[v3,18/29] NFS: Add a mount option "softerr" to allow clients to see ETIMEDOUT errors
diff mbox series

Message ID 20190407175912.23528-19-trond.myklebust@hammerspace.com
State New
Headers show
Series
  • Fix up soft mounts for NFSv4.x
Related show

Commit Message

Trond Myklebust April 7, 2019, 5:59 p.m. UTC
Add a mount option that exposes the ETIMEDOUT errors that occur during
soft timeouts to the application. This allows aware applications to
distinguish between server disk IO errors and client timeout errors.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 fs/nfs/client.c           |  2 ++
 fs/nfs/super.c            | 15 ++++++++++++---
 include/linux/nfs_fs_sb.h |  1 +
 3 files changed, 15 insertions(+), 3 deletions(-)

Patch
diff mbox series

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 90d71fda65ce..f74638c5e5b4 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -598,6 +598,8 @@  int nfs_init_server_rpcclient(struct nfs_server *server,
 			sizeof(server->client->cl_timeout_default));
 	server->client->cl_timeout = &server->client->cl_timeout_default;
 	server->client->cl_softrtry = 0;
+	if (server->flags & NFS_MOUNT_SOFTERR)
+		server->client->cl_softerr = 1;
 	if (server->flags & NFS_MOUNT_SOFT)
 		server->client->cl_softrtry = 1;
 
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 23790c7b2289..61cae26dbf78 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -78,7 +78,7 @@ 
 
 enum {
 	/* Mount options that take no arguments */
-	Opt_soft, Opt_hard,
+	Opt_soft, Opt_softerr, Opt_hard,
 	Opt_posix, Opt_noposix,
 	Opt_cto, Opt_nocto,
 	Opt_ac, Opt_noac,
@@ -125,6 +125,7 @@  static const match_table_t nfs_mount_option_tokens = {
 	{ Opt_sloppy, "sloppy" },
 
 	{ Opt_soft, "soft" },
+	{ Opt_softerr, "softerr" },
 	{ Opt_hard, "hard" },
 	{ Opt_deprecated, "intr" },
 	{ Opt_deprecated, "nointr" },
@@ -628,7 +629,8 @@  static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
 		const char *str;
 		const char *nostr;
 	} nfs_info[] = {
-		{ NFS_MOUNT_SOFT, ",soft", ",hard" },
+		{ NFS_MOUNT_SOFT, ",soft", "" },
+		{ NFS_MOUNT_SOFTERR, ",softerr", "" },
 		{ NFS_MOUNT_POSIX, ",posix", "" },
 		{ NFS_MOUNT_NOCTO, ",nocto", "" },
 		{ NFS_MOUNT_NOAC, ",noac", "" },
@@ -658,6 +660,8 @@  static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
 		seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
 	if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
 		seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
+	if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)))
+			seq_puts(m, ",hard");
 	for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
 		if (nfss->flags & nfs_infop->flag)
 			seq_puts(m, nfs_infop->str);
@@ -1239,10 +1243,15 @@  static int nfs_parse_mount_options(char *raw,
 		 */
 		case Opt_soft:
 			mnt->flags |= NFS_MOUNT_SOFT;
+			mnt->flags &= ~NFS_MOUNT_SOFTERR;
 			break;
-		case Opt_hard:
+		case Opt_softerr:
+			mnt->flags |= NFS_MOUNT_SOFTERR;
 			mnt->flags &= ~NFS_MOUNT_SOFT;
 			break;
+		case Opt_hard:
+			mnt->flags &= ~(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR);
+			break;
 		case Opt_posix:
 			mnt->flags |= NFS_MOUNT_POSIX;
 			break;
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 013ac5b54a09..0fbc5d3c5e53 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -147,6 +147,7 @@  struct nfs_server {
 #define NFS_MOUNT_LEGACY_INTERFACE	0x80000
 #define NFS_MOUNT_LOCAL_FLOCK		0x100000
 #define NFS_MOUNT_LOCAL_FCNTL		0x200000
+#define NFS_MOUNT_SOFTERR		0x400000
 
 	unsigned int		caps;		/* server capabilities */
 	unsigned int		rsize;		/* read size */