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xfs: error out when a superblock buffer update reduces the agcount

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commit b882b0f8138ffa935834e775953f1630f89bbb62 upstream.

XFS currently does not support reducing the agcount, so error out if
a logged sb buffer tries to shrink the agcount.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
Signed-off-by: Catherine Hoang <catherine.hoang@oracle.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Hellwig
2025-02-05 13:40:20 -08:00
committed by Greg Kroah-Hartman
parent a9c1ebae75
commit 5a9f827998
1 changed files with 5 additions and 0 deletions
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5
fs/xfs/xfs_buf_item_recover.c
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@@ -713,6 +713,11 @@ xlog_recover_do_primary_sb_buffer(
*/
xfs_sb_from_disk(&mp->m_sb, dsb);
if (mp->m_sb.sb_agcount < orig_agcount) {
xfs_alert(mp, "Shrinking AG count in log recovery not supported");
return -EFSCORRUPTED;
}
/*
* Initialize the new perags, and also update various block and inode
* allocator setting based off the number of AGs or total blocks.