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gfs2: new slab for transactions

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This patch adds a new slab for gfs2 transactions. That allows us to
reduce kernel memory fragmentation, have better organization of data
for analysis of vmcore dumps. A new centralized function is added to
free the slab objects, and it exposes use-after-free by giving
warnings if a transaction is freed while it still has bd elements
attached to its buffers or ail lists. We make sure to initialize
those transaction ail lists so we can check their integrity when freeing.

At a later time, we should add a slab initialization function to
make it more efficient, but for this initial patch I wanted to
minimize the impact.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Bob Peterson
2019-04-17 12:04:27 -06:00
committed by Andreas Gruenbacher
parent cbcc89b630
commit b839dadae8
6 changed files with 32 additions and 8 deletions
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9
fs/gfs2/main.c
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@@ -143,6 +143,12 @@ static int __init init_gfs2_fs(void)
if (!gfs2_qadata_cachep)
goto fail_cachep7;
gfs2_trans_cachep = kmem_cache_create("gfs2_trans",
sizeof(struct gfs2_trans),
0, 0, NULL);
if (!gfs2_trans_cachep)
goto fail_cachep8;
error = register_shrinker(&gfs2_qd_shrinker);
if (error)
goto fail_shrinker;
@@ -194,6 +200,8 @@ fail_fs2:
fail_fs1:
unregister_shrinker(&gfs2_qd_shrinker);
fail_shrinker:
kmem_cache_destroy(gfs2_trans_cachep);
fail_cachep8:
kmem_cache_destroy(gfs2_qadata_cachep);
fail_cachep7:
kmem_cache_destroy(gfs2_quotad_cachep);
@@ -236,6 +244,7 @@ static void __exit exit_gfs2_fs(void)
rcu_barrier();
mempool_destroy(gfs2_page_pool);
kmem_cache_destroy(gfs2_trans_cachep);
kmem_cache_destroy(gfs2_qadata_cachep);
kmem_cache_destroy(gfs2_quotad_cachep);
kmem_cache_destroy(gfs2_rgrpd_cachep);