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xfs: add repair helpers for the reference count btree 

Add a couple of functions to the refcount btree and generic btree code
that will be used to repair the refcountbt.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2018-05-09 10:02:03 -07:00
parent 4d4f86b49f
commit 08daa3ccf5
4 changed files with 41 additions and 0 deletions
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21
fs/xfs/libxfs/xfs_btree.c
View File

@ -4919,3 +4919,24 @@ xfs_btree_has_record(
*exists = false;
return error;
}
/* Are there more records in this btree? */
bool
xfs_btree_has_more_records(
struct xfs_btree_cur *cur)
{
struct xfs_btree_block *block;
struct xfs_buf *bp;
block = xfs_btree_get_block(cur, 0, &bp);
/* There are still records in this block. */
if (cur->bc_ptrs[0] < xfs_btree_get_numrecs(block))
return true;
/* There are more record blocks. */
if (cur->bc_flags & XFS_BTREE_LONG_PTRS)
return block->bb_u.l.bb_rightsib != cpu_to_be64(NULLFSBLOCK);
else
return block->bb_u.s.bb_rightsib != cpu_to_be32(NULLAGBLOCK);
}

1
fs/xfs/libxfs/xfs_btree.h
View File

@ -528,5 +528,6 @@ union xfs_btree_key *xfs_btree_high_key_from_key(struct xfs_btree_cur *cur,
union xfs_btree_key *key);
int xfs_btree_has_record(struct xfs_btree_cur *cur, union xfs_btree_irec *low,
union xfs_btree_irec *high, bool *exists);
bool xfs_btree_has_more_records(struct xfs_btree_cur *cur);
#endif /* __XFS_BTREE_H__ */

17
fs/xfs/libxfs/xfs_refcount.c
View File

@ -88,6 +88,23 @@ xfs_refcount_lookup_ge(
return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
}
/*
* Look up the first record equal to [bno, len] in the btree
* given by cur.
*/
int
xfs_refcount_lookup_eq(
struct xfs_btree_cur *cur,
xfs_agblock_t bno,
int *stat)
{
trace_xfs_refcount_lookup(cur->bc_mp, cur->bc_private.a.agno, bno,
XFS_LOOKUP_LE);
cur->bc_rec.rc.rc_startblock = bno;
cur->bc_rec.rc.rc_blockcount = 0;
return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
}
/* Convert on-disk record to in-core format. */
void
xfs_refcount_btrec_to_irec(

2
fs/xfs/libxfs/xfs_refcount.h
View File

@ -24,6 +24,8 @@ extern int xfs_refcount_lookup_le(struct xfs_btree_cur *cur,
xfs_agblock_t bno, int *stat);
extern int xfs_refcount_lookup_ge(struct xfs_btree_cur *cur,
xfs_agblock_t bno, int *stat);
extern int xfs_refcount_lookup_eq(struct xfs_btree_cur *cur,
xfs_agblock_t bno, int *stat);
extern int xfs_refcount_get_rec(struct xfs_btree_cur *cur,
struct xfs_refcount_irec *irec, int *stat);