From: Christoph Hellwig hch@lst.de
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 --- fs/xfs/xfs_buf_item_recover.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/fs/xfs/xfs_buf_item_recover.c b/fs/xfs/xfs_buf_item_recover.c index b9fd22891052..66a7e7201d17 100644 --- a/fs/xfs/xfs_buf_item_recover.c +++ b/fs/xfs/xfs_buf_item_recover.c @@ -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.