GFS2: Stop block extents at the end of bitmaps
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>
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c743ffd09f
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@ -1834,8 +1834,7 @@ static void gfs2_alloc_extent(const struct gfs2_rbm *rbm, bool dinode,
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block++;
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while (*n < elen) {
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ret = gfs2_rbm_from_block(&pos, block);
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WARN_ON(ret);
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if (gfs2_testbit(&pos) != GFS2_BLKST_FREE)
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if (ret || gfs2_testbit(&pos) != GFS2_BLKST_FREE)
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break;
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gfs2_trans_add_bh(pos.rgd->rd_gl, pos.bi->bi_bh, 1);
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gfs2_setbit(&pos, true, GFS2_BLKST_USED);
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