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Commit 93b84462 authored by Darrick J. Wong's avatar Darrick J. Wong Committed by Greg Kroah-Hartman
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fs: clear writeback errors in inode_init_always 



[ Upstream commit 829bc787c1a0403e4d886296dd4d90c5f9c1744a ]

In inode_init_always(), we clear the inode mapping flags, which clears
any retained error (AS_EIO, AS_ENOSPC) bits.  Unfortunately, we do not
also clear wb_err, which means that old mapping errors can leak through
to new inodes.

This is crucial for the XFS inode allocation path because we recycle old
in-core inodes and we do not want error state from an old file to leak
into the new file.  This bug was discovered by running generic/036 and
generic/047 in a loop and noticing that the EIOs generated by the
collision of direct and buffered writes in generic/036 would survive the
remount between 036 and 047, and get reported to the fsyncs (on
different files!) in generic/047.

Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarJeff Layton <jlayton@kernel.org>
Reviewed-by: default avatarBrian Foster <bfoster@redhat.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ae14c044

fs/inode.c

+1 −0
Original line number Diff line number Diff line
@@ -177,6 +177,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode) 
	mapping->a_ops = &empty_aops;

	mapping->host = inode;

	mapping->flags = 0;

	mapping->wb_err = 0;

	atomic_set(&mapping->i_mmap_writable, 0);

	mapping_set_gfp_mask(mapping, GFP_HIGHUSER_MOVABLE);

	mapping->private_data = NULL;