btrfs: handle idmaps in btrfs_new_inode()

Extend btrfs_new_inode() to take the idmapped mount into account when
initializing a new inode. This is just a matter of passing down the
mount's userns. The rest is taken care of in inode_init_owner(). This is
a preliminary patch to make the individual btrfs inode operations
idmapped mount aware.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 09bd7c1..0f9017a 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6422,6 +6422,7 @@ static void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
 
 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
                                     struct btrfs_root *root,
+                                    struct user_namespace *mnt_userns,
                                     struct inode *dir,
                                     const char *name, int name_len,
                                     u64 ref_objectid, u64 objectid,
@@ -6531,7 +6532,7 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
        if (ret != 0)
                goto fail_unlock;
 
-       inode_init_owner(&init_user_ns, inode, dir, mode);
+       inode_init_owner(mnt_userns, inode, dir, mode);
        inode_set_bytes(inode, 0);
 
        inode->i_mtime = current_time(inode);
@@ -6716,9 +6717,9 @@ static int btrfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
        if (err)
                goto out_unlock;
 
-       inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
-                       dentry->d_name.len, btrfs_ino(BTRFS_I(dir)), objectid,
-                       mode, &index);
+       inode = btrfs_new_inode(trans, root, &init_user_ns, dir,
+                       dentry->d_name.name, dentry->d_name.len,
+                       btrfs_ino(BTRFS_I(dir)), objectid, mode, &index);
        if (IS_ERR(inode)) {
                err = PTR_ERR(inode);
                inode = NULL;
@@ -6780,9 +6781,9 @@ static int btrfs_create(struct user_namespace *mnt_userns, struct inode *dir,
        if (err)
                goto out_unlock;
 
-       inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
-                       dentry->d_name.len, btrfs_ino(BTRFS_I(dir)), objectid,
-                       mode, &index);
+       inode = btrfs_new_inode(trans, root, &init_user_ns, dir,
+                       dentry->d_name.name, dentry->d_name.len,
+                       btrfs_ino(BTRFS_I(dir)), objectid, mode, &index);
        if (IS_ERR(inode)) {
                err = PTR_ERR(inode);
                inode = NULL;
@@ -6925,8 +6926,9 @@ static int btrfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
        if (err)
                goto out_fail;
 
-       inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
-                       dentry->d_name.len, btrfs_ino(BTRFS_I(dir)), objectid,
+       inode = btrfs_new_inode(trans, root, &init_user_ns, dir,
+                       dentry->d_name.name, dentry->d_name.len,
+                       btrfs_ino(BTRFS_I(dir)), objectid,
                        S_IFDIR | mode, &index);
        if (IS_ERR(inode)) {
                err = PTR_ERR(inode);
@@ -9038,7 +9040,8 @@ int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
        if (err < 0)
                return err;
 
-       inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, ino, ino,
+       inode = btrfs_new_inode(trans, new_root, &init_user_ns, NULL, "..", 2,
+                               ino, ino,
                                S_IFDIR | (~current_umask() & S_IRWXUGO),
                                &index);
        if (IS_ERR(inode))
@@ -9559,7 +9562,7 @@ static int btrfs_whiteout_for_rename(struct btrfs_trans_handle *trans,
        if (ret)
                return ret;
 
-       inode = btrfs_new_inode(trans, root, dir,
+       inode = btrfs_new_inode(trans, root, &init_user_ns, dir,
                                dentry->d_name.name,
                                dentry->d_name.len,
                                btrfs_ino(BTRFS_I(dir)),
@@ -10071,9 +10074,10 @@ static int btrfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
        if (err)
                goto out_unlock;
 
-       inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
-                               dentry->d_name.len, btrfs_ino(BTRFS_I(dir)),
-                               objectid, S_IFLNK|S_IRWXUGO, &index);
+       inode = btrfs_new_inode(trans, root, &init_user_ns, dir,
+                               dentry->d_name.name, dentry->d_name.len,
+                               btrfs_ino(BTRFS_I(dir)), objectid,
+                               S_IFLNK | S_IRWXUGO, &index);
        if (IS_ERR(inode)) {
                err = PTR_ERR(inode);
                inode = NULL;
@@ -10422,7 +10426,7 @@ static int btrfs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
        if (ret)
                goto out;
 
-       inode = btrfs_new_inode(trans, root, dir, NULL, 0,
+       inode = btrfs_new_inode(trans, root, &init_user_ns, dir, NULL, 0,
                        btrfs_ino(BTRFS_I(dir)), objectid, mode, &index);
        if (IS_ERR(inode)) {
                ret = PTR_ERR(inode);