[26/42] xfs: check that the rtrefcount maxlevels doesn't increase when growing fs

Commit Message

Darrick J. Wong Dec. 30, 2022, 10:18 p.m. UTC

From: Darrick J. Wong <[e-mail]>

The size of filesystem transaction reservations depends on the maximum
height (maxlevels) of the realtime btrees.  Since we don't want a grow
operation to increase the reservation size enough that we'll fail the
minimum log size checks on the next mount, constrain growfs operations
if they would cause an increase in the rt refcount btree maxlevels.

Signed-off-by: Darrick J. Wong <[e-mail]>
---
 fs/xfs/xfs_fsops.c   |    2 ++
 fs/xfs/xfs_rtalloc.c |    2 ++
 2 files changed, 4 insertions(+)

Patch

diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index 65b44ad8884e..317f0461f490 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -24,6 +24,7 @@ 
 #include "xfs_rtgroup.h"
 #include "xfs_rtalloc.h"
 #include "xfs_rtrmap_btree.h"
+#include "xfs_rtrefcount_btree.h"
 
 /*
  * Write new AG headers to disk. Non-transactional, but need to be
@@ -225,6 +226,7 @@  xfs_growfs_data_private(
 
 		/* Compute new maxlevels for rt btrees. */
 		xfs_rtrmapbt_compute_maxlevels(mp);
+		xfs_rtrefcountbt_compute_maxlevels(mp);
 	}
 
 	return error;
diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 48c7cc28b7f2..7f1ee9432e71 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -1172,6 +1172,7 @@  xfs_growfs_check_rtgeom(
 		fake_mp->m_features |= XFS_FEAT_REALTIME;
 
 	xfs_rtrmapbt_compute_maxlevels(fake_mp);
+	xfs_rtrefcountbt_compute_maxlevels(fake_mp);
 
 	xfs_trans_resv_calc(fake_mp, M_RES(fake_mp));
 	min_logfsbs = xfs_log_calc_minimum_size(fake_mp);
@@ -1474,6 +1475,7 @@  xfs_growfs_rt(
 		 */
 		mp->m_features |= XFS_FEAT_REALTIME;
 		xfs_rtrmapbt_compute_maxlevels(mp);
+		xfs_rtrefcountbt_compute_maxlevels(mp);
 	}
 	if (error)
 		goto out_free;