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authorTrond Myklebust <trondmy@gmail.com>2020-01-06 23:39:37 +0300
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2020-01-15 18:54:33 +0300
commitc74dfe97c104bda5144bfa8193d8e5ea67d5da7f (patch)
tree50a1d7f2e8791c3af949391359fb1279b1073244 /fs/nfs/nfs3proc.c
parent5c965db86e6b0e90a3112228820598e824920278 (diff)
downloadlinux-c74dfe97c104bda5144bfa8193d8e5ea67d5da7f.tar.xz
NFS: Add mount option 'softreval'
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>
Diffstat (limited to 'fs/nfs/nfs3proc.c')
-rw-r--r--fs/nfs/nfs3proc.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index 67a05f35bb89..19f3d1b2807e 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -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;
}