fs: make helpers idmap mount aware

Extend some inode methods with an additional user namespace argument. A
filesystem that is aware of idmapped mounts will receive the user
namespace the mount has been marked with. This can be used for
additional permission checking and also to enable filesystems to
translate between uids and gids if they need to. We have implemented all
relevant helpers in earlier patches.

As requested we simply extend the exisiting inode method instead of
introducing new ones. This is a little more code churn but it's mostly
mechanical and doesnt't leave us with additional inode methods.

Link: https://lore.kernel.org/r/20210121131959.646623-25-christian.brauner@ubuntu.com
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

1 files changed, 15 insertions, 10 deletions

diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index 2307bb0f6147..71e9c6abb2a6 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -62,19 +62,22 @@ extern void cifs_sb_deactive(struct super_block *sb);
 /* Functions related to inodes */
 extern const struct inode_operations cifs_dir_inode_ops;
 extern struct inode *cifs_root_iget(struct super_block *);
-extern int cifs_create(struct inode *, struct dentry *, umode_t,
-		       bool excl);
+extern int cifs_create(struct user_namespace *, struct inode *,
+		       struct dentry *, umode_t, bool excl);
 extern int cifs_atomic_open(struct inode *, struct dentry *,
 			    struct file *, unsigned, umode_t);
 extern struct dentry *cifs_lookup(struct inode *, struct dentry *,
 				  unsigned int);
 extern int cifs_unlink(struct inode *dir, struct dentry *dentry);
 extern int cifs_hardlink(struct dentry *, struct inode *, struct dentry *);
-extern int cifs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
-extern int cifs_mkdir(struct inode *, struct dentry *, umode_t);
+extern int cifs_mknod(struct user_namespace *, struct inode *, struct dentry *,
+		      umode_t, dev_t);
+extern int cifs_mkdir(struct user_namespace *, struct inode *, struct dentry *,
+		      umode_t);
 extern int cifs_rmdir(struct inode *, struct dentry *);
-extern int cifs_rename2(struct inode *, struct dentry *, struct inode *,
-			struct dentry *, unsigned int);
+extern int cifs_rename2(struct user_namespace *, struct inode *,
+			struct dentry *, struct inode *, struct dentry *,
+			unsigned int);
 extern int cifs_revalidate_file_attr(struct file *filp);
 extern int cifs_revalidate_dentry_attr(struct dentry *);
 extern int cifs_revalidate_file(struct file *filp);
@@ -82,8 +85,10 @@ extern int cifs_revalidate_dentry(struct dentry *);
 extern int cifs_invalidate_mapping(struct inode *inode);
 extern int cifs_revalidate_mapping(struct inode *inode);
 extern int cifs_zap_mapping(struct inode *inode);
-extern int cifs_getattr(const struct path *, struct kstat *, u32, unsigned int);
-extern int cifs_setattr(struct dentry *, struct iattr *);
+extern int cifs_getattr(struct user_namespace *, const struct path *,
+			struct kstat *, u32, unsigned int);
+extern int cifs_setattr(struct user_namespace *, struct dentry *,
+			struct iattr *);
 extern int cifs_fiemap(struct inode *, struct fiemap_extent_info *, u64 start,
 		       u64 len);
 
@@ -132,8 +137,8 @@ extern struct vfsmount *cifs_dfs_d_automount(struct path *path);
 /* Functions related to symlinks */
 extern const char *cifs_get_link(struct dentry *, struct inode *,
 			struct delayed_call *);
-extern int cifs_symlink(struct inode *inode, struct dentry *direntry,
-			const char *symname);
+extern int cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
+			struct dentry *direntry, const char *symname);
 
 #ifdef CONFIG_CIFS_XATTR
 extern const struct xattr_handler *cifs_xattr_handlers[];