diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/llite/statahead.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/llite/statahead.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/staging/lustre/lustre/llite/statahead.c b/drivers/staging/lustre/lustre/llite/statahead.c index 6ad9dd0fe2b3..b75562c6b5de 100644 --- a/drivers/staging/lustre/lustre/llite/statahead.c +++ b/drivers/staging/lustre/lustre/llite/statahead.c @@ -84,7 +84,7 @@ struct ll_sa_entry { struct qstr se_qstr; }; -static unsigned int sai_generation = 0; +static unsigned int sai_generation; static DEFINE_SPINLOCK(sai_generation_lock); static inline int ll_sa_entry_unhashed(struct ll_sa_entry *entry) @@ -706,11 +706,21 @@ static int ll_statahead_interpret(struct ptlrpc_request *req, struct ll_inode_info *lli = ll_i2info(dir); struct ll_statahead_info *sai = NULL; struct ll_sa_entry *entry; + __u64 handle = 0; int wakeup; if (it_disposition(it, DISP_LOOKUP_NEG)) rc = -ENOENT; + if (rc == 0) { + /* release ibits lock ASAP to avoid deadlock when statahead + * thread enqueues lock on parent in readdir and another + * process enqueues lock on child with parent lock held, eg. + * unlink. */ + handle = it->d.lustre.it_lock_handle; + ll_intent_drop_lock(it); + } + spin_lock(&lli->lli_sa_lock); /* stale entry */ if (unlikely(lli->lli_sai == NULL || @@ -745,8 +755,7 @@ static int ll_statahead_interpret(struct ptlrpc_request *req, * when statahead thread tries to enqueue lock on parent * for readpage and other tries to enqueue lock on child * with parent's lock held, for example: unlink. */ - entry->se_handle = it->d.lustre.it_lock_handle; - ll_intent_drop_lock(it); + entry->se_handle = handle; wakeup = sa_received_empty(sai); list_add_tail(&entry->se_list, &sai->sai_entries_received); |