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nfsd4: do idr preallocation with stateid allocation
Move idr preallocation out of stateid initialization, into stateid allocation, so that we no longer have to handle any errors from the former. This is a little subtle due to the way the idr code manages these preallocated items--document that in comments. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields
parent
32513b40ef
commit
996e09385c
@ -215,13 +215,12 @@ static inline int get_new_stid(struct nfs4_stid *stid)
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int new_stid;
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int error;
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if (!idr_pre_get(stateids, GFP_KERNEL))
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return -ENOMEM;
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error = idr_get_new_above(stateids, stid, min_stateid, &new_stid);
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/*
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* All this code is currently serialized; the preallocation
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* above should still be ours:
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* Note: the necessary preallocation was done in
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* nfs4_alloc_stateid(). The idr code caps the number of
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* preallocations that can exist at a time, but the state lock
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* prevents anyone from using ours before we get here:
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*/
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BUG_ON(error);
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/*
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@ -240,7 +239,7 @@ static inline int get_new_stid(struct nfs4_stid *stid)
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return new_stid;
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}
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static inline __be32 init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, unsigned char type)
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static void init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, unsigned char type)
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{
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stateid_t *s = &stid->sc_stateid;
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int new_id;
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@ -249,12 +248,24 @@ static inline __be32 init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, u
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stid->sc_client = cl;
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s->si_opaque.so_clid = cl->cl_clientid;
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new_id = get_new_stid(stid);
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if (new_id < 0)
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return nfserr_jukebox;
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s->si_opaque.so_id = (u32)new_id;
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/* Will be incremented before return to client: */
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s->si_generation = 0;
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return 0;
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}
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static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab)
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{
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struct idr *stateids = &cl->cl_stateids;
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if (!idr_pre_get(stateids, GFP_KERNEL))
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return NULL;
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/*
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* Note: if we fail here (or any time between now and the time
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* we actually get the new idr), we won't need to undo the idr
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* preallocation, since the idr code caps the number of
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* preallocated entries.
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*/
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return kmem_cache_alloc(slab, GFP_KERNEL);
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}
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static struct nfs4_delegation *
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@ -262,7 +273,6 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct sv
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{
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struct nfs4_delegation *dp;
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struct nfs4_file *fp = stp->st_file;
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__be32 status;
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dprintk("NFSD alloc_init_deleg\n");
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/*
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@ -276,14 +286,10 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct sv
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return NULL;
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if (num_delegations > max_delegations)
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return NULL;
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dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
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dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
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if (dp == NULL)
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return dp;
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status = init_stid(&dp->dl_stid, clp, NFS4_DELEG_STID);
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if (status) {
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kmem_cache_free(deleg_slab, dp);
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return NULL;
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}
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init_stid(&dp->dl_stid, clp, NFS4_DELEG_STID);
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/*
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* delegation seqid's are never incremented. The 4.1 special
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* meaning of seqid 0 isn't meaningful, really, but let's avoid
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@ -2331,14 +2337,11 @@ alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, str
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return oo;
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}
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static inline __be32 init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
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static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
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struct nfs4_openowner *oo = open->op_openowner;
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struct nfs4_client *clp = oo->oo_owner.so_client;
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__be32 status;
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status = init_stid(&stp->st_stid, clp, NFS4_OPEN_STID);
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if (status)
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return status;
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init_stid(&stp->st_stid, clp, NFS4_OPEN_STID);
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INIT_LIST_HEAD(&stp->st_lockowners);
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list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
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list_add(&stp->st_perfile, &fp->fi_stateids);
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@ -2350,7 +2353,6 @@ static inline __be32 init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_
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__set_bit(open->op_share_access, &stp->st_access_bmap);
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__set_bit(open->op_share_deny, &stp->st_deny_bmap);
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stp->st_openstp = NULL;
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return nfs_ok;
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}
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static void
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@ -2614,10 +2616,14 @@ nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_st
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return nfs_ok;
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}
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static inline struct nfs4_ol_stateid *
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nfs4_alloc_stateid(void)
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static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
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{
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return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
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return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
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}
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static void nfs4_free_stateid(struct nfs4_ol_stateid *s)
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{
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kmem_cache_free(stateid_slab, s);
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}
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static inline int nfs4_access_to_access(u32 nfs4_access)
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@ -2661,15 +2667,16 @@ nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_ol_stateid **stpp,
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struct nfsd4_open *open)
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{
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struct nfs4_ol_stateid *stp;
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struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
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__be32 status;
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stp = nfs4_alloc_stateid();
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stp = nfs4_alloc_stateid(cl);
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if (stp == NULL)
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return nfserr_jukebox;
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status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
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if (status) {
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kmem_cache_free(stateid_slab, stp);
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nfs4_free_stateid(stp);
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return status;
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}
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*stpp = stp;
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@ -2912,11 +2919,7 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf
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status = nfs4_new_open(rqstp, &stp, fp, current_fh, open);
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if (status)
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goto out;
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status = init_open_stateid(stp, fp, open);
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if (status) {
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release_open_stateid(stp);
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goto out;
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}
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init_open_stateid(stp, fp, open);
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status = nfsd4_truncate(rqstp, current_fh, open);
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if (status) {
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release_open_stateid(stp);
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@ -3812,16 +3815,11 @@ alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct
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{
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struct nfs4_ol_stateid *stp;
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struct nfs4_client *clp = lo->lo_owner.so_client;
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__be32 status;
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stp = nfs4_alloc_stateid();
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stp = nfs4_alloc_stateid(clp);
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if (stp == NULL)
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return NULL;
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status = init_stid(&stp->st_stid, clp, NFS4_LOCK_STID);
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if (status) {
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free_generic_stateid(stp);
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return NULL;
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}
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init_stid(&stp->st_stid, clp, NFS4_LOCK_STID);
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list_add(&stp->st_perfile, &fp->fi_stateids);
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list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
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stp->st_stateowner = &lo->lo_owner;
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@ -85,6 +85,7 @@ struct nfs4_stid {
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};
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struct nfs4_delegation {
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struct nfs4_stid dl_stid; /* must be first field */
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struct list_head dl_perfile;
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struct list_head dl_perclnt;
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struct list_head dl_recall_lru; /* delegation recalled */
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@ -93,7 +94,6 @@ struct nfs4_delegation {
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u32 dl_type;
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time_t dl_time;
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/* For recall: */
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struct nfs4_stid dl_stid;
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struct knfsd_fh dl_fh;
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int dl_retries;
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struct nfsd4_callback dl_recall;
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@ -434,7 +434,7 @@ static inline struct file *find_any_file(struct nfs4_file *f)
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/* "ol" stands for "Open or Lock". Better suggestions welcome. */
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struct nfs4_ol_stateid {
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struct nfs4_stid st_stid;
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struct nfs4_stid st_stid; /* must be first field */
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struct list_head st_perfile;
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struct list_head st_perstateowner;
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struct list_head st_lockowners;
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