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orangefs: have ..._clean_interrupted_...() wait for copy to/from daemon 

* turn all those list_del(&op->list) into list_del_init()
* don't pick ops that are already given up in control device
  ->read()/->write_iter().
* have orangefs_clean_interrupted_operation() notice if op is currently
  being copied to/from daemon (by said ->read()/->write_iter()) and
  wait for that to finish.
* when we are done copying to/from daemon and find that it had been
  given up while we were doing that, wake the waiting ..._clean_interrupted_...

As the result, we are guaranteed that orangefs_clean_interrupted_operation(op)
doesn't return until nobody else can see op.  Moreover, we don't need to play
with op refcounts anymore.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
This commit is contained in:
Al Viro 2016-02-18 18:59:44 -05:00 committed by Mike Marshall
parent 5964c1b839
commit 05a50a5be8
3 changed files with 21 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
fs/orangefs/devorangefs-req.c
View File

@ -58,9 +58,9 @@ static struct orangefs_kernel_op_s *orangefs_devreq_remove_op(__u64 tag)
next,
&htable_ops_in_progress[index],
list) {
if (op->tag == tag && !op_state_purged(op)) {
if (op->tag == tag && !op_state_purged(op) &&
!op_state_given_up(op)) {
list_del_init(&op->list);
get_op(op); /* increase ref count. */
spin_unlock(&htable_ops_in_progress_lock);
return op;
}
@ -133,7 +133,7 @@ restart:
__s32 fsid;
/* This lock is held past the end of the loop when we break. */
spin_lock(&op->lock);
if (unlikely(op_state_purged(op))) {
if (unlikely(op_state_purged(op) || op_state_given_up(op))) {
spin_unlock(&op->lock);
continue;
}
@ -199,13 +199,12 @@ restart:
*/
if (op_state_in_progress(cur_op) || op_state_serviced(cur_op)) {
gossip_err("orangefs: ERROR: Current op already queued.\n");
list_del(&cur_op->list);
list_del_init(&cur_op->list);
spin_unlock(&cur_op->lock);
spin_unlock(&orangefs_request_list_lock);
return -EAGAIN;
}
list_del_init(&cur_op->list);
get_op(op);
spin_unlock(&orangefs_request_list_lock);
spin_unlock(&cur_op->lock);
@ -230,7 +229,7 @@ restart:
if (unlikely(op_state_given_up(cur_op))) {
spin_unlock(&cur_op->lock);
spin_unlock(&htable_ops_in_progress_lock);
op_release(cur_op);
complete(&cur_op->waitq);
goto restart;
}
@ -242,7 +241,6 @@ restart:
orangefs_devreq_add_op(cur_op);
spin_unlock(&cur_op->lock);
spin_unlock(&htable_ops_in_progress_lock);
op_release(cur_op);
/* The client only asks to read one size buffer. */
return MAX_DEV_REQ_UPSIZE;
@ -258,10 +256,12 @@ error:
if (likely(!op_state_given_up(cur_op))) {
set_op_state_waiting(cur_op);
list_add(&cur_op->list, &orangefs_request_list);
spin_unlock(&cur_op->lock);
} else {
spin_unlock(&cur_op->lock);
complete(&cur_op->waitq);
}
spin_unlock(&cur_op->lock);
spin_unlock(&orangefs_request_list_lock);
op_release(cur_op);
return -EFAULT;
}
@ -405,11 +405,11 @@ wakeup:
put_cancel(op);
} else if (unlikely(op_state_given_up(op))) {
spin_unlock(&op->lock);
complete(&op->waitq);
} else {
set_op_state_serviced(op);
spin_unlock(&op->lock);
}
op_release(op);
return ret;
Efault:

2
fs/orangefs/orangefs-kernel.h
View File

@ -259,7 +259,7 @@ static inline void set_op_state_purged(struct orangefs_kernel_op_s *op)
{
spin_lock(&op->lock);
if (unlikely(op_is_cancel(op))) {
list_del(&op->list);
list_del_init(&op->list);
spin_unlock(&op->lock);
put_cancel(op);
} else {

22
fs/orangefs/waitqueue.c
View File

@ -208,15 +208,20 @@ static void orangefs_clean_up_interrupted_operation(struct orangefs_kernel_op_s
* Called with op->lock held.
*/
op->op_state |= OP_VFS_STATE_GIVEN_UP;
if (op_state_waiting(op)) {
/* from that point on it can't be moved by anybody else */
if (list_empty(&op->list)) {
/* caught copying to/from daemon */
BUG_ON(op_state_serviced(op));
spin_unlock(&op->lock);
wait_for_completion(&op->waitq);
} else if (op_state_waiting(op)) {
/*
* upcall hasn't been read; remove op from upcall request
* list.
*/
spin_unlock(&op->lock);
spin_lock(&orangefs_request_list_lock);
list_del(&op->list);
list_del_init(&op->list);
spin_unlock(&orangefs_request_list_lock);
gossip_debug(GOSSIP_WAIT_DEBUG,
"Interrupted: Removed op %p from request_list\n",
@ -225,23 +230,16 @@ static void orangefs_clean_up_interrupted_operation(struct orangefs_kernel_op_s
/* op must be removed from the in progress htable */
spin_unlock(&op->lock);
spin_lock(&htable_ops_in_progress_lock);
list_del(&op->list);
list_del_init(&op->list);
spin_unlock(&htable_ops_in_progress_lock);
gossip_debug(GOSSIP_WAIT_DEBUG,
"Interrupted: Removed op %p"
" from htable_ops_in_progress\n",
op);
} else if (!op_state_serviced(op)) {
} else {
spin_unlock(&op->lock);
gossip_err("interrupted operation is in a weird state 0x%x\n",
op->op_state);
} else {
/*
* It is not intended for execution to flow here,
* but having this unlock here makes sparse happy.
*/
gossip_err("%s: can't get here.\n", __func__);
spin_unlock(&op->lock);
}
reinit_completion(&op->waitq);
}