Commit 21ec5416 authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

xfs: create block pointer check functions 



Create some helper functions to check that a block pointer points
within the filesystem (or AG) and doesn't point at static metadata.
We will use this for scrub.

Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
parent ed438b47

fs/xfs/libxfs/xfs_alloc.c

+49 −0
Original line number Diff line number Diff line
@@ -2931,3 +2931,52 @@ xfs_alloc_query_all( 
	query.fn = fn;

	return xfs_btree_query_all(cur, xfs_alloc_query_range_helper, &query);

}



/* Find the size of the AG, in blocks. */

xfs_agblock_t

xfs_ag_block_count(

	struct xfs_mount	*mp,

	xfs_agnumber_t		agno)

{

	ASSERT(agno < mp->m_sb.sb_agcount);



	if (agno < mp->m_sb.sb_agcount - 1)

		return mp->m_sb.sb_agblocks;

	return mp->m_sb.sb_dblocks - (agno * mp->m_sb.sb_agblocks);

}



/*

 * Verify that an AG block number pointer neither points outside the AG

 * nor points at static metadata.

 */

bool

xfs_verify_agbno(

	struct xfs_mount	*mp,

	xfs_agnumber_t		agno,

	xfs_agblock_t		agbno)

{

	xfs_agblock_t		eoag;



	eoag = xfs_ag_block_count(mp, agno);

	if (agbno >= eoag)

		return false;

	if (agbno <= XFS_AGFL_BLOCK(mp))

		return false;

	return true;

}



/*

 * Verify that an FS block number pointer neither points outside the

 * filesystem nor points at static AG metadata.

 */

bool

xfs_verify_fsbno(

	struct xfs_mount	*mp,

	xfs_fsblock_t		fsbno)

{

	xfs_agnumber_t		agno = XFS_FSB_TO_AGNO(mp, fsbno);



	if (agno >= mp->m_sb.sb_agcount)

		return false;

	return xfs_verify_agbno(mp, agno, XFS_FSB_TO_AGBNO(mp, fsbno));

}

fs/xfs/libxfs/xfs_alloc.h

+4 −0
Original line number Diff line number Diff line
@@ -232,5 +232,9 @@ int xfs_alloc_query_range(struct xfs_btree_cur *cur, 
		xfs_alloc_query_range_fn fn, void *priv);

int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn,

		void *priv);

xfs_agblock_t xfs_ag_block_count(struct xfs_mount *mp, xfs_agnumber_t agno);

bool xfs_verify_agbno(struct xfs_mount *mp, xfs_agnumber_t agno,

		xfs_agblock_t agbno);

bool xfs_verify_fsbno(struct xfs_mount *mp, xfs_fsblock_t fsbno);



#endif	/* __XFS_ALLOC_H__ */

fs/xfs/libxfs/xfs_rtbitmap.c

+12 −0
Original line number Diff line number Diff line
@@ -1086,3 +1086,15 @@ xfs_rtalloc_query_all( 


	return xfs_rtalloc_query_range(tp, &keys[0], &keys[1], fn, priv);

}



/*

 * Verify that an realtime block number pointer doesn't point off the

 * end of the realtime device.

 */

bool

xfs_verify_rtbno(

	struct xfs_mount	*mp,

	xfs_rtblock_t		rtbno)

{

	return rtbno < mp->m_sb.sb_rblocks;

}

fs/xfs/xfs_rtalloc.h

+2 −0
Original line number Diff line number Diff line
@@ -138,6 +138,7 @@ int xfs_rtalloc_query_range(struct xfs_trans *tp, 
int xfs_rtalloc_query_all(struct xfs_trans *tp,

			  xfs_rtalloc_query_range_fn fn,

			  void *priv);

bool xfs_verify_rtbno(struct xfs_mount *mp, xfs_rtblock_t rtbno);

#else

# define xfs_rtallocate_extent(t,b,min,max,l,f,p,rb)    (ENOSYS)

# define xfs_rtfree_extent(t,b,l)                       (ENOSYS)
@@ -146,6 +147,7 @@ int xfs_rtalloc_query_all(struct xfs_trans *tp, 
# define xfs_rtalloc_query_range(t,l,h,f,p)             (ENOSYS)

# define xfs_rtalloc_query_all(t,f,p)                   (ENOSYS)

# define xfs_rtbuf_get(m,t,b,i,p)                       (ENOSYS)

# define xfs_verify_rtbno(m, r)			(false)

static inline int		/* error */

xfs_rtmount_init(

	xfs_mount_t	*mp)	/* file system mount structure */

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