linux/fs/xfs/scrub/attr.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2017-2023 Oracle.  All Rights Reserved.
 * Author: Darrick J. Wong <[email protected]>
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_log_format.h"
#include "xfs_trans.h"
#include "xfs_inode.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_attr.h"
#include "xfs_attr_leaf.h"
#include "xfs_attr_sf.h"
#include "xfs_parent.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/dabtree.h"
#include "scrub/attr.h"
#include "scrub/listxattr.h"
#include "scrub/repair.h"

/* Free the buffers linked from the xattr buffer. */
static void
xchk_xattr_buf_cleanup(
	void			*priv)
{ … }

/*
 * Allocate the free space bitmap if we're trying harder; there are leaf blocks
 * in the attr fork; or we can't tell if there are leaf blocks.
 */
static inline bool
xchk_xattr_want_freemap(
	struct xfs_scrub	*sc)
{ … }

/*
 * Allocate enough memory to hold an attr value and attr block bitmaps,
 * reallocating the buffer if necessary.  Buffer contents are not preserved
 * across a reallocation.
 */
int
xchk_setup_xattr_buf(
	struct xfs_scrub	*sc,
	size_t			value_size)
{ … }

/* Set us up to scrub an inode's extended attributes. */
int
xchk_setup_xattr(
	struct xfs_scrub	*sc)
{ … }

/* Extended Attributes */

/*
 * Check that an extended attribute key can be looked up by hash.
 *
 * We use the extended attribute walk helper to call this function for every
 * attribute key in an inode.  Once we're here, we load the attribute value to
 * see if any errors happen, or if we get more or less data than we expected.
 */
static int
xchk_xattr_actor(
	struct xfs_scrub	*sc,
	struct xfs_inode	*ip,
	unsigned int		attr_flags,
	const unsigned char	*name,
	unsigned int		namelen,
	const void		*value,
	unsigned int		valuelen,
	void			*priv)
{ … }

/*
 * Mark a range [start, start+len) in this map.  Returns true if the
 * region was free, and false if there's a conflict or a problem.
 *
 * Within a char, the lowest bit of the char represents the byte with
 * the smallest address
 */
bool
xchk_xattr_set_map(
	struct xfs_scrub	*sc,
	unsigned long		*map,
	unsigned int		start,
	unsigned int		len)
{ … }

/*
 * Check the leaf freemap from the usage bitmap.  Returns false if the
 * attr freemap has problems or points to used space.
 */
STATIC bool
xchk_xattr_check_freemap(
	struct xfs_scrub		*sc,
	struct xfs_attr3_icleaf_hdr	*leafhdr)
{ … }

/*
 * Check this leaf entry's relations to everything else.
 * Returns the number of bytes used for the name/value data.
 */
STATIC void
xchk_xattr_entry(
	struct xchk_da_btree		*ds,
	int				level,
	char				*buf_end,
	struct xfs_attr_leafblock	*leaf,
	struct xfs_attr3_icleaf_hdr	*leafhdr,
	struct xfs_attr_leaf_entry	*ent,
	int				idx,
	unsigned int			*usedbytes,
	__u32				*last_hashval)
{ … }

/* Scrub an attribute leaf. */
STATIC int
xchk_xattr_block(
	struct xchk_da_btree		*ds,
	int				level)
{ … }

/* Scrub a attribute btree record. */
STATIC int
xchk_xattr_rec(
	struct xchk_da_btree		*ds,
	int				level)
{ … }

/* Check space usage of shortform attrs. */
STATIC int
xchk_xattr_check_sf(
	struct xfs_scrub		*sc)
{ … }

/* Scrub the extended attribute metadata. */
int
xchk_xattr(
	struct xfs_scrub		*sc)
{ … }