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GFS2: Protect freeing directory hash table with i_lock spin_lock 

This patch changes function gfs2_dir_hash_inval so it uses the
i_lock spin_lock to protect the in-core hash table, i_hash_cache.
This will prevent double-frees due to a race between gfs2_evict_inode
and inode invalidation.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Bob Peterson 2015-10-29 10:03:41 -05:00
parent f3dd164912
commit c36b97e943
1 changed files with 6 additions and 1 deletions
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7
fs/gfs2/dir.c
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@ -388,8 +388,13 @@ static __be64 *gfs2_dir_get_hash_table(struct gfs2_inode *ip)
*/
void gfs2_dir_hash_inval(struct gfs2_inode *ip)
{
__be64 *hc = ip->i_hash_cache;
__be64 *hc;
spin_lock(&ip->i_inode.i_lock);
hc = ip->i_hash_cache;
ip->i_hash_cache = NULL;
spin_unlock(&ip->i_inode.i_lock);
kvfree(hc);
}