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xfs: check that the rtrefcount maxlevels doesn't increase when growing fs

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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" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2024-11-20 16:21:04 -08:00
parent 8e84e8052b
commit 88a70768df
2 changed files with 4 additions and 0 deletions
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2
fs/xfs/xfs_fsops.c
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@ -23,6 +23,7 @@
#include "xfs_trace.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
@ -231,6 +232,7 @@ xfs_growfs_data_private(
/* Compute new maxlevels for rt btrees. */
xfs_rtrmapbt_compute_maxlevels(mp);
xfs_rtrefcountbt_compute_maxlevels(mp);
}
return error;

2
fs/xfs/xfs_rtalloc.c
View File

@ -995,6 +995,7 @@ xfs_growfs_rt_bmblock(
*/
mp->m_features |= XFS_FEAT_REALTIME;
xfs_rtrmapbt_compute_maxlevels(mp);
xfs_rtrefcountbt_compute_maxlevels(mp);
kfree(nmp);
return 0;
@ -1178,6 +1179,7 @@ xfs_growfs_check_rtgeom(
nmp->m_sb.sb_dblocks = dblocks;
xfs_rtrmapbt_compute_maxlevels(nmp);
xfs_rtrefcountbt_compute_maxlevels(nmp);
xfs_trans_resv_calc(nmp, M_RES(nmp));
/*