From 37c593c57324740821766c56e48cf09776a68a9c Mon Sep 17 00:00:00 2001 From: Tigran Mkrtchyan Date: Mon, 13 Feb 2012 22:55:32 +0100 Subject: [PATCH] nfsd41: use current stateid by value Signed-off-by: Tigran Mkrtchyan Signed-off-by: J. Bruce Fields --- fs/nfsd/current_stateid.h | 1 + fs/nfsd/nfs4proc.c | 12 +++++++++--- fs/nfsd/nfs4state.c | 16 ++++++++++++---- fs/nfsd/xdr4.h | 13 +++++++++++-- 4 files changed, 33 insertions(+), 9 deletions(-) diff --git a/fs/nfsd/current_stateid.h b/fs/nfsd/current_stateid.h index d8c9992..4123551 100644 --- a/fs/nfsd/current_stateid.h +++ b/fs/nfsd/current_stateid.h @@ -4,6 +4,7 @@ #include "state.h" #include "xdr4.h" +extern void clear_current_stateid(struct nfsd4_compound_state *cstate); /* * functions to set current state id */ diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index 1ee0e7c..53636ff 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -453,7 +453,10 @@ nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, return nfserr_restorefh; fh_dup2(&cstate->current_fh, &cstate->save_fh); - cstate->current_stateid = cstate->save_stateid; + if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) { + memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t)); + SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG); + } return nfs_ok; } @@ -465,7 +468,10 @@ nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, return nfserr_nofilehandle; fh_dup2(&cstate->save_fh, &cstate->current_fh); - cstate->save_stateid = cstate->current_stateid; + if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) { + memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t)); + SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG); + } return nfs_ok; } @@ -1238,7 +1244,7 @@ nfsd4_proc_compound(struct svc_rqst *rqstp, opdesc->op_set_currentstateid(cstate, &op->u); if (opdesc->op_flags & OP_CLEAR_STATEID) - cstate->current_stateid = NULL; + clear_current_stateid(cstate); if (need_wrongsec_check(rqstp)) op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp); diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 7b0b6f0..cf62079 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -4699,15 +4699,23 @@ nfs4_state_shutdown(void) static void get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid) { - if (cstate->current_stateid && CURRENT_STATEID(stateid)) - memcpy(stateid, cstate->current_stateid, sizeof(stateid_t)); + if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid)) + memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t)); } static void put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid) { - if (cstate->minorversion) - cstate->current_stateid = stateid; + if (cstate->minorversion) { + memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t)); + SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG); + } +} + +void +clear_current_stateid(struct nfsd4_compound_state *cstate) +{ + CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG); } /* diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h index 3c1ddd7..12789eb 100644 --- a/fs/nfsd/xdr4.h +++ b/fs/nfsd/xdr4.h @@ -43,6 +43,13 @@ #define NFSD4_MAX_TAGLEN 128 #define XDR_LEN(n) (((n) + 3) & ~3) +#define CURRENT_STATE_ID_FLAG (1<<0) +#define SAVED_STATE_ID_FLAG (1<<1) + +#define SET_STATE_ID(c, f) ((c)->sid_flags |= (f)) +#define HAS_STATE_ID(c, f) ((c)->sid_flags & (f)) +#define CLEAR_STATE_ID(c, f) ((c)->sid_flags &= ~(f)) + struct nfsd4_compound_state { struct svc_fh current_fh; struct svc_fh save_fh; @@ -54,8 +61,10 @@ struct nfsd4_compound_state { size_t iovlen; u32 minorversion; u32 status; - const stateid_t *current_stateid; - const stateid_t *save_stateid; + stateid_t current_stateid; + stateid_t save_stateid; + /* to indicate current and saved state id presents */ + u32 sid_flags; }; static inline bool nfsd4_has_session(struct nfsd4_compound_state *cs) -- 2.7.4