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NFS: Add softreval behaviour to nfs_lookup_revalidate()

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If the server is unavaliable, we want to allow the revalidating
lookup to time out, and to default to validating the cached dentry
if the 'softreval' mount option is set.

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
2020-01-14 12:06:34 -05:00
committed by Anna Schumaker
parent fe1e8dbec1
commit f7b37b8b13
9 changed files with 66 additions and 31 deletions
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15
fs/nfs/proc.c
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@@ -152,14 +152,14 @@ nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
}
static int
nfs_proc_lookup(struct inode *dir, const struct qstr *name,
nfs_proc_lookup(struct inode *dir, struct dentry *dentry,
struct nfs_fh *fhandle, struct nfs_fattr *fattr,
struct nfs4_label *label)
{
struct nfs_diropargs arg = {
.fh = NFS_FH(dir),
.name = name->name,
.len = name->len
.name = dentry->d_name.name,
.len = dentry->d_name.len
};
struct nfs_diropok res = {
.fh = fhandle,
@@ -171,10 +171,15 @@ nfs_proc_lookup(struct inode *dir, const struct qstr *name,
.rpc_resp = &res,
};
int status;
unsigned short task_flags = 0;
dprintk("NFS call lookup %s\n", name->name);
/* Is this is an attribute revalidation, subject to softreval? */
if (nfs_lookup_is_soft_revalidate(dentry))
task_flags |= RPC_TASK_TIMEOUT;
dprintk("NFS call lookup %pd2\n", dentry);
nfs_fattr_init(fattr);
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
dprintk("NFS reply lookup: %d\n", status);
return status;
}