[Devel] [PATCH] fuse kio: Add comment about why we need to wait pending read requests

[Kirill Tkhai]

Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
---
 fs/fuse/kio/pcs/pcs_fuse_kdirect.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/fuse/kio/pcs/pcs_fuse_kdirect.c b/fs/fuse/kio/pcs/pcs_fuse_kdirect.c
index 3940d6c255ba..9b45fcbf8941 100644
--- a/fs/fuse/kio/pcs/pcs_fuse_kdirect.c
+++ b/fs/fuse/kio/pcs/pcs_fuse_kdirect.c
@@ -1081,7 +1081,12 @@ static void pcs_kio_setattr_handle(struct fuse_inode *fi, struct fuse_req *req)
 	r->end = req->end;
 	if (di->size.op == PCS_SIZE_SHRINK) {
 		BUG_ON(!mutex_is_locked(&req->io_inode->i_mutex));
-		/* wait for aio reads in flight */
+		/*
+		 * Wait for already submitted aio reads. Further reads
+		 * (including already queued to bg_queue) will be stopped
+		 * by wait_shrink(), and they will be processed from
+		 * _pcs_shrink_end().
+		 */
 		inode_dio_wait(req->io_inode);
 		/*
 		 * Writebackcache was flushed already so it is safe to