[PATCH 5.19 179/717] ntfs3: rework xattr handlers and switch to POSIX ACL VFS helpers

Greg Kroah-Hartman
2022-10-22T07:50:43Z

From: Christian Brauner <brauner@kernel.org>

[ Upstream commit a26aa12384158116c0d80d50e0bdc7b3323551e2 ]

The xattr code in ntfs3 is currently a bit confused. For example, it
defines a POSIX ACL i_op->set_acl() method but instead of relying on the
generic POSIX ACL VFS helpers it defines its own set of xattr helpers
with the consequence that i_op->set_acl() is currently dead code.

Switch ntfs3 to rely on the VFS POSIX ACL xattr handlers. Also remove
i_op->{g,s}et_acl() methods from symlink inode operations. Symlinks
don't support xattrs.

This is a preliminary change for the following patches which move
handling idmapped mounts directly in posix_acl_xattr_set().

This survives POSIX ACL xfstests.

Fixes: be71b5cba2e6 ("fs/ntfs3: Add attrib operations")
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Reviewed-by: Seth Forshee (DigitalOcean) <sforshee@kernel.org>>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/ntfs3/inode.c | 2 -
fs/ntfs3/xattr.c | 102 +++--------------------------------------------
2 files changed, 6 insertions(+), 98 deletions(-)

diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c
index 803ff4c63c31..3b94ad22d9c0 100644
--- a/fs/ntfs3/inode.c
+++ b/fs/ntfs3/inode.c
@@ -1941,8 +1941,6 @@ const struct inode_operations ntfs_link_inode_operations = {
.setattr = ntfs3_setattr,
.listxattr = ntfs_listxattr,
.permission = ntfs_permission,
- .get_acl = ntfs_get_acl,
- .set_acl = ntfs_set_acl,
};

const struct address_space_operations ntfs_aops = {
diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c
index e3d443ccb9be..19ce48726b00 100644
--- a/fs/ntfs3/xattr.c
+++ b/fs/ntfs3/xattr.c
@@ -625,67 +625,6 @@ int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
return ntfs_set_acl_ex(mnt_userns, inode, acl, type, false);
}

-static int ntfs_xattr_get_acl(struct user_namespace *mnt_userns,
- struct inode *inode, int type, void *buffer,
- size_t size)
-{
- struct posix_acl *acl;
- int err;
-
- if (!(inode->i_sb->s_flags & SB_POSIXACL)) {
- ntfs_inode_warn(inode, "add mount option \"acl\" to use acl");
- return -EOPNOTSUPP;
- }
-
- acl = ntfs_get_acl(inode, type, false);
- if (IS_ERR(acl))
- return PTR_ERR(acl);
-
- if (!acl)
- return -ENODATA;
-
- err = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
- posix_acl_release(acl);
-
- return err;
-}
-
-static int ntfs_xattr_set_acl(struct user_namespace *mnt_userns,
- struct inode *inode, int type, const void *value,
- size_t size)
-{
- struct posix_acl *acl;
- int err;
-
- if (!(inode->i_sb->s_flags & SB_POSIXACL)) {
- ntfs_inode_warn(inode, "add mount option \"acl\" to use acl");
- return -EOPNOTSUPP;
- }
-
- if (!inode_owner_or_capable(mnt_userns, inode))
- return -EPERM;
-
- if (!value) {
- acl = NULL;
- } else {
- acl = posix_acl_from_xattr(&init_user_ns, value, size);
- if (IS_ERR(acl))
- return PTR_ERR(acl);
-
- if (acl) {
- err = posix_acl_valid(&init_user_ns, acl);
- if (err)
- goto release_and_out;
- }
- }
-
- err = ntfs_set_acl(mnt_userns, inode, acl, type);
-
-release_and_out:
- posix_acl_release(acl);
- return err;
-}
-
/*
* ntfs_init_acl - Initialize the ACLs of a new inode.
*
@@ -852,23 +791,6 @@ static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de,
goto out;
}

-#ifdef CONFIG_NTFS3_FS_POSIX_ACL
- if ((name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 &&
- !memcmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
- sizeof(XATTR_NAME_POSIX_ACL_ACCESS))) ||
- (name_len == sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1 &&
- !memcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
- sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) {
- /* TODO: init_user_ns? */
- err = ntfs_xattr_get_acl(
- &init_user_ns, inode,
- name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1
- ? ACL_TYPE_ACCESS
- : ACL_TYPE_DEFAULT,
- buffer, size);
- goto out;
- }
-#endif
/* Deal with NTFS extended attribute. */
err = ntfs_get_ea(inode, name, name_len, buffer, size, NULL);

@@ -981,22 +903,6 @@ static noinline int ntfs_setxattr(const struct xattr_handler *handler,
goto out;
}

-#ifdef CONFIG_NTFS3_FS_POSIX_ACL
- if ((name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 &&
- !memcmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
- sizeof(XATTR_NAME_POSIX_ACL_ACCESS))) ||
- (name_len == sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1 &&
- !memcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
- sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) {
- err = ntfs_xattr_set_acl(
- mnt_userns, inode,
- name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1
- ? ACL_TYPE_ACCESS
- : ACL_TYPE_DEFAULT,
- value, size);
- goto out;
- }
-#endif
/* Deal with NTFS extended attribute. */
err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0);

@@ -1086,7 +992,7 @@ static bool ntfs_xattr_user_list(struct dentry *dentry)
}

// clang-format off
-static const struct xattr_handler ntfs_xattr_handler = {
+static const struct xattr_handler ntfs_other_xattr_handler = {
.prefix = "",
.get = ntfs_getxattr,
.set = ntfs_setxattr,
@@ -1094,7 +1000,11 @@ static const struct xattr_handler ntfs_xattr_handler = {
};

const struct xattr_handler *ntfs_xattr_handlers[] = {
- &ntfs_xattr_handler,
+#ifdef CONFIG_NTFS3_FS_POSIX_ACL
+ &posix_acl_access_xattr_handler,
+ &posix_acl_default_xattr_handler,
+#endif
+ &ntfs_other_xattr_handler,
NULL,
};
// clang-format on
--
2.35.1