From e4826691cc7e5458bcb659935d0092bcf3f08c20 Mon Sep 17 00:00:00 2001 From: Brian Foster Date: Wed, 10 Feb 2021 17:27:20 -0800 Subject: xfs: restore shutdown check in mapped write fault path XFS triggers an iomap warning in the write fault path due to a !PageUptodate() page if a write fault happens to occur on a page that recently failed writeback. The iomap writeback error handling code can clear the Uptodate flag if no portion of the page is submitted for I/O. This is reproduced by fstest generic/019, which combines various forms of I/O with simulated disk failures that inevitably lead to filesystem shutdown (which then unconditionally fails page writeback). This is a regression introduced by commit f150b4234397 ("xfs: split the iomap ops for buffered vs direct writes") due to the removal of a shutdown check and explicit error return in the ->iomap_begin() path used by the write fault path. The explicit error return historically translated to a SIGBUS, but now carries on with iomap processing where it complains about the unexpected state. Restore the shutdown check to xfs_buffered_write_iomap_begin() to restore historical behavior. Fixes: f150b4234397 ("xfs: split the iomap ops for buffered vs direct writes") Signed-off-by: Brian Foster Reviewed-by: Eric Sandeen Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong --- fs/xfs/xfs_iomap.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'fs/xfs') diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 70c341658c01..6594f572096e 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -860,6 +860,9 @@ xfs_buffered_write_iomap_begin( int allocfork = XFS_DATA_FORK; int error = 0; + if (XFS_FORCED_SHUTDOWN(mp)) + return -EIO; + /* we can't use delayed allocations when using extent size hints */ if (xfs_get_extsz_hint(ip)) return xfs_direct_write_iomap_begin(inode, offset, count, -- cgit v1.2.3