NFSv4.1: Enable open-by-filehandle
Sometimes, we actually _want_ to do open-by-filehandle, for instance
when recovering opens after a network partition, or when called
from nfs4_file_open.
Enable that functionality using a new capability NFS_CAP_ATOMIC_OPEN_V1,
and which is only enabled for NFSv4.1 servers that support it.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index f23f455..e093e73 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1486,6 +1486,8 @@
goto no_open;
if (d_mountpoint(dentry))
goto no_open;
+ if (NFS_SB(dentry->d_sb)->caps & NFS_CAP_ATOMIC_OPEN_V1)
+ goto no_open;
inode = dentry->d_inode;
parent = dget_parent(dentry);
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 7bbb06f..732b76f 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -767,6 +767,35 @@
int cancelled;
};
+static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
+ int err, struct nfs4_exception *exception)
+{
+ if (err != -EINVAL)
+ return false;
+ if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
+ return false;
+ server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
+ exception->retry = 1;
+ return true;
+}
+
+static enum open_claim_type4
+nfs4_map_atomic_open_claim(struct nfs_server *server,
+ enum open_claim_type4 claim)
+{
+ if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
+ return claim;
+ switch (claim) {
+ default:
+ return claim;
+ case NFS4_OPEN_CLAIM_FH:
+ return NFS4_OPEN_CLAIM_NULL;
+ case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
+ return NFS4_OPEN_CLAIM_DELEGATE_CUR;
+ case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
+ return NFS4_OPEN_CLAIM_DELEGATE_PREV;
+ }
+}
static void nfs4_init_opendata_res(struct nfs4_opendata *p)
{
@@ -818,8 +847,8 @@
p->o_arg.server = server;
p->o_arg.bitmask = server->attr_bitmask;
p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
- p->o_arg.claim = claim;
- switch (claim) {
+ p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
+ switch (p->o_arg.claim) {
case NFS4_OPEN_CLAIM_NULL:
case NFS4_OPEN_CLAIM_DELEGATE_CUR:
case NFS4_OPEN_CLAIM_DELEGATE_PREV:
@@ -1326,6 +1355,8 @@
int err;
do {
err = _nfs4_do_open_reclaim(ctx, state);
+ if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
+ continue;
if (err != -NFS4ERR_DELAY)
break;
nfs4_handle_exception(server, err, &exception);
@@ -1741,7 +1772,7 @@
int ret;
opendata = nfs4_open_recoverdata_alloc(ctx, state,
- NFS4_OPEN_CLAIM_NULL);
+ NFS4_OPEN_CLAIM_FH);
if (IS_ERR(opendata))
return PTR_ERR(opendata);
ret = nfs4_open_recover(opendata, state);
@@ -1759,6 +1790,8 @@
do {
err = _nfs4_open_expired(ctx, state);
+ if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
+ continue;
switch (err) {
default:
goto out;
@@ -1926,6 +1959,7 @@
struct nfs4_state *state = NULL;
struct nfs_server *server = NFS_SERVER(dir);
struct nfs4_opendata *opendata;
+ enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
int status;
/* Protect against reboot recovery conflicts */
@@ -1941,9 +1975,10 @@
if (dentry->d_inode != NULL)
nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
status = -ENOMEM;
+ if (dentry->d_inode)
+ claim = NFS4_OPEN_CLAIM_FH;
opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
- NFS4_OPEN_CLAIM_NULL,
- GFP_KERNEL);
+ claim, GFP_KERNEL);
if (opendata == NULL)
goto err_put_state_owner;
@@ -2001,6 +2036,7 @@
struct rpc_cred *cred,
struct nfs4_threshold **ctx_th)
{
+ struct nfs_server *server = NFS_SERVER(dir);
struct nfs4_exception exception = { };
struct nfs4_state *res;
int status;
@@ -2044,7 +2080,9 @@
exception.retry = 1;
continue;
}
- res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
+ if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
+ continue;
+ res = ERR_PTR(nfs4_handle_exception(server,
status, &exception));
} while (exception.retry);
return res;
@@ -6858,7 +6896,8 @@
| NFS_CAP_ATOMIC_OPEN
| NFS_CAP_CHANGE_ATTR
| NFS_CAP_POSIX_LOCK
- | NFS_CAP_STATEID_NFSV41,
+ | NFS_CAP_STATEID_NFSV41
+ | NFS_CAP_ATOMIC_OPEN_V1,
.call_sync = nfs4_call_sync_sequence,
.match_stateid = nfs41_match_stateid,
.find_root_sec = nfs41_find_root_sec,
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 74c9e52..d8fdfdc 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -198,5 +198,6 @@
#define NFS_CAP_POSIX_LOCK (1U << 14)
#define NFS_CAP_UIDGID_NOMAP (1U << 15)
#define NFS_CAP_STATEID_NFSV41 (1U << 16)
+#define NFS_CAP_ATOMIC_OPEN_V1 (1U << 17)
#endif