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ceph: add comments for handle_cap_flush_ack logic 

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton 2020-03-18 15:34:20 -04:00 committed by Ilya Dryomov
parent 681ac63488
commit d7dbfb4f2b
1 changed files with 13 additions and 1 deletions
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14
fs/ceph/caps.c
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@ -3471,14 +3471,26 @@ static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
bool wake_mdsc = false;
list_for_each_entry_safe(cf, tmp_cf, &ci->i_cap_flush_list, i_list) {
/* Is this the one that was flushed? */
if (cf->tid == flush_tid)
cleaned = cf->caps;
if (cf->caps == 0) /* capsnap */
/* Is this a capsnap? */
if (cf->caps == 0)
continue;
if (cf->tid <= flush_tid) {
/*
* An earlier or current tid. The FLUSH_ACK should
* represent a superset of this flush's caps.
*/
wake_ci |= __detach_cap_flush_from_ci(ci, cf);
list_add_tail(&cf->i_list, &to_remove);
} else {
/*
* This is a later one. Any caps in it are still dirty
* so don't count them as cleaned.
*/
cleaned &= ~cf->caps;
if (!cleaned)
break;