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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Andrew Price <anprice@redhat.com>,
        Andreas Gruenbacher <agruenba@redhat.com>
Subject: [PATCH 4.14 191/284] gfs2: Make sure FITRIM minlen is rounded up to fs block size
Date:   Mon, 18 Apr 2022 14:12:52 +0200
Message-Id: <20220418121217.165187102@linuxfoundation.org>
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From: Andrew Price <anprice@redhat.com>

commit 27ca8273fda398638ca994a207323a85b6d81190 upstream.

Per fstrim(8) we must round up the minlen argument to the fs block size.
The current calculation doesn't take into account devices that have a
discard granularity and requested minlen less than 1 fs block, so the
value can get shifted away to zero in the translation to fs blocks.

The zero minlen passed to gfs2_rgrp_send_discards() then allows
sb_issue_discard() to be called with nr_sects == 0 which returns -EINVAL
and results in gfs2_rgrp_send_discards() returning -EIO.

Make sure minlen is never < 1 fs block by taking the max of the
requested minlen and the fs block size before comparing to the device's
discard granularity and shifting to fs blocks.

Fixes: 076f0faa764ab ("GFS2: Fix FITRIM argument handling")
Signed-off-by: Andrew Price <anprice@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/gfs2/rgrp.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1380,7 +1380,8 @@ int gfs2_fitrim(struct file *filp, void
 
 	start = r.start >> bs_shift;
 	end = start + (r.len >> bs_shift);
-	minlen = max_t(u64, r.minlen,
+	minlen = max_t(u64, r.minlen, sdp->sd_sb.sb_bsize);
+	minlen = max_t(u64, minlen,
 		       q->limits.discard_granularity) >> bs_shift;
 
 	if (end <= start || minlen > sdp->sd_max_rg_data)