From 46fc58dacf6e9b00629c57998a8a23f85c262b3f Mon Sep 17 00:00:00 2001 From: Brian Foster Date: Thu, 4 Jun 2015 13:03:34 +1000 Subject: [PATCH] xfs: check min blks for random debug mode sparse allocations The inode allocator enables random sparse inode chunk allocations in DEBUG mode to facilitate testing. Sparse inode allocations are not always possible, however, depending on the fs geometry. For example, there is no possibility for a sparse inode allocation on filesystems where the block size is large enough to fit one or more inode chunks within a single block. Fix up the DEBUG mode sparse inode allocation logic to trigger random sparse allocations only when the geometry of the fs allows it. Signed-off-by: Brian Foster Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- fs/xfs/libxfs/xfs_ialloc.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c index c6d684ed84d0..52553b854771 100644 --- a/fs/xfs/libxfs/xfs_ialloc.c +++ b/fs/xfs/libxfs/xfs_ialloc.c @@ -606,20 +606,20 @@ xfs_ialloc_ag_alloc( uint16_t allocmask = (uint16_t) -1; /* init. to full chunk */ struct xfs_inobt_rec_incore rec; struct xfs_perag *pag; - int do_sparse = 0; -#ifdef DEBUG - /* randomly do sparse inode allocations */ - if (xfs_sb_version_hassparseinodes(&tp->t_mountp->m_sb)) - do_sparse = prandom_u32() & 1; -#endif - memset(&args, 0, sizeof(args)); args.tp = tp; args.mp = tp->t_mountp; args.fsbno = NULLFSBLOCK; +#ifdef DEBUG + /* randomly do sparse inode allocations */ + if (xfs_sb_version_hassparseinodes(&tp->t_mountp->m_sb) && + args.mp->m_ialloc_min_blks < args.mp->m_ialloc_blks) + do_sparse = prandom_u32() & 1; +#endif + /* * Locking will ensure that we don't have two callers in here * at one time. @@ -768,6 +768,7 @@ sparse_alloc: return error; newlen = args.len << args.mp->m_sb.sb_inopblog; + ASSERT(newlen <= XFS_INODES_PER_CHUNK); allocmask = (1 << (newlen / XFS_INODES_PER_HOLEMASK_BIT)) - 1; } -- 2.34.1