/* * * Copyright (C) 2011 Novell Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. */ #include <linux/kernel.h> enum ovl_path_type { __OVL_PATH_UPPER = (1 << 0), __OVL_PATH_MERGE = (1 << 1), }; #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) #define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay." #define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque" #define OVL_XATTR_REDIRECT OVL_XATTR_PREFIX "redirect" #define OVL_ISUPPER_MASK 1UL static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry) { int err = vfs_rmdir(dir, dentry); pr_debug("rmdir(%pd2) = %i\n", dentry, err); return err; } static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry) { int err = vfs_unlink(dir, dentry, NULL); pr_debug("unlink(%pd2) = %i\n", dentry, err); return err; } static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry, bool debug) { int err = vfs_link(old_dentry, dir, new_dentry, NULL); if (debug) { pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err); } return err; } static inline int ovl_do_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool debug) { int err = vfs_create(dir, dentry, mode, true); if (debug) pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); return err; } static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, bool debug) { int err = vfs_mkdir(dir, dentry, mode); if (debug) pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); return err; } static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev, bool debug) { int err = vfs_mknod(dir, dentry, mode, dev); if (debug) { pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err); } return err; } static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry, const char *oldname, bool debug) { int err = vfs_symlink(dir, dentry, oldname); if (debug) pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); return err; } static inline int ovl_do_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { int err = vfs_setxattr(dentry, name, value, size, flags); pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n", dentry, name, (int) size, (char *) value, flags, err); return err; } static inline int ovl_do_removexattr(struct dentry *dentry, const char *name) { int err = vfs_removexattr(dentry, name); pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); return err; } static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry, struct inode *newdir, struct dentry *newdentry, unsigned int flags) { int err; pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags); err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags); if (err) { pr_debug("...rename(%pd2, %pd2, ...) = %i\n", olddentry, newdentry, err); } return err; } static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry) { int err = vfs_whiteout(dir, dentry); pr_debug("whiteout(%pd2) = %i\n", dentry, err); return err; } static inline struct inode *ovl_inode_real(struct inode *inode, bool *is_upper) { unsigned long x = (unsigned long) READ_ONCE(inode->i_private); if (is_upper) *is_upper = x & OVL_ISUPPER_MASK; return (struct inode *) (x & ~OVL_ISUPPER_MASK); } /* 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); struct ovl_entry *ovl_alloc_entry(unsigned int numlower); bool ovl_dentry_remote(struct dentry *dentry); 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); enum ovl_path_type ovl_path_real(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_real(struct dentry *dentry); struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry); void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache); 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_redirect_dir(struct super_block *sb); void ovl_clear_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_dentry_update(struct dentry *dentry, struct dentry *upperdentry); void ovl_inode_init(struct inode *inode, struct inode *realinode, bool is_upper); void ovl_inode_update(struct inode *inode, struct inode *upperinode); void ovl_dentry_version_inc(struct dentry *dentry); u64 ovl_dentry_version_get(struct dentry *dentry); bool ovl_is_whiteout(struct dentry *dentry); struct file *ovl_path_open(struct path *path, int flags); /* namei.c */ 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); /* readdir.c */ extern const struct file_operations ovl_dir_operations; int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); void ovl_cache_free(struct list_head *list); int ovl_check_d_type_supported(struct path *realpath); void ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt, struct dentry *dentry, int level); /* inode.c */ int ovl_setattr(struct dentry *dentry, struct iattr *attr); int ovl_permission(struct inode *inode, int mask); int ovl_xattr_set(struct dentry *dentry, const char *name, const void *value, size_t size, int flags); int ovl_xattr_get(struct dentry *dentry, const char *name, void *value, size_t size); ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); struct posix_acl *ovl_get_acl(struct inode *inode, int type); int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags); int ovl_update_time(struct inode *inode, struct timespec *ts, int flags); bool ovl_is_private_xattr(const char *name); struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); struct inode *ovl_get_inode(struct super_block *sb, struct inode *realinode); static inline void ovl_copyattr(struct inode *from, struct inode *to) { to->i_uid = from->i_uid; to->i_gid = from->i_gid; to->i_mode = from->i_mode; to->i_atime = from->i_atime; to->i_mtime = from->i_mtime; to->i_ctime = from->i_ctime; } /* dir.c */ extern const struct inode_operations ovl_dir_inode_operations; struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry); struct cattr { dev_t rdev; umode_t mode; const char *link; }; int ovl_create_real(struct inode *dir, struct dentry *newdentry, struct cattr *attr, struct dentry *hardlink, bool debug); void ovl_cleanup(struct inode *dir, struct dentry *dentry); /* copy_up.c */ int ovl_copy_up(struct dentry *dentry); int ovl_copy_up_flags(struct dentry *dentry, int flags); int ovl_copy_xattr(struct dentry *old, struct dentry *new); int ovl_set_attr(struct dentry *upper, struct kstat *stat);