forked from Minki/linux
dm space map metadata: fix occasional leak of a metadata block on resize
The metadata space map has a simplified 'bootstrap' mode that is operational when extending the space maps. Whilst in this mode it's possible for some refcount decrement operations to become queued (eg, as a result of shadowing one of the bitmap indexes). These decrements were not being applied when switching out of bootstrap mode. The effect of this bug was the leaking of a 4k metadata block. This is detected by the latest version of thin_check as a non fatal error. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@vger.kernel.org
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@ -204,6 +204,27 @@ static void in(struct sm_metadata *smm)
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smm->recursion_count++;
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}
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static int apply_bops(struct sm_metadata *smm)
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{
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int r = 0;
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while (!brb_empty(&smm->uncommitted)) {
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struct block_op bop;
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r = brb_pop(&smm->uncommitted, &bop);
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if (r) {
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DMERR("bug in bop ring buffer");
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break;
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}
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r = commit_bop(smm, &bop);
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if (r)
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break;
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}
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return r;
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}
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static int out(struct sm_metadata *smm)
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{
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int r = 0;
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@ -216,21 +237,8 @@ static int out(struct sm_metadata *smm)
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return -ENOMEM;
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}
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if (smm->recursion_count == 1) {
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while (!brb_empty(&smm->uncommitted)) {
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struct block_op bop;
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r = brb_pop(&smm->uncommitted, &bop);
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if (r) {
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DMERR("bug in bop ring buffer");
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break;
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}
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r = commit_bop(smm, &bop);
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if (r)
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break;
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}
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}
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if (smm->recursion_count == 1)
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apply_bops(smm);
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smm->recursion_count--;
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@ -704,6 +712,12 @@ static int sm_metadata_extend(struct dm_space_map *sm, dm_block_t extra_blocks)
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}
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old_len = smm->begin;
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r = apply_bops(smm);
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if (r) {
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DMERR("%s: apply_bops failed", __func__);
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goto out;
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}
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r = sm_ll_commit(&smm->ll);
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if (r)
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goto out;
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@ -773,6 +787,12 @@ int dm_sm_metadata_create(struct dm_space_map *sm,
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if (r)
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return r;
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r = apply_bops(smm);
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if (r) {
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DMERR("%s: apply_bops failed", __func__);
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return r;
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}
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return sm_metadata_commit(sm);
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}
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