230 lines
7.6 KiB
C
230 lines
7.6 KiB
C
/*
|
|
*
|
|
* 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);
|