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NFS: Add mount option 'softreval'

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Add a mount option 'softreval' that allows attribute revalidation 'getattr'
calls to time out, and causes them to fall back to using the cached
attributes.
The use case for this option is for ensuring that we can still (slowly)
traverse paths and use cached information even when the server is down.
Once the server comes back up again, the getattr calls start succeeding,
and the caches will revalidate as usual.

The 'softreval' mount option is automatically enabled if you have
specified 'softerr'.  It can be turned off using the options
'nosoftreval', or 'hard'.

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 2020-01-06 15:39:37 -05:00 committed by Anna Schumaker
parent 5c965db86e
commit c74dfe97c1
7 changed files with 59 additions and 12 deletions
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14
fs/nfs/fs_context.c
View File

@ -73,6 +73,7 @@ enum nfs_param {
Opt_sloppy,
Opt_soft,
Opt_softerr,
Opt_softreval,
Opt_source,
Opt_tcp,
Opt_timeo,
@ -128,6 +129,7 @@ static const struct fs_parameter_spec nfs_param_specs[] = {
fsparam_flag ("sloppy", Opt_sloppy),
fsparam_flag ("soft", Opt_soft),
fsparam_flag ("softerr", Opt_softerr),
fsparam_flag ("softreval", Opt_softreval),
fsparam_string("source", Opt_source),
fsparam_flag ("tcp", Opt_tcp),
fsparam_u32 ("timeo", Opt_timeo),
@ -460,11 +462,19 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
ctx->flags &= ~NFS_MOUNT_SOFTERR;
break;
case Opt_softerr:
ctx->flags |= NFS_MOUNT_SOFTERR;
ctx->flags |= NFS_MOUNT_SOFTERR | NFS_MOUNT_SOFTREVAL;
ctx->flags &= ~NFS_MOUNT_SOFT;
break;
case Opt_hard:
ctx->flags &= ~(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR);
ctx->flags &= ~(NFS_MOUNT_SOFT |
NFS_MOUNT_SOFTERR |
NFS_MOUNT_SOFTREVAL);
break;
case Opt_softreval:
if (result.negated)
ctx->flags &= ~NFS_MOUNT_SOFTREVAL;
else
ctx->flags &= NFS_MOUNT_SOFTREVAL;
break;
case Opt_posix:
if (result.negated)

8
fs/nfs/inode.c
View File

@ -1156,7 +1156,13 @@ __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
inode->i_sb->s_id,
(unsigned long long)NFS_FILEID(inode), status);
if (status == -ESTALE) {
switch (status) {
case -ETIMEDOUT:
/* A soft timeout occurred. Use cached information? */
if (server->flags & NFS_MOUNT_SOFTREVAL)
status = 0;
break;
case -ESTALE:
nfs_zap_caches(inode);
if (!S_ISDIR(inode->i_mode))
set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);

7
fs/nfs/nfs3proc.c
View File

@ -110,10 +110,15 @@ nfs3_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
.rpc_resp = fattr,
};
int status;
unsigned short task_flags = 0;
/* Is this is an attribute revalidation, subject to softreval? */
if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
task_flags |= RPC_TASK_TIMEOUT;
dprintk("NFS call getattr\n");
nfs_fattr_init(fattr);
status = rpc_call_sync(server->client, &msg, 0);
status = rpc_call_sync(server->client, &msg, task_flags);
dprintk("NFS reply getattr: %d\n", status);
return status;
}

33
fs/nfs/nfs4proc.c
View File

@ -1097,11 +1097,12 @@ static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
return ret;
}
static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
struct nfs_server *server,
struct rpc_message *msg,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res)
static int nfs4_do_call_sync(struct rpc_clnt *clnt,
struct nfs_server *server,
struct rpc_message *msg,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res,
unsigned short task_flags)
{
struct nfs_client *clp = server->nfs_client;
struct nfs4_call_sync_data data = {
@ -1113,12 +1114,23 @@ static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
.rpc_client = clnt,
.rpc_message = msg,
.callback_ops = clp->cl_mvops->call_sync_ops,
.callback_data = &data
.callback_data = &data,
.flags = task_flags,
};
return nfs4_call_sync_custom(&task_setup);
}
static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
struct nfs_server *server,
struct rpc_message *msg,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res)
{
return nfs4_do_call_sync(clnt, server, msg, args, res, 0);
}
int nfs4_call_sync(struct rpc_clnt *clnt,
struct nfs_server *server,
struct rpc_message *msg,
@ -4064,11 +4076,18 @@ static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
.rpc_argp = &args,
.rpc_resp = &res,
};
unsigned short task_flags = 0;
/* Is this is an attribute revalidation, subject to softreval? */
if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
task_flags |= RPC_TASK_TIMEOUT;
nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode);
nfs_fattr_init(fattr);
return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
return nfs4_do_call_sync(server->client, server, &msg,
&args.seq_args, &res.seq_res, task_flags);
}
int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,

7
fs/nfs/proc.c
View File

@ -108,10 +108,15 @@ nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
.rpc_resp = fattr,
};
int status;
unsigned short task_flags = 0;
/* Is this is an attribute revalidation, subject to softreval? */
if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
task_flags |= RPC_TASK_TIMEOUT;
dprintk("NFS call getattr\n");
nfs_fattr_init(fattr);
status = rpc_call_sync(server->client, &msg, 0);
status = rpc_call_sync(server->client, &msg, task_flags);
dprintk("NFS reply getattr: %d\n", status);
return status;
}

1
fs/nfs/super.c
View File

@ -375,6 +375,7 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
} nfs_info[] = {
{ NFS_MOUNT_SOFT, ",soft", "" },
{ NFS_MOUNT_SOFTERR, ",softerr", "" },
{ NFS_MOUNT_SOFTREVAL, ",softreval", "" },
{ NFS_MOUNT_POSIX, ",posix", "" },
{ NFS_MOUNT_NOCTO, ",nocto", "" },
{ NFS_MOUNT_NOAC, ",noac", "" },

1
include/linux/nfs_fs_sb.h
View File

@ -152,6 +152,7 @@ struct nfs_server {
#define NFS_MOUNT_LOCAL_FLOCK 0x100000
#define NFS_MOUNT_LOCAL_FCNTL 0x200000
#define NFS_MOUNT_SOFTERR 0x400000
#define NFS_MOUNT_SOFTREVAL 0x800000
unsigned int caps; /* server capabilities */
unsigned int rsize; /* read size */