[PATCH 1/9] pnfs: force a layout commit when encountering busy segments during recall

[Christoph Hellwig <hch@lst.de>]

Expedite layout recall processing by forcing a layout commit when
we see busy segments.  Without it the layout recall might have to wait
until the VM decided to start writeback for the file, which can introduce
long delays.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/nfs/callback_proc.c | 8 +++++++-
 fs/nfs/pnfs.c          | 3 +++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index 41db525..0d26951 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -171,6 +171,13 @@ static u32 initiate_file_draining(struct nfs_client *clp,
 		goto out;
 
 	ino = lo->plh_inode;
+
+	spin_lock(&ino->i_lock);
+	pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
+	spin_unlock(&ino->i_lock);
+
+	pnfs_layoutcommit_inode(ino, false);
+
 	spin_lock(&ino->i_lock);
 	if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
 	    pnfs_mark_matching_lsegs_invalid(lo, &free_me_list,
@@ -178,7 +185,6 @@ static u32 initiate_file_draining(struct nfs_client *clp,
 		rv = NFS4ERR_DELAY;
 	else
 		rv = NFS4ERR_NOMATCHING_LAYOUT;
-	pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
 	spin_unlock(&ino->i_lock);
 	pnfs_free_lseg_list(&free_me_list);
 	pnfs_put_layout_hdr(lo);
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 8827ab1..ce5d1ea 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -594,6 +594,9 @@ pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
 		dprintk("%s freeing layout for inode %lu\n", __func__,
 			lo->plh_inode->i_ino);
 		inode = lo->plh_inode;
+
+		pnfs_layoutcommit_inode(inode, false);
+
 		spin_lock(&inode->i_lock);
 		list_del_init(&lo->plh_bulk_destroy);
 		lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
-- 
1.9.1