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linux-next/fs/proc/fd.h
Christian Brauner 549c729771
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>
2021-01-24 14:27:20 +01:00

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C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __PROCFS_FD_H__
#define __PROCFS_FD_H__
#include <linux/fs.h>
extern const struct file_operations proc_fd_operations;
extern const struct inode_operations proc_fd_inode_operations;
extern const struct file_operations proc_fdinfo_operations;
extern const struct inode_operations proc_fdinfo_inode_operations;
extern int proc_fd_permission(struct user_namespace *mnt_userns,
struct inode *inode, int mask);
static inline unsigned int proc_fd(struct inode *inode)
{
return PROC_I(inode)->fd;
}
#endif /* __PROCFS_FD_H__ */