diff options
Diffstat (limited to 'fs/nfsd/nfs4state.c')
| -rw-r--r-- | fs/nfsd/nfs4state.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index e98f3c2e949..55c36e267b7 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -60,9 +60,12 @@ static u64 current_sessionid = 1; /* forward declarations */ static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags); +static struct nfs4_stateid * search_for_stateid(stateid_t *stid); +static struct nfs4_delegation * search_for_delegation(stateid_t *stid); static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid); static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; static void nfs4_set_recdir(char *recdir); +static int check_for_locks(struct nfs4_file *filp, struct nfs4_stateowner *lowner); /* Locking: */ @@ -3137,6 +3140,11 @@ static int is_delegation_stateid(stateid_t *stateid) return stateid->si_fileid == 0; } +static int is_open_stateid(struct nfs4_stateid *stateid) +{ + return stateid->st_openstp == NULL; +} + /* * Checks for stateid operations */ @@ -3216,6 +3224,70 @@ out: return status; } +static __be32 +nfsd4_free_delegation_stateid(stateid_t *stateid) +{ + struct nfs4_delegation *dp = search_for_delegation(stateid); + if (dp) + return nfserr_locks_held; + return nfserr_bad_stateid; +} + +static __be32 +nfsd4_free_lock_stateid(struct nfs4_stateid *stp) +{ + if (check_for_locks(stp->st_file, stp->st_stateowner)) + return nfserr_locks_held; + release_lock_stateid(stp); + return nfs_ok; +} + +/* + * Free a state id + */ +__be32 +nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, + struct nfsd4_free_stateid *free_stateid) +{ + stateid_t *stateid = &free_stateid->fr_stateid; + struct nfs4_stateid *stp; + __be32 ret; + + nfs4_lock_state(); + if (is_delegation_stateid(stateid)) { + ret = nfsd4_free_delegation_stateid(stateid); + goto out; + } + + stp = search_for_stateid(stateid); + if (!stp) { + ret = nfserr_bad_stateid; + goto out; + } + if (stateid->si_generation != 0) { + if (stateid->si_generation < stp->st_stateid.si_generation) { + ret = nfserr_old_stateid; + goto out; + } + if (stateid->si_generation > stp->st_stateid.si_generation) { + ret = nfserr_bad_stateid; + goto out; + } + } + + if (is_open_stateid(stp)) { + ret = nfserr_locks_held; + goto out; + } else { + ret = nfsd4_free_lock_stateid(stp); + goto out; + } + +out: + nfs4_unlock_state(); + return ret; +} + static inline int setlkflg (int type) { @@ -3594,6 +3666,14 @@ static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE]; static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE]; static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE]; +static int +same_stateid(stateid_t *id_one, stateid_t *id_two) +{ + if (id_one->si_stateownerid != id_two->si_stateownerid) + return 0; + return id_one->si_fileid == id_two->si_fileid; +} + static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags) { @@ -3623,6 +3703,44 @@ find_stateid(stateid_t *stid, int flags) return NULL; } +static struct nfs4_stateid * +search_for_stateid(stateid_t *stid) +{ + struct nfs4_stateid *local; + unsigned int hashval = stateid_hashval(stid->si_stateownerid, stid->si_fileid); + + list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) { + if (same_stateid(&local->st_stateid, stid)) + return local; + } + + list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) { + if (same_stateid(&local->st_stateid, stid)) + return local; + } + return NULL; +} + +static struct nfs4_delegation * +search_for_delegation(stateid_t *stid) +{ + struct nfs4_file *fp; + struct nfs4_delegation *dp; + struct list_head *pos; + int i; + + for (i = 0; i < FILE_HASH_SIZE; i++) { + list_for_each_entry(fp, &file_hashtbl[i], fi_hash) { + list_for_each(pos, &fp->fi_delegations) { + dp = list_entry(pos, struct nfs4_delegation, dl_perfile); + if (same_stateid(&dp->dl_stateid, stid)) + return dp; + } + } + } + return NULL; +} + static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid) { |