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NFSv4: Handle NFS4ERR_OLD_STATEID in CLOSE/OPEN_DOWNGRADE 

If a CLOSE or OPEN_DOWNGRADE operation receives a NFS4ERR_OLD_STATEID
then bump the seqid before resending. Ensure we only bump the seqid
by 1.

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 2019-09-20 07:23:47 -04:00 committed by Anna Schumaker
parent e217e825dc
commit 0e0cb35b41
3 changed files with 72 additions and 21 deletions
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2
fs/nfs/nfs4_fs.h
View File

@ -491,8 +491,6 @@ extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
const struct nfs_lock_context *, nfs4_stateid *,
const struct cred **);
extern bool nfs4_refresh_open_stateid(nfs4_stateid *dst,
struct nfs4_state *state);
extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
struct nfs4_state *state);

75
fs/nfs/nfs4proc.c
View File

@ -3313,6 +3313,75 @@ nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
return pnfs_wait_on_layoutreturn(inode, task);
}
/*
* Update the seqid of an open stateid
*/
static void nfs4_sync_open_stateid(nfs4_stateid *dst,
struct nfs4_state *state)
{
__be32 seqid_open;
u32 dst_seqid;
int seq;
for (;;) {
if (!nfs4_valid_open_stateid(state))
break;
seq = read_seqbegin(&state->seqlock);
if (!nfs4_state_match_open_stateid_other(state, dst)) {
nfs4_stateid_copy(dst, &state->open_stateid);
if (read_seqretry(&state->seqlock, seq))
continue;
break;
}
seqid_open = state->open_stateid.seqid;
if (read_seqretry(&state->seqlock, seq))
continue;
dst_seqid = be32_to_cpu(dst->seqid);
if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
dst->seqid = seqid_open;
break;
}
}
/*
* Update the seqid of an open stateid after receiving
* NFS4ERR_OLD_STATEID
*/
static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
struct nfs4_state *state)
{
__be32 seqid_open;
u32 dst_seqid;
bool ret;
int seq;
for (;;) {
ret = false;
if (!nfs4_valid_open_stateid(state))
break;
seq = read_seqbegin(&state->seqlock);
if (!nfs4_state_match_open_stateid_other(state, dst)) {
if (read_seqretry(&state->seqlock, seq))
continue;
break;
}
seqid_open = state->open_stateid.seqid;
if (read_seqretry(&state->seqlock, seq))
continue;
dst_seqid = be32_to_cpu(dst->seqid);
if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) >= 0)
dst->seqid = cpu_to_be32(dst_seqid + 1);
else
dst->seqid = seqid_open;
ret = true;
break;
}
return ret;
}
struct nfs4_closedata {
struct inode *inode;
struct nfs4_state *state;
@ -3387,7 +3456,7 @@ static void nfs4_close_done(struct rpc_task *task, void *data)
break;
case -NFS4ERR_OLD_STATEID:
/* Did we race with OPEN? */
if (nfs4_refresh_open_stateid(&calldata->arg.stateid,
if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
state))
goto out_restart;
goto out_release;
@ -3456,8 +3525,8 @@ static void nfs4_close_prepare(struct rpc_task *task, void *data)
} else if (is_rdwr)
calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
if (!nfs4_valid_open_stateid(state) ||
!nfs4_refresh_open_stateid(&calldata->arg.stateid, state))
nfs4_sync_open_stateid(&calldata->arg.stateid, state);
if (!nfs4_valid_open_stateid(state))
call_close = 0;
spin_unlock(&state->owner->so_lock);

16
fs/nfs/nfs4state.c
View File

@ -1015,22 +1015,6 @@ out:
return ret;
}
bool nfs4_refresh_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
{
bool ret;
int seq;
do {
ret = false;
seq = read_seqbegin(&state->seqlock);
if (nfs4_state_match_open_stateid_other(state, dst)) {
dst->seqid = state->open_stateid.seqid;
ret = true;
}
} while (read_seqretry(&state->seqlock, seq));
return ret;
}
bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
{
bool ret;