From: Trond Myklebust <trond.myklebust@hammerspace.com>
Date: Tue, 24 Jun 2025 21:32:09 +0000 (-0400)
Subject: NFS: Allow folio migration for the case of mode == MIGRATE_SYNC
X-Git-Tag: io_uring-6.17-20250815~23^2~31
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=72508db0fe1762f2cfcff1cb4cf28a8e645bdd43;p=linux-block.git

NFS: Allow folio migration for the case of mode == MIGRATE_SYNC

When the mode is MIGRATE_SYNC, we are allowed to call nfs_wb_folio()
under the folio lock.

Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 374fc6b34c79..0dd22983f0d0 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -2113,8 +2113,12 @@ int nfs_migrate_folio(struct address_space *mapping, struct folio *dst,
 	 *        that we can safely release the inode reference while holding
 	 *        the folio lock.
 	 */
-	if (folio_test_private(src))
-		return -EBUSY;
+	if (folio_test_private(src)) {
+		if (mode == MIGRATE_SYNC)
+			nfs_wb_folio(src->mapping->host, src);
+		if (folio_test_private(src))
+			return -EBUSY;
+	}
 
 	if (folio_test_private_2(src)) { /* [DEPRECATED] */
 		if (mode == MIGRATE_ASYNC)