From 85bcfa26f9a3782be37d4feafd49668b98b8bdbe Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Wed, 16 Mar 2022 13:38:43 -0700 Subject: [PATCH] xfs: don't report reserved bnobt space as available On a modern filesystem, we don't allow userspace to allocate blocks for data storage from the per-AG space reservations, the user-controlled reservation pool that prevents ENOSPC in the middle of internal operations, or the internal per-AG set-aside that prevents unwanted filesystem shutdowns due to ENOSPC during a bmap btree split. Since we now consider freespace btree blocks as unavailable for allocation for data storage, we shouldn't report those blocks via statfs either. This makes the numbers that we return via the statfs f_bavail and f_bfree fields a more conservative estimate of actual free space. Signed-off-by: Darrick J. Wong Reviewed-by: Brian Foster Reviewed-by: Dave Chinner --- fs/xfs/xfs_fsops.c | 2 +- fs/xfs/xfs_super.c | 3 ++- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c index 5b5b68affe66..196e2c51309c 100644 --- a/fs/xfs/xfs_fsops.c +++ b/fs/xfs/xfs_fsops.c @@ -347,7 +347,7 @@ xfs_fs_counts( cnt->allocino = percpu_counter_read_positive(&mp->m_icount); cnt->freeino = percpu_counter_read_positive(&mp->m_ifree); cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) - - mp->m_alloc_set_aside; + xfs_fdblocks_unavailable(mp); spin_lock(&mp->m_sb_lock); cnt->freertx = mp->m_sb.sb_frextents; diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index d84714e4e46a..54be9d64093e 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -815,7 +815,8 @@ xfs_fs_statfs( spin_unlock(&mp->m_sb_lock); /* make sure statp->f_bfree does not underflow */ - statp->f_bfree = max_t(int64_t, fdblocks - mp->m_alloc_set_aside, 0); + statp->f_bfree = max_t(int64_t, 0, + fdblocks - xfs_fdblocks_unavailable(mp)); statp->f_bavail = statp->f_bfree; fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);