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authorChristian Brauner <brauner@kernel.org>2023-01-13 14:49:15 +0300
committerChristian Brauner (Microsoft) <brauner@kernel.org>2023-01-19 11:24:26 +0300
commitc54bd91e9eaba43f09aadc25b52ea869ff3b5587 (patch)
tree08e662315661f5bde154c28e5c06701f37172753 /fs/ext4/namei.c
parent7a77db95511c39be4b2db2ceca152ef589adc2dc (diff)
downloadlinux-c54bd91e9eaba43f09aadc25b52ea869ff3b5587.tar.xz
fs: port ->mkdir() to pass mnt_idmap
Convert to struct mnt_idmap. Last cycle we merged the necessary infrastructure in 256c8aed2b42 ("fs: introduce dedicated idmap type for mounts"). This is just the conversion to struct mnt_idmap. Currently we still pass around the plain namespace that was attached to a mount. This is in general pretty convenient but it makes it easy to conflate namespaces that are relevant on the filesystem with namespaces that are relevent on the mount level. Especially for non-vfs developers without detailed knowledge in this area this can be a potential source for bugs. Once the conversion to struct mnt_idmap is done all helpers down to the really low-level helpers will take a struct mnt_idmap argument instead of two namespace arguments. This way it becomes impossible to conflate the two eliminating the possibility of any bugs. All of the vfs and all filesystems only operate on struct mnt_idmap. Acked-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Diffstat (limited to 'fs/ext4/namei.c')
-rw-r--r--fs/ext4/namei.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 11d9c1d1fc56..e5c54c30696e 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2973,9 +2973,10 @@ out:
return err;
}
-static int ext4_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+static int ext4_mkdir(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, umode_t mode)
{
+ struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
handle_t *handle;
struct inode *inode;
int err, err2 = 0, credits, retries = 0;