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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
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@@ -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)