github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-24 07:03:03 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

NFS: Add a mount option to make ENETUNREACH errors fatal

Browse Source 
If the NFS client was initially created in a container, and that
container is torn down, there is usually no possibity to go back and
destroy any NFS clients that are hung because their virtual network
devices have been unlinked.

Add a flag that tells the NFS client that in these circumstances, it
should treat ENETDOWN and ENETUNREACH errors as fatal to the NFS client.

The option defaults to being on when the mount happens from inside a net
namespace that is not "init_net".

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Tested-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Trond Myklebust 2025-03-20 11:45:06 -04:00
parent 4c2226be81
commit 487fae09d7
3 changed files with 43 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
fs/nfs/fs_context.c
View File

@ -50,6 +50,7 @@ enum nfs_param {
Opt_clientaddr,
Opt_cto,
Opt_alignwrite,
Opt_fatal_neterrors,
Opt_fg,
Opt_fscache,
Opt_fscache_flag,
@ -97,6 +98,20 @@ enum nfs_param {
Opt_xprtsec,
};
enum {
Opt_fatal_neterrors_default,
Opt_fatal_neterrors_enetunreach,
Opt_fatal_neterrors_none,
};
static const struct constant_table nfs_param_enums_fatal_neterrors[] = {
{ "default", Opt_fatal_neterrors_default },
{ "ENETDOWN:ENETUNREACH", Opt_fatal_neterrors_enetunreach },
{ "ENETUNREACH:ENETDOWN", Opt_fatal_neterrors_enetunreach },
{ "none", Opt_fatal_neterrors_none },
{}
};
enum {
Opt_local_lock_all,
Opt_local_lock_flock,
@ -153,6 +168,8 @@ static const struct fs_parameter_spec nfs_fs_parameters[] = {
fsparam_string("clientaddr", Opt_clientaddr),
fsparam_flag_no("cto", Opt_cto),
fsparam_flag_no("alignwrite", Opt_alignwrite),
fsparam_enum("fatal_neterrors", Opt_fatal_neterrors,
nfs_param_enums_fatal_neterrors),
fsparam_flag ("fg", Opt_fg),
fsparam_flag_no("fsc", Opt_fscache_flag),
fsparam_string("fsc", Opt_fscache),
@ -896,6 +913,25 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
goto out_of_bounds;
ctx->nfs_server.max_connect = result.uint_32;
break;
case Opt_fatal_neterrors:
trace_nfs_mount_assign(param->key, param->string);
switch (result.uint_32) {
case Opt_fatal_neterrors_default:
if (fc->net_ns != &init_net)
ctx->flags |= NFS_MOUNT_NETUNREACH_FATAL;
else
ctx->flags &= ~NFS_MOUNT_NETUNREACH_FATAL;
break;
case Opt_fatal_neterrors_enetunreach:
ctx->flags |= NFS_MOUNT_NETUNREACH_FATAL;
break;
case Opt_fatal_neterrors_none:
ctx->flags &= ~NFS_MOUNT_NETUNREACH_FATAL;
break;
default:
goto out_invalid_value;
}
break;
case Opt_lookupcache:
trace_nfs_mount_assign(param->key, param->string);
switch (result.uint_32) {
@ -1675,6 +1711,9 @@ static int nfs_init_fs_context(struct fs_context *fc)
ctx->xprtsec.cert_serial = TLS_NO_CERT;
ctx->xprtsec.privkey_serial = TLS_NO_PRIVKEY;
if (fc->net_ns != &init_net)
ctx->flags |= NFS_MOUNT_NETUNREACH_FATAL;
fc->s_iflags |= SB_I_STABLE_WRITES;
}
fc->fs_private = ctx;

3
fs/nfs/super.c
View File

@ -457,6 +457,9 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
{ NFS_MOUNT_FORCE_RDIRPLUS, ",rdirplus=force", "" },
{ NFS_MOUNT_UNSHARED, ",nosharecache", "" },
{ NFS_MOUNT_NORESVPORT, ",noresvport", "" },
{ NFS_MOUNT_NETUNREACH_FATAL,
",fatal_neterrors=ENETDOWN:ENETUNREACH",
",fatal_neterrors=none" },
{ 0, NULL, NULL }
};
const struct proc_nfs_info *nfs_infop;

1
include/linux/nfs_fs_sb.h
View File

@ -168,6 +168,7 @@ struct nfs_server {
#define NFS_MOUNT_SHUTDOWN 0x08000000
#define NFS_MOUNT_NO_ALIGNWRITE 0x10000000
#define NFS_MOUNT_FORCE_RDIRPLUS 0x20000000
#define NFS_MOUNT_NETUNREACH_FATAL 0x40000000
unsigned int fattr_valid; /* Valid attributes */
unsigned int caps; /* server capabilities */