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fs: make helpers idmap mount aware

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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>
This commit is contained in:
Christian Brauner
2021-01-21 14:19:43 +01:00
parent 1ab29965b3
commit 549c729771
182 changed files with 1121 additions and 756 deletions
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6
drivers/android/binderfs.c
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@@ -355,7 +355,8 @@ static inline bool is_binderfs_control_device(const struct dentry *dentry)
return info->control_dentry == dentry;
}
static int binderfs_rename(struct inode *old_dir, struct dentry *old_dentry,
static int binderfs_rename(struct user_namespace *mnt_userns,
struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags)
{
@@ -363,7 +364,8 @@ static int binderfs_rename(struct inode *old_dir, struct dentry *old_dentry,
is_binderfs_control_device(new_dentry))
return -EPERM;
return simple_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
return simple_rename(&init_user_ns, old_dir, old_dentry, new_dir,
new_dentry, flags);
}
static int binderfs_unlink(struct inode *dir, struct dentry *dentry)