Messages in this thread Patch in this message | | | From | Steven Whitehouse <> | Subject | [PATCH 22/27] GFS2: Stop block extents at the end of bitmaps | Date | Wed, 26 Sep 2012 09:25:43 +0100 |
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From: Bob Peterson <rpeterso@redhat.com>
This patch stops multiple block allocations if a nonzero return code is received from gfs2_rbm_from_block. Without this patch, if enough pressure is put on the file system, you get a kernel warning quickly followed by: BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffffa04f47e8>] gfs2_alloc_blocks+0x2c8/0x880 [gfs2] With this patch, things run normally.
Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index 8869541..defb826 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -1834,8 +1834,7 @@ static void gfs2_alloc_extent(const struct gfs2_rbm *rbm, bool dinode, block++; while (*n < elen) { ret = gfs2_rbm_from_block(&pos, block); - WARN_ON(ret); - if (gfs2_testbit(&pos) != GFS2_BLKST_FREE) + if (ret || gfs2_testbit(&pos) != GFS2_BLKST_FREE) break; gfs2_trans_add_bh(pos.rgd->rd_gl, pos.bi->bi_bh, 1); gfs2_setbit(&pos, true, GFS2_BLKST_USED); -- 1.7.4
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