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NFS: Add a mount option "softerr" to allow clients to see ETIMEDOUT errors

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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>
This commit is contained in:
Trond Myklebust 2019-04-07 13:59:01 -04:00 committed by Anna Schumaker
parent 7b1355b615
commit 91a575e1a9
3 changed files with 15 additions and 3 deletions
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2
fs/nfs/client.c
View File

@ -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;

15
fs/nfs/super.c
View File

@ -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);
@ -1239,9 +1243,14 @@ static int nfs_parse_mount_options(char *raw,
*/
case Opt_soft:
mnt->flags |= NFS_MOUNT_SOFT;
mnt->flags &= ~NFS_MOUNT_SOFTERR;
break;
case Opt_softerr:
mnt->flags |= NFS_MOUNT_SOFTERR;
mnt->flags &= ~NFS_MOUNT_SOFT;
break;
case Opt_hard:
mnt->flags &= ~NFS_MOUNT_SOFT;
mnt->flags &= ~(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR);
break;
case Opt_posix:
mnt->flags |= NFS_MOUNT_POSIX;

1
include/linux/nfs_fs_sb.h
View File

@ -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 */