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xfs: actually check xfs_btree_check_block return in xfs_btree_islastblock

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Coverity points out that xfs_btree_islastblock doesn't check the return
value of xfs_btree_check_block.  Since the question "Does the cursor
point to the last block in this level?" only makes sense if the caller
previously performed a lookup or seek operation, the block should
already have been checked.

Therefore, check the return value in an ASSERT and turn the whole thing
into a static inline predicate.

Coverity-id: 114069
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2019-11-06 08:47:09 -08:00
parent 23220fe260
commit 27d9ee577d
2 changed files with 17 additions and 27 deletions
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19
fs/xfs/libxfs/xfs_btree.c
View File

@ -716,25 +716,6 @@ xfs_btree_get_bufs(
return xfs_trans_get_buf(tp, mp->m_ddev_targp, d, mp->m_bsize, 0);
}
/*
* Check for the cursor referring to the last block at the given level.
*/
int /* 1=is last block, 0=not last block */
xfs_btree_islastblock(
xfs_btree_cur_t *cur, /* btree cursor */
int level) /* level to check */
{
struct xfs_btree_block *block; /* generic btree block pointer */
xfs_buf_t *bp; /* buffer containing block */
block = xfs_btree_get_block(cur, level, &bp);
xfs_btree_check_block(cur, block, level, bp);
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);
}
/*
* Change the cursor to point to the first record at the given level.
* Other levels are unaffected.

25
fs/xfs/libxfs/xfs_btree.h
View File

@ -317,14 +317,6 @@ xfs_btree_get_bufs(
xfs_agnumber_t agno, /* allocation group number */
xfs_agblock_t agbno); /* allocation group block number */
/*
* Check for the cursor referring to the last block at the given level.
*/
int /* 1=is last block, 0=not last block */
xfs_btree_islastblock(
xfs_btree_cur_t *cur, /* btree cursor */
int level); /* level to check */
/*
* Compute first and last byte offsets for the fields given.
* Interprets the offsets table, which contains struct field offsets.
@ -524,4 +516,21 @@ 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);
/* Does this cursor point to the last block in the given level? */
static inline bool
xfs_btree_islastblock(
xfs_btree_cur_t *cur,
int level)
{
struct xfs_btree_block *block;
struct xfs_buf *bp;
block = xfs_btree_get_block(cur, level, &bp);
ASSERT(block && xfs_btree_check_block(cur, block, level, bp) == 0);
if (cur->bc_flags & XFS_BTREE_LONG_PTRS)
return block->bb_u.l.bb_rightsib == cpu_to_be64(NULLFSBLOCK);
return block->bb_u.s.bb_rightsib == cpu_to_be32(NULLAGBLOCK);
}
#endif /* __XFS_BTREE_H__ */