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| author | Andreas Gruenbacher <agruenba@redhat.com> | 2019-03-06 15:41:57 +0100 |
|---|---|---|
| committer | Andreas Gruenbacher <agruenba@redhat.com> | 2019-03-08 15:49:01 +0100 |
| commit | 605b0487f0bc1ae9963bf52ece0f5c8055186f81 (patch) | |
| tree | d6cdf2eb071b40386ca7b75573b377d3413e35a0 | |
| parent | 7c03e756b449218b1bddf8e00a12ec7a6be62664 (diff) | |
| download | linux-605b0487f0bc1ae9963bf52ece0f5c8055186f81.tar.bz2 | |
gfs2: Fix missed wakeups in find_insert_glock
Mark Syms has reported seeing tasks that are stuck waiting in
find_insert_glock. It turns out that struct lm_lockname contains four padding
bytes on 64-bit architectures that function glock_waitqueue doesn't skip when
hashing the glock name. As a result, we can end up waking up the wrong
waitqueue, and the waiting tasks may be stuck forever.
Fix that by using ht_parms.key_len instead of sizeof(struct lm_lockname) for
the key length.
Reported-by: Mark Syms <mark.syms@citrix.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
| -rw-r--r-- | fs/gfs2/glock.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index f66773c71bcd..d32964cd1117 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -107,7 +107,7 @@ static int glock_wake_function(wait_queue_entry_t *wait, unsigned int mode, static wait_queue_head_t *glock_waitqueue(struct lm_lockname *name) { - u32 hash = jhash2((u32 *)name, sizeof(*name) / 4, 0); + u32 hash = jhash2((u32 *)name, ht_parms.key_len / 4, 0); return glock_wait_table + hash_32(hash, GLOCK_WAIT_TABLE_BITS); } |