From 578bd4ce7100ae34f98c6b0147fe75cfa0dadbac Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 11 Dec 2023 10:41:51 -0800 Subject: [PATCH] xfs: recompute growfsrtfree transaction reservation while growing rt volume While playing with growfs to create a 20TB realtime section on a filesystem that didn't previously have an rt section, I noticed that growfs would occasionally shut down the log due to a transaction reservation overflow. xfs_calc_growrtfree_reservation uses the current size of the realtime summary file (m_rsumsize) to compute the transaction reservation for a growrtfree transaction. The reservations are computed at mount time, which means that m_rsumsize is zero when growfs starts "freeing" the new realtime extents into the rt volume. As a result, the transaction is undersized and fails. Fix this by recomputing the transaction reservations every time we change m_rsumsize. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_rtalloc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c index 8feb58c6241ce..0c9893b9f2a99 100644 --- a/fs/xfs/xfs_rtalloc.c +++ b/fs/xfs/xfs_rtalloc.c @@ -1038,6 +1038,9 @@ xfs_growfs_rt( nrsumblocks = xfs_rtsummary_blockcount(mp, nrsumlevels, nsbp->sb_rbmblocks); nmp->m_rsumsize = nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks); + /* recompute growfsrt reservation from new rsumsize */ + xfs_trans_resv_calc(nmp, &nmp->m_resv); + /* * Start a transaction, get the log reservation. */ @@ -1124,6 +1127,8 @@ error_cancel: */ mp->m_rsumlevels = nrsumlevels; mp->m_rsumsize = nrsumsize; + /* recompute growfsrt reservation from new rsumsize */ + xfs_trans_resv_calc(mp, &mp->m_resv); error = xfs_trans_commit(tp); if (error) -- 2.30.2