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ntfs3: rework xattr handlers and switch to POSIX ACL VFS helpers

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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: be71b5cba2 ("fs/ntfs3: Add attrib operations")
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Reviewed-by: Seth Forshee (DigitalOcean) <sforshee@kernel.org>>
This commit is contained in:
Christian Brauner 2022-08-29 14:38:40 +02:00 committed by Christian Brauner (Microsoft)
parent b90cb10531
commit a26aa12384
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
2 changed files with 6 additions and 98 deletions
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2
fs/ntfs3/inode.c
View File

@ -1927,8 +1927,6 @@ 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 = {

102
fs/ntfs3/xattr.c
View File

@ -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