goto out_drop_write;
}
+ if (attr->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
+ attr->ia_valid &= ~ATTR_MODE;
+
inode_lock(upperdentry->d_inode);
err = notify_change(upperdentry, attr, NULL);
if (!err)
int ovl_permission(struct inode *inode, int mask)
{
- struct ovl_entry *oe;
- struct dentry *alias = NULL;
- struct inode *realinode;
- struct dentry *realdentry;
+ struct ovl_entry *oe = inode->i_private;
bool is_upper;
+ struct dentry *realdentry = ovl_entry_real(oe, &is_upper);
+ struct inode *realinode;
int err;
- if (S_ISDIR(inode->i_mode)) {
- oe = inode->i_private;
- } else if (mask & MAY_NOT_BLOCK) {
- return -ECHILD;
- } else {
- /*
- * For non-directories find an alias and get the info
- * from there.
- */
- alias = d_find_any_alias(inode);
- if (WARN_ON(!alias))
- return -ENOENT;
-
- oe = alias->d_fsdata;
- }
-
- realdentry = ovl_entry_real(oe, &is_upper);
-
if (ovl_is_default_permissions(inode)) {
struct kstat stat;
struct path realpath = { .dentry = realdentry };
err = vfs_getattr(&realpath, &stat);
if (err)
- goto out_dput;
+ return err;
- err = -ESTALE;
if ((stat.mode ^ inode->i_mode) & S_IFMT)
- goto out_dput;
+ return -ESTALE;
inode->i_mode = stat.mode;
inode->i_uid = stat.uid;
inode->i_gid = stat.gid;
- err = generic_permission(inode, mask);
- goto out_dput;
+ return generic_permission(inode, mask);
}
/* Careful in RCU walk mode */
- realinode = ACCESS_ONCE(realdentry->d_inode);
+ realinode = d_inode_rcu(realdentry);
if (!realinode) {
WARN_ON(!(mask & MAY_NOT_BLOCK));
- err = -ENOENT;
- goto out_dput;
+ return -ENOENT;
}
if (mask & MAY_WRITE) {
* constructed return EROFS to prevent modification of
* upper layer.
*/
- err = -EROFS;
if (is_upper && !IS_RDONLY(inode) && IS_RDONLY(realinode) &&
(S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
- goto out_dput;
+ return -EROFS;
}
- err = __inode_permission(realinode, mask);
-out_dput:
- dput(alias);
- return err;
+ return __inode_permission(realinode, mask);
}
static const char *ovl_get_link(struct dentry *dentry,
return true;
}
-struct inode *ovl_d_select_inode(struct dentry *dentry, unsigned file_flags)
+int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags)
{
- int err;
+ int err = 0;
struct path realpath;
enum ovl_path_type type;
- if (d_is_dir(dentry))
- return d_backing_inode(dentry);
-
type = ovl_path_real(dentry, &realpath);
if (ovl_open_need_copy_up(file_flags, type, realpath.dentry)) {
err = ovl_want_write(dentry);
- if (err)
- return ERR_PTR(err);
-
- if (file_flags & O_TRUNC)
- err = ovl_copy_up_truncate(dentry);
- else
- err = ovl_copy_up(dentry);
- ovl_drop_write(dentry);
- if (err)
- return ERR_PTR(err);
-
- ovl_path_upper(dentry, &realpath);
+ if (!err) {
+ if (file_flags & O_TRUNC)
+ err = ovl_copy_up_truncate(dentry);
+ else
+ err = ovl_copy_up(dentry);
+ ovl_drop_write(dentry);
+ }
}
- if (realpath.dentry->d_flags & DCACHE_OP_SELECT_INODE)
- return realpath.dentry->d_op->d_select_inode(realpath.dentry, file_flags);
-
- return d_backing_inode(realpath.dentry);
+ return err;
}
static const struct inode_operations ovl_file_inode_operations = {
if (!inode)
return NULL;
- mode &= S_IFMT;
-
inode->i_ino = get_next_ino();
inode->i_mode = mode;
inode->i_flags |= S_NOATIME | S_NOCMTIME;
+ inode->i_private = oe;
+ mode &= S_IFMT;
switch (mode) {
case S_IFDIR:
- inode->i_private = oe;
inode->i_op = &ovl_dir_inode_operations;
inode->i_fop = &ovl_dir_operations;
break;