fs/xfs/scrub/common.c

Source file repositories/reference/linux-study-clean/fs/xfs/scrub/common.c

File Facts

System
Linux kernel
Corpus path
fs/xfs/scrub/common.c
Extension
.c
Size
44658 bytes
Lines
1757
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct xchk_rmap_ownedby_info {
	const struct xfs_owner_info	*oinfo;
	xfs_filblks_t			*blocks;
};

STATIC int
xchk_count_rmap_ownedby_irec(
	struct xfs_btree_cur		*cur,
	const struct xfs_rmap_irec	*rec,
	void				*priv)
{
	struct xchk_rmap_ownedby_info	*sroi = priv;
	bool				irec_attr;
	bool				oinfo_attr;

	irec_attr = rec->rm_flags & XFS_RMAP_ATTR_FORK;
	oinfo_attr = sroi->oinfo->oi_flags & XFS_OWNER_INFO_ATTR_FORK;

	if (rec->rm_owner != sroi->oinfo->oi_owner)
		return 0;

	if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) || irec_attr == oinfo_attr)
		(*sroi->blocks) += rec->rm_blockcount;

	return 0;
}

/*
 * Calculate the number of blocks the rmap thinks are owned by something.
 * The caller should pass us an rmapbt cursor.
 */
int
xchk_count_rmap_ownedby_ag(
	struct xfs_scrub		*sc,
	struct xfs_btree_cur		*cur,
	const struct xfs_owner_info	*oinfo,
	xfs_filblks_t			*blocks)
{
	struct xchk_rmap_ownedby_info	sroi = {
		.oinfo			= oinfo,
		.blocks			= blocks,
	};

	*blocks = 0;
	return xfs_rmap_query_all(cur, xchk_count_rmap_ownedby_irec,
			&sroi);
}

/*
 * AG scrubbing
 *
 * These helpers facilitate locking an allocation group's header
 * buffers, setting up cursors for all btrees that are present, and
 * cleaning everything up once we're through.
 */

/* Decide if we want to return an AG header read failure. */
static inline bool
want_ag_read_header_failure(
	struct xfs_scrub	*sc,
	unsigned int		type)
{
	/* Return all AG header read failures when scanning btrees. */
	if (sc->sm->sm_type != XFS_SCRUB_TYPE_AGF &&
	    sc->sm->sm_type != XFS_SCRUB_TYPE_AGFL &&
	    sc->sm->sm_type != XFS_SCRUB_TYPE_AGI)
		return true;
	/*
	 * If we're scanning a given type of AG header, we only want to
	 * see read failures from that specific header.  We'd like the
	 * other headers to cross-check them, but this isn't required.
	 */
	if (sc->sm->sm_type == type)
		return true;
	return false;
}

/*
 * Grab the AG header buffers for the attached perag structure.
 *
 * The headers should be released by xchk_ag_free, but as a fail safe we attach
 * all the buffers we grab to the scrub transaction so they'll all be freed
 * when we cancel it.
 */
static inline int
xchk_perag_read_headers(
	struct xfs_scrub	*sc,
	struct xchk_ag		*sa)
{
	int			error;

Annotation

Implementation Notes