diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2017-05-23 21:53:36 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-17 06:41:50 +0200 |
| commit | 2557969fb4f703f1364a58fabde53e6567b46120 (patch) | |
| tree | df1d5762ad61396098831d05be201646a88cc1ed /fs | |
| parent | 44bc7cae603167feb86b7f8f0684df62ffaac7f4 (diff) | |
gfs2: Use rhashtable walk interface in glock_hash_walk
[ Upstream commit 6a25478077d987edc5e2f880590a2bc5fcab4441 ]
The function glock_hash_walk walks the rhashtable by hand. This
is broken because if it catches the hash table in the middle of
a rehash, then it will miss entries.
This patch replaces the manual walk by using the rhashtable walk
interface.
Fixes: 88ffbf3e037e ("GFS2: Use resizable hash table for glocks")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/gfs2/glock.c | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index 133f322573b5..6528724ad6e5 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -1425,26 +1425,32 @@ static struct shrinker glock_shrinker = { * @sdp: the filesystem * @bucket: the bucket * + * Note that the function can be called multiple times on the same + * object. So the user must ensure that the function can cope with + * that. */ static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp) { struct gfs2_glock *gl; - struct rhash_head *pos; - const struct bucket_table *tbl; - int i; + struct rhashtable_iter iter; - rcu_read_lock(); - tbl = rht_dereference_rcu(gl_hash_table.tbl, &gl_hash_table); - for (i = 0; i < tbl->size; i++) { - rht_for_each_entry_rcu(gl, pos, tbl, i, gl_node) { + rhashtable_walk_enter(&gl_hash_table, &iter); + + do { + gl = ERR_PTR(rhashtable_walk_start(&iter)); + if (gl) + continue; + + while ((gl = rhashtable_walk_next(&iter)) && !IS_ERR(gl)) if ((gl->gl_name.ln_sbd == sdp) && lockref_get_not_dead(&gl->gl_lockref)) examiner(gl); - } - } - rcu_read_unlock(); - cond_resched(); + + rhashtable_walk_stop(&iter); + } while (cond_resched(), gl == ERR_PTR(-EAGAIN)); + + rhashtable_walk_exit(&iter); } /** |