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 @@ -1390,7 +1390,8 @@ 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)