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NFSv4: Retrieve ACCESS on open if we're not using NFS4_CREATE_EXCLUSIVE 

NFS4_CREATE_EXCLUSIVE does not allow the caller to set an access mode,
so for most Linux filesystems, the access call ends up returning no
permissions. However both NFS4_CREATE_EXCLUSIVE4_1 and
NFS4_CREATE_GUARDED allow the client to set the access mode.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2021-07-14 13:00:58 -04:00
parent 43d20e80e2
commit a1e7f30a86
1 changed files with 22 additions and 23 deletions
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45
fs/nfs/nfs4proc.c
View File

@ -1388,27 +1388,22 @@ static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
sizeof(p->o_arg.u.verifier.data));
}
}
/* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
* will return permission denied for all bits until close */
if (!(flags & O_EXCL)) {
/* ask server to check for all possible rights as results
* are cached */
switch (p->o_arg.claim) {
default:
break;
case NFS4_OPEN_CLAIM_NULL:
case NFS4_OPEN_CLAIM_FH:
p->o_arg.access = NFS4_ACCESS_READ |
NFS4_ACCESS_MODIFY |
NFS4_ACCESS_EXTEND |
NFS4_ACCESS_EXECUTE;
/* ask server to check for all possible rights as results
* are cached */
switch (p->o_arg.claim) {
default:
break;
case NFS4_OPEN_CLAIM_NULL:
case NFS4_OPEN_CLAIM_FH:
p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
NFS4_ACCESS_EXECUTE;
#ifdef CONFIG_NFS_V4_2
if (server->caps & NFS_CAP_XATTR)
p->o_arg.access |= NFS4_ACCESS_XAREAD |
NFS4_ACCESS_XAWRITE |
NFS4_ACCESS_XALIST;
if (!(server->caps & NFS_CAP_XATTR))
break;
p->o_arg.access |= NFS4_ACCESS_XAREAD | NFS4_ACCESS_XAWRITE |
NFS4_ACCESS_XALIST;
#endif
}
}
p->o_arg.clientid = server->nfs_client->cl_clientid;
p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
@ -2472,11 +2467,15 @@ static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
/* Set the create mode (note dependency on the session type) */
data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
if (data->o_arg.open_flags & O_EXCL) {
data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
if (nfs4_has_persistent_session(clp))
data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
if (clp->cl_mvops->minor_version == 0) {
data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
/* don't put an ACCESS op in OPEN compound if O_EXCL,
* because ACCESS will return permission denied for
* all bits until close */
data->o_res.access_request = data->o_arg.access = 0;
} else if (nfs4_has_persistent_session(clp))
data->o_arg.createmode = NFS4_CREATE_GUARDED;
else if (clp->cl_mvops->minor_version > 0)
data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
}
return;
unlock_no_action: