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gfs2: don't allow releasepage to free bd still used for revokes

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Before this patch, function gfs2_releasepage would free any bd
elements that had been used for the page being released. However,
those bd elements may still be queued to the sd_log_revokes list,
in which case we cannot free them until the revoke has been issued.

This patch adds additional checks for bds that are still being
used for revokes.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Bob Peterson 2020-02-17 14:14:13 -06:00
parent ca399c96e9
commit 019dd669bd
1 changed files with 8 additions and 3 deletions
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11
fs/gfs2/aops.c
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@ -805,11 +805,16 @@ int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
bd = bh->b_private;
if (bd) {
gfs2_assert_warn(sdp, bd->bd_bh == bh);
if (!list_empty(&bd->bd_list))
list_del_init(&bd->bd_list);
bd->bd_bh = NULL;
bh->b_private = NULL;
kmem_cache_free(gfs2_bufdata_cachep, bd);
/*
* The bd may still be queued as a revoke, in which
* case we must not dequeue nor free it.
*/
if (!bd->bd_blkno && !list_empty(&bd->bd_list))
list_del_init(&bd->bd_list);
if (list_empty(&bd->bd_list))
kmem_cache_free(gfs2_bufdata_cachep, bd);
}
bh = bh->b_this_page;