->lock);
- }
- /* namei.c */
- int ovl_check_fb_len(struct ovl_fb *fb, int fb_len);
- static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len)
- {
- if (fh_len < sizeof(struct ovl_fh))
- return -EINVAL;
- return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET);
- }
- struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh,
- struct vfsmount *mnt, bool connected);
- int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected,
- struct dentry *upperdentry, struct ovl_path **stackp);
- int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry,
- enum ovl_xattr ox, struct dentry *real, bool is_upper,
- bool set);
- struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index);
- int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index);
- int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin,
- struct qstr *name);
- struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh);
- struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
- struct dentry *origin, bool verify);
- int ovl_path_next(int idx, struct dentry *dentry, struct path *path);
- struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
- unsigned int flags);
- bool ovl_lower_positive(struct dentry *dentry);
- static inline int ovl_verify_origin(struct ovl_fs *ofs, struct dentry *upper,
- struct dentry *origin, bool set)
- {
- return ovl_verify_set_fh(ofs, upper, OVL_XATTR_ORIGIN, origin,
- false, set);
- }
- static inline int ovl_verify_upper(struct ovl_fs *ofs, struct dentry *index,
- struct dentry *upper, bool set)
- {
- return ovl_verify_set_fh(ofs, index, OVL_XATTR_UPPER, upper, true, set);
- }
- /* readdir.c */
- extern const struct file_operations ovl_dir_operations;
- struct file *ovl_dir_real_file(const struct file *file, bool want_upper);
- int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
- void ovl_cleanup_whiteouts(struct ovl_fs *ofs, struct dentry *upper,
- struct list_head *list);
- void ovl_cache_free(struct list_head *list);
- void ovl_dir_cache_free(struct inode *inode);
- int ovl_check_d_type_supported(const struct path *realpath);
- int ovl_workdir_cleanup(struct ovl_fs *ofs, struct inode *dir,
- struct vfsmount *mnt, struct dentry *dentry, int level);
- int ovl_indexdir_cleanup(struct ovl_fs *ofs);
- /*
- * Can we iterate real dir directly?
- *
- * Non-merge dir may contain whiteouts from a time it was a merge upper, before
- * lower dir was removed under it and possibly before it was rotated from upper
- * to lower layer.
- */
- static inline bool ovl_dir_is_real(struct dentry *dir)
- {
- return !ovl_test_flag(OVL_WHITEOUTS, d_inode(dir));
- }
- /* inode.c */
- int ovl_set_nlink_upper(struct dentry *dentry);
- int ovl_set_nlink_lower(struct dentry *dentry);
- unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry,
- struct dentry *upperdentry,
- unsigned int fallback);
- int ovl_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
- struct iattr *attr);
- int ovl_getattr(struct user_namespace *mnt_userns, const struct path *path,
- struct kstat *stat, u32 request_mask, unsigned int flags);
- int ovl_permission(struct user_namespace *mnt_userns, struct inode *inode,
- int mask);
- int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
- const void *value, size_t size, int flags);
- int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name,
- void *value, size_t size);
- ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
- #ifdef CONFIG_FS_POSIX_ACL
- struct posix_acl *ovl_get_acl(struct inode *inode, int type, bool rcu);
- #else
- #define ovl_get_acl NULL
- #endif
- int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags);
- bool ovl_is_private_xattr(struct super_block *sb, const char *name);
- struct ovl_inode_params {
- struct inode *newinode;
- struct dentry *upperdentry;
- struct ovl_path *lowerpath;
- bool index;
- unsigned int numlower;
- char *redirect;
- struct dentry *lowerdata;
- };
- void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip,
- unsigned long ino, int fsid);
- struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev);
- struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real,
- bool is_upper);
- bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir);
- struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir);
- struct inode *ovl_get_inode(struct super_block *sb,
- struct ovl_inode_params *oip);
- void ovl_copyattr(struct inode *to);
- /* vfs inode flags copied from real to ovl inode */
- #define OVL_COPY_I_FLAGS_MASK (S_SYNC | S_NOATIME | S_APPEND | S_IMMUTABLE)
- /* vfs inode flags read from overlay.protattr xattr to ovl inode */
- #define OVL_PROT_I_FLAGS_MASK (S_APPEND | S_IMMUTABLE)
- /*
- * fileattr flags copied from lower to upper inode on copy up.
- * We cannot copy up immutable/append-only flags, because that would prevent
- * linking temp inode to upper dir, so we store them in xattr instead.
- */
- #define OVL_COPY_FS_FLAGS_MASK (FS_SYNC_FL | FS_NOATIME_FL)
- #define OVL_COPY_FSX_FLAGS_MASK (FS_XFLAG_SYNC | FS_XFLAG_NOATIME)
- #define OVL_PROT_FS_FLAGS_MASK (FS_APPEND_FL | FS_IMMUTABLE_FL)
- #define OVL_PROT_FSX_FLAGS_MASK (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE)
- void ovl_check_protattr(struct inode *inode, struct dentry *upper);
- int ovl_set_protattr(struct inode *inode, struct dentry *upper,
- struct fileattr *fa);
- static inline void ovl_copyflags(struct inode *from, struct inode *to)
- {
- unsigned int mask = OVL_COPY_I_FLAGS_MASK;
- inode_set_flags(to, from->i_flags & mask, mask);
- }
- /* dir.c */
- extern const struct inode_operations ovl_dir_inode_operations;
- int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir,
- struct dentry *dentry);
- struct ovl_cattr {
- dev_t rdev;
- umode_t mode;
- const char *link;
- struct dentry *hardlink;
- };
- #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) })
- int ovl_mkdir_real(struct ovl_fs *ofs, struct inode *dir,
- struct dentry **newdentry, umode_t mode);
- struct dentry *ovl_create_real(struct ovl_fs *ofs,
- struct inode *dir, struct dentry *newdentry,
- struct ovl_cattr *attr);
- int ovl_cleanup(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry);
- struct dentry *ovl_lookup_temp(struct ovl_fs *ofs, struct dentry *workdir);
- struct dentry *ovl_create_temp(struct ovl_fs *ofs, struct dentry *workdir,
- struct ovl_cattr *attr);
- /* file.c */
- extern const struct file_operations ovl_file_operations;
- int __init ovl_aio_request_cache_init(void);
- void ovl_aio_request_cache_destroy(void);
- int ovl_real_fileattr_get(const struct path *realpath, struct fileattr *fa);
- int ovl_real_fileattr_set(const struct path *realpath, struct fileattr *fa);
- int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa);
- int ovl_fileattr_set(struct user_namespace *mnt_userns,
- struct dentry *dentry, struct fileattr *fa);
- /* copy_up.c */
- int ovl_copy_up(struct dentry *dentry);
- int ovl_copy_up_with_data(struct dentry *dentry);
- int ovl_maybe_copy_up(struct dentry *dentry, int flags);
- int ovl_copy_xattr(struct super_block *sb, const struct path *path, struct dentry *new);
- int ovl_set_attr(struct ovl_fs *ofs, struct dentry *upper, struct kstat *stat);
- struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real,
- bool is_upper);
- int ovl_set_origin(struct ovl_fs *ofs, struct dentry *lower,
- struct dentry *upper);
- /* export.c */
- extern const struct export_operations ovl_export_operations;
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