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>
This commit is contained in:
Trond Myklebust 2013-03-15 16:44:28 -04:00
parent d9fc6619ca
commit 49f9a0fafd
3 changed files with 49 additions and 7 deletions

View File

@ -1486,6 +1486,8 @@ static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags)
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);

View File

@ -767,6 +767,35 @@ struct nfs4_opendata {
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 @@ static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
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 @@ static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state
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 @@ static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *s
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 @@ static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state
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 @@ static int _nfs4_do_open(struct inode *dir,
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 @@ static int _nfs4_do_open(struct inode *dir,
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 @@ static struct nfs4_state *nfs4_do_open(struct inode *dir,
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 @@ static struct nfs4_state *nfs4_do_open(struct inode *dir,
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 @@ static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
| 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,

View File

@ -198,5 +198,6 @@ struct nfs_server {
#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