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gfs2: Fix loop in gfs2_rbm_find

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commit 2d29f6b96d8f80322ed2dd895bca590491c38d34 upstream.

Fix the resource group wrap-around logic in gfs2_rbm_find that commit
e579ed4f44 broke.  The bug can lead to unnecessary repeated scanning of the
same bitmaps; there is a risk that future changes will turn this into an
endless loop.

Fixes: e579ed4f44 ("GFS2: Introduce rbm field bii")
Cc: stable@vger.kernel.org # v3.13+
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andreas Gruenbacher 2018-12-04 15:06:27 +01:00 • committed by Greg Kroah-Hartman
parent bf72973ce1
commit 1845189826
1 changed files with 1 additions and 1 deletions
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2
fs/gfs2/rgrp.c
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@ -1720,9 +1720,9 @@ static int gfs2_rbm_find(struct gfs2_rbm *rbm, u8 state, u32 *minext,
goto next_iter;
}
if (ret == -E2BIG) {
n += rbm->bii - initial_bii;
rbm->bii = 0;
rbm->offset = 0;
n += (rbm->bii - initial_bii);
goto res_covered_end_of_rgrp;
}
return ret;