[PATCH 1/2] Revert "fs: make vfs_fileattr_[get|set] return -EOPNOTSUPP"

[Andrey Albershteyn <aalbersh@redhat.com>]

This reverts commit 474b155adf3927d2c944423045757b54aa1ca4de.

This patch caused regression in ioctl_setflags(). Underlying filesystems
use EOPNOTSUPP to indicate that flag is not supported. This error is
also gets converted in ioctl_setflags(). Therefore, for unsupported
flags error changed from EOPNOSUPP to ENOIOCTLCMD.

Link: https://lore.kernel.org/linux-xfs/a622643f-1585-40b0-9441-cf7ece176e83@kernel.org/
Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>
---
 fs/file_attr.c         | 12 ++----------
 fs/fuse/ioctl.c        |  4 ----
 fs/overlayfs/copy_up.c |  2 +-
 fs/overlayfs/inode.c   |  5 ++++-
 4 files changed, 7 insertions(+), 16 deletions(-)

diff --git a/fs/file_attr.c b/fs/file_attr.c
index 12424d4945d0..460b2dd21a85 100644
--- a/fs/file_attr.c
+++ b/fs/file_attr.c
@@ -84,7 +84,7 @@ int vfs_fileattr_get(struct dentry *dentry, struct file_kattr *fa)
 	int error;
 
 	if (!inode->i_op->fileattr_get)
-		return -EOPNOTSUPP;
+		return -ENOIOCTLCMD;
 
 	error = security_inode_file_getattr(dentry, fa);
 	if (error)
@@ -270,7 +270,7 @@ int vfs_fileattr_set(struct mnt_idmap *idmap, struct dentry *dentry,
 	int err;
 
 	if (!inode->i_op->fileattr_set)
-		return -EOPNOTSUPP;
+		return -ENOIOCTLCMD;
 
 	if (!inode_owner_or_capable(idmap, inode))
 		return -EPERM;
@@ -312,8 +312,6 @@ int ioctl_getflags(struct file *file, unsigned int __user *argp)
 	int err;
 
 	err = vfs_fileattr_get(file->f_path.dentry, &fa);
-	if (err == -EOPNOTSUPP)
-		err = -ENOIOCTLCMD;
 	if (!err)
 		err = put_user(fa.flags, argp);
 	return err;
@@ -335,8 +333,6 @@ int ioctl_setflags(struct file *file, unsigned int __user *argp)
 			fileattr_fill_flags(&fa, flags);
 			err = vfs_fileattr_set(idmap, dentry, &fa);
 			mnt_drop_write_file(file);
-			if (err == -EOPNOTSUPP)
-				err = -ENOIOCTLCMD;
 		}
 	}
 	return err;
@@ -349,8 +345,6 @@ int ioctl_fsgetxattr(struct file *file, void __user *argp)
 	int err;
 
 	err = vfs_fileattr_get(file->f_path.dentry, &fa);
-	if (err == -EOPNOTSUPP)
-		err = -ENOIOCTLCMD;
 	if (!err)
 		err = copy_fsxattr_to_user(&fa, argp);
 
@@ -371,8 +365,6 @@ int ioctl_fssetxattr(struct file *file, void __user *argp)
 		if (!err) {
 			err = vfs_fileattr_set(idmap, dentry, &fa);
 			mnt_drop_write_file(file);
-			if (err == -EOPNOTSUPP)
-				err = -ENOIOCTLCMD;
 		}
 	}
 	return err;
diff --git a/fs/fuse/ioctl.c b/fs/fuse/ioctl.c
index 57032eadca6c..fdc175e93f74 100644
--- a/fs/fuse/ioctl.c
+++ b/fs/fuse/ioctl.c
@@ -536,8 +536,6 @@ int fuse_fileattr_get(struct dentry *dentry, struct file_kattr *fa)
 cleanup:
 	fuse_priv_ioctl_cleanup(inode, ff);
 
-	if (err == -ENOTTY)
-		err = -EOPNOTSUPP;
 	return err;
 }
 
@@ -574,7 +572,5 @@ int fuse_fileattr_set(struct mnt_idmap *idmap,
 cleanup:
 	fuse_priv_ioctl_cleanup(inode, ff);
 
-	if (err == -ENOTTY)
-		err = -EOPNOTSUPP;
 	return err;
 }
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 27396fe63f6d..20c92ea58093 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -178,7 +178,7 @@ static int ovl_copy_fileattr(struct inode *inode, const struct path *old,
 	err = ovl_real_fileattr_get(old, &oldfa);
 	if (err) {
 		/* Ntfs-3g returns -EINVAL for "no fileattr support" */
-		if (err == -EOPNOTSUPP || err == -EINVAL)
+		if (err == -ENOTTY || err == -EINVAL)
 			return 0;
 		pr_warn("failed to retrieve lower fileattr (%pd2, err=%i)\n",
 			old->dentry, err);
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index ecb9f2019395..d4722e1b83bc 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -720,7 +720,10 @@ int ovl_real_fileattr_get(const struct path *realpath, struct file_kattr *fa)
 	if (err)
 		return err;
 
-	return vfs_fileattr_get(realpath->dentry, fa);
+	err = vfs_fileattr_get(realpath->dentry, fa);
+	if (err == -ENOIOCTLCMD)
+		err = -ENOTTY;
+	return err;
 }
 
 int ovl_fileattr_get(struct dentry *dentry, struct file_kattr *fa)

-- 
2.51.0