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authorTrond Myklebust <trondmy@gmail.com>2019-04-07 13:59:01 -0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2019-04-25 14:18:14 -0400
commit91a575e1a98451d12df713f267a9a210a9e5dcf9 (patch)
tree89a147e126c5ab04a22041e20fcae2c670e5ec9e /fs/nfs
parent7b1355b615c67e8fcbfb508e6baee83aed9dee96 (diff)
downloadlinux-91a575e1a98451d12df713f267a9a210a9e5dcf9.tar.bz2
NFS: Add a mount option "softerr" to allow clients to see ETIMEDOUT errors
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> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/client.c2
-rw-r--r--fs/nfs/super.c15
2 files changed, 14 insertions, 3 deletions
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 c27ac96a95bd..19783e8ba9fb 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;