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authorMike Kravetz <mike.kravetz@oracle.com>2019-05-14 03:22:55 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-14 19:47:50 +0300
commitf27a5136f70a8c90e8b30a983b6f54540742f849 (patch)
treed8c614cbaa67b50e754c37ff250e9d9722293772 /fs/hugetlbfs
parent1f862989b04ade61d3aab49184c50e9957f84c7d (diff)
downloadlinux-f27a5136f70a8c90e8b30a983b6f54540742f849.tar.xz
hugetlbfs: always use address space in inode for resv_map pointer
Continuing discussion about 58b6e5e8f1ad ("hugetlbfs: fix memory leak for resv_map") brought up the issue that inode->i_mapping may not point to the address space embedded within the inode at inode eviction time. The hugetlbfs truncate routine handles this by explicitly using inode->i_data. However, code cleaning up the resv_map will still use the address space pointed to by inode->i_mapping. Luckily, private_data is NULL for address spaces in all such cases today but, there is no guarantee this will continue. Change all hugetlbfs code getting a resv_map pointer to explicitly get it from the address space embedded within the inode. In addition, add more comments in the code to indicate why this is being done. Link: http://lkml.kernel.org/r/20190419204435.16984-1-mike.kravetz@oracle.com Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> Reported-by: Yufen Yu <yuyufen@huawei.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/hugetlbfs')
-rw-r--r--fs/hugetlbfs/inode.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index f23237135163..1dcc57189382 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -497,8 +497,15 @@ static void hugetlbfs_evict_inode(struct inode *inode)
struct resv_map *resv_map;
remove_inode_hugepages(inode, 0, LLONG_MAX);
- resv_map = (struct resv_map *)inode->i_mapping->private_data;
- /* root inode doesn't have the resv_map, so we should check it */
+
+ /*
+ * Get the resv_map from the address space embedded in the inode.
+ * This is the address space which points to any resv_map allocated
+ * at inode creation time. If this is a device special inode,
+ * i_mapping may not point to the original address space.
+ */
+ resv_map = (struct resv_map *)(&inode->i_data)->private_data;
+ /* Only regular and link inodes have associated reserve maps */
if (resv_map)
resv_map_release(&resv_map->refs);
clear_inode(inode);