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xfs: compute maximum AG btree height for critical reservation calculation

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Compute the actual maximum AG btree height for deciding if a per-AG
block reservation is critically low.  This only affects the sanity check
condition, since we /generally/ will trigger on the 10% threshold.  This
is a long-winded way of saying that we're removing one more usage of
XFS_BTREE_MAXLEVELS.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2021-09-16 12:27:34 -07:00
parent 7cb3efb4cf
commit b74e15d720
3 changed files with 17 additions and 1 deletions
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3
fs/xfs/libxfs/xfs_ag_resv.c
View file

@ -91,7 +91,8 @@ xfs_ag_resv_critical(
trace_xfs_ag_resv_critical(pag, type, avail);
/* Critically low if less than 10% or max btree height remains. */
return XFS_TEST_ERROR(avail < orig / 10 || avail < XFS_BTREE_MAXLEVELS,
return XFS_TEST_ERROR(avail < orig / 10 ||
avail < pag->pag_mount->m_agbtree_maxlevels,
pag->pag_mount, XFS_ERRTAG_AG_RESV_CRITICAL);
}

14
fs/xfs/xfs_mount.c
View file

@ -567,6 +567,18 @@ xfs_mount_setup_inode_geom(
xfs_ialloc_setup_geometry(mp);
}
/* Compute maximum possible height for per-AG btree types for this fs. */
static inline void
xfs_agbtree_compute_maxlevels(
struct xfs_mount *mp)
{
unsigned int levels;
levels = max(mp->m_alloc_maxlevels, M_IGEO(mp)->inobt_maxlevels);
levels = max(levels, mp->m_rmap_maxlevels);
mp->m_agbtree_maxlevels = max(levels, mp->m_refc_maxlevels);
}
/*
* This function does the following on an initial mount of a file system:
* - reads the superblock from disk and init the mount struct
@ -638,6 +650,8 @@ xfs_mountfs(
xfs_rmapbt_compute_maxlevels(mp);
xfs_refcountbt_compute_maxlevels(mp);
xfs_agbtree_compute_maxlevels(mp);
/*
* Check if sb_agblocks is aligned at stripe boundary. If sb_agblocks
* is NOT aligned turn off m_dalign since allocator alignment is within

1
fs/xfs/xfs_mount.h
View file

@ -132,6 +132,7 @@ typedef struct xfs_mount {
uint m_bm_maxlevels[2]; /* max bmap btree levels */
uint m_rmap_maxlevels; /* max rmap btree levels */
uint m_refc_maxlevels; /* max refcount btree level */
unsigned int m_agbtree_maxlevels; /* max level of all AG btrees */
xfs_extlen_t m_ag_prealloc_blocks; /* reserved ag blocks */
uint m_alloc_set_aside; /* space we can't use */
uint m_ag_max_usable; /* max space per AG */