| /* |
| * |
| * 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> |
| |
| struct ovl_entry; |
| |
| enum ovl_path_type { |
| __OVL_PATH_PURE = (1 << 0), |
| __OVL_PATH_UPPER = (1 << 1), |
| __OVL_PATH_MERGE = (1 << 2), |
| }; |
| |
| #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) |
| #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) |
| #define OVL_TYPE_PURE_UPPER(type) ((type) & __OVL_PATH_PURE) |
| #define OVL_TYPE_MERGE_OR_LOWER(type) \ |
| (OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type)) |
| |
| #define OVL_XATTR_PRE_NAME "trusted.overlay." |
| #define OVL_XATTR_PRE_LEN 16 |
| #define OVL_XATTR_OPAQUE OVL_XATTR_PRE_NAME"opaque" |
| |
| 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("rename2(%pd2, %pd2, 0x%x)\n", |
| olddentry, newdentry, flags); |
| |
| err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags); |
| |
| if (err) { |
| pr_debug("...rename2(%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; |
| } |
| |
| enum ovl_path_type ovl_path_type(struct dentry *dentry); |
| u64 ovl_dentry_version_get(struct dentry *dentry); |
| void ovl_dentry_version_inc(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); |
| int ovl_path_next(int idx, 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 dentry *ovl_entry_real(struct ovl_entry *oe, bool *is_upper); |
| struct vfsmount *ovl_entry_mnt_real(struct ovl_entry *oe, struct inode *inode, |
| bool is_upper); |
| struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry); |
| bool ovl_is_default_permissions(struct inode *inode); |
| void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache); |
| struct dentry *ovl_workdir(struct dentry *dentry); |
| int ovl_want_write(struct dentry *dentry); |
| void ovl_drop_write(struct dentry *dentry); |
| bool ovl_dentry_is_opaque(struct dentry *dentry); |
| void ovl_dentry_set_opaque(struct dentry *dentry, bool opaque); |
| bool ovl_is_whiteout(struct dentry *dentry); |
| void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry); |
| struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, |
| unsigned int flags); |
| struct file *ovl_path_open(struct path *path, int flags); |
| |
| struct dentry *ovl_upper_create(struct dentry *upperdir, struct dentry *dentry, |
| struct kstat *stat, const char *link); |
| |
| /* 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); |
| |
| /* inode.c */ |
| int ovl_setattr(struct dentry *dentry, struct iattr *attr); |
| int ovl_permission(struct inode *inode, int mask); |
| int ovl_setxattr(struct dentry *dentry, const char *name, |
| const void *value, size_t size, int flags); |
| ssize_t ovl_getxattr(struct dentry *dentry, const char *name, |
| void *value, size_t size); |
| ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); |
| int ovl_removexattr(struct dentry *dentry, const char *name); |
| struct inode *ovl_d_select_inode(struct dentry *dentry, unsigned file_flags); |
| |
| struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, |
| struct ovl_entry *oe); |
| static inline void ovl_copyattr(struct inode *from, struct inode *to) |
| { |
| to->i_uid = from->i_uid; |
| to->i_gid = from->i_gid; |
| } |
| |
| /* dir.c */ |
| extern const struct inode_operations ovl_dir_inode_operations; |
| struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry); |
| int ovl_create_real(struct inode *dir, struct dentry *newdentry, |
| struct kstat *stat, const char *link, |
| 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_one(struct dentry *parent, struct dentry *dentry, |
| struct path *lowerpath, struct kstat *stat); |
| int ovl_copy_xattr(struct dentry *old, struct dentry *new); |
| int ovl_set_attr(struct dentry *upper, struct kstat *stat); |