xfs: fix xfs_error_get_cfg for negative errnos

xfs_error_get_cfg() is called with bp->b_error as an arg, which is
negative, so the switch statement won't ever find any matches.

This results in only the default error handler having any effect, as
EIO/ENOSPC/ENODEV get ignored due to the wrong sign.

It seems simplest to always flip the error sign to positive, so that
we can handle either negative errors in bp->b_error, or possibly a
positive errno via something like xfs_error_get_cfg(EIO) - this
future-proofs the function.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c
index 4c2c550..79cfd3f 100644 (file)
--- a/fs/xfs/xfs_sysfs.c
+++ b/fs/xfs/xfs_sysfs.c
@@ -634,6 +634,9 @@ xfs_error_get_cfg(
 {
        struct xfs_error_cfg    *cfg;
 
+       if (error < 0)
+               error = -error;
+
        switch (error) {
        case EIO:
                cfg = &mp->m_error_cfg[error_class][XFS_ERR_EIO];