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fs: dcache: Use READ_ONCE when accessing i_dir_seq

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i_dir_seq is subject to concurrent modification by a cmpxchg or
store-release operation, so ensure that the relaxed access in
d_alloc_parallel uses READ_ONCE.

Reported-by: Peter Zijlstra <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Will Deacon authored and Al Viro committed 2018-02-25 12:51:10 -05:00
1 parent 015555fd4d
commit 8cc07c808c
1 file changed
+1 -1
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fs/dcache.c
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@@ -2507,7 +2507,7 @@ retry:
}
hlist_bl_lock(b);
if (unlikely(parent->d_inode->i_dir_seq != seq)) {
if (unlikely(READ_ONCE(parent->d_inode->i_dir_seq) != seq)) {
hlist_bl_unlock(b);
rcu_read_unlock();
goto retry;