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NFSv4: More CLOSE/OPEN races

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If an OPEN RPC call races with a CLOSE or OPEN_DOWNGRADE so that it
updates the nfs_state structure before the CLOSE/OPEN_DOWNGRADE has
a chance to do so, then we know that the state->flags need to be
recalculated from scratch.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2015-01-23 18:06:09 -05:00
commit f95549cf24
1 changed files with 15 additions and 1 deletions
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16
fs/nfs/nfs4proc.c
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@ -1167,6 +1167,16 @@ static bool nfs_need_update_open_stateid(struct nfs4_state *state,
return false;
}
static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
{
if (state->n_wronly)
set_bit(NFS_O_WRONLY_STATE, &state->flags);
if (state->n_rdonly)
set_bit(NFS_O_RDONLY_STATE, &state->flags);
if (state->n_rdwr)
set_bit(NFS_O_RDWR_STATE, &state->flags);
}
static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
nfs4_stateid *stateid, fmode_t fmode)
{
@ -1185,8 +1195,12 @@ static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
}
if (stateid == NULL)
return;
if (!nfs_need_update_open_stateid(state, stateid))
/* Handle races with OPEN */
if (!nfs4_stateid_match_other(stateid, &state->open_stateid) ||
!nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
nfs_resync_open_stateid_locked(state);
return;
}
if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
nfs4_stateid_copy(&state->stateid, stateid);
nfs4_stateid_copy(&state->open_stateid, stateid);