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nfsd4: do idr preallocation with stateid allocation

Browse source 
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 2011-10-17 11:14:48 -04:00
parent 32513b40ef
commit 996e09385c
2 changed files with 39 additions and 41 deletions
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76
fs/nfsd/nfs4state.c
View file

@ -215,13 +215,12 @@ static inline int get_new_stid(struct nfs4_stid *stid)
int new_stid;
int error;
if (!idr_pre_get(stateids, GFP_KERNEL))
return -ENOMEM;
error = idr_get_new_above(stateids, stid, min_stateid, &new_stid);
/*
* All this code is currently serialized; the preallocation
* above should still be ours:
* Note: the necessary preallocation was done in
* nfs4_alloc_stateid(). The idr code caps the number of
* preallocations that can exist at a time, but the state lock
* prevents anyone from using ours before we get here:
*/
BUG_ON(error);
/*
@ -240,7 +239,7 @@ static inline int get_new_stid(struct nfs4_stid *stid)
return new_stid;
}
static inline __be32 init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, unsigned char type)
static void init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, unsigned char type)
{
stateid_t *s = &stid->sc_stateid;
int new_id;
@ -249,12 +248,24 @@ static inline __be32 init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, u
stid->sc_client = cl;
s->si_opaque.so_clid = cl->cl_clientid;
new_id = get_new_stid(stid);
if (new_id < 0)
return nfserr_jukebox;
s->si_opaque.so_id = (u32)new_id;
/* Will be incremented before return to client: */
s->si_generation = 0;
return 0;
}
static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab)
{
struct idr *stateids = &cl->cl_stateids;
if (!idr_pre_get(stateids, GFP_KERNEL))
return NULL;
/*
* Note: if we fail here (or any time between now and the time
* we actually get the new idr), we won't need to undo the idr
* preallocation, since the idr code caps the number of
* preallocated entries.
*/
return kmem_cache_alloc(slab, GFP_KERNEL);
}
static struct nfs4_delegation *
@ -262,7 +273,6 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct sv
{
struct nfs4_delegation *dp;
struct nfs4_file *fp = stp->st_file;
__be32 status;
dprintk("NFSD alloc_init_deleg\n");
/*
@ -276,14 +286,10 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct sv
return NULL;
if (num_delegations > max_delegations)
return NULL;
dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
if (dp == NULL)
return dp;
status = init_stid(&dp->dl_stid, clp, NFS4_DELEG_STID);
if (status) {
kmem_cache_free(deleg_slab, dp);
return NULL;
}
init_stid(&dp->dl_stid, clp, NFS4_DELEG_STID);
/*
* delegation seqid's are never incremented. The 4.1 special
* meaning of seqid 0 isn't meaningful, really, but let's avoid
@ -2331,14 +2337,11 @@ alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, str
return oo;
}
static inline __be32 init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
struct nfs4_openowner *oo = open->op_openowner;
struct nfs4_client *clp = oo->oo_owner.so_client;
__be32 status;
status = init_stid(&stp->st_stid, clp, NFS4_OPEN_STID);
if (status)
return status;
init_stid(&stp->st_stid, clp, NFS4_OPEN_STID);
INIT_LIST_HEAD(&stp->st_lockowners);
list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
list_add(&stp->st_perfile, &fp->fi_stateids);
@ -2350,7 +2353,6 @@ static inline __be32 init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_
__set_bit(open->op_share_access, &stp->st_access_bmap);
__set_bit(open->op_share_deny, &stp->st_deny_bmap);
stp->st_openstp = NULL;
return nfs_ok;
}
static void
@ -2614,10 +2616,14 @@ nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_st
return nfs_ok;
}
static inline struct nfs4_ol_stateid *
nfs4_alloc_stateid(void)
static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
{
return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
}
static void nfs4_free_stateid(struct nfs4_ol_stateid *s)
{
kmem_cache_free(stateid_slab, s);
}
static inline int nfs4_access_to_access(u32 nfs4_access)
@ -2661,15 +2667,16 @@ nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_ol_stateid **stpp,
struct nfsd4_open *open)
{
struct nfs4_ol_stateid *stp;
struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
__be32 status;
stp = nfs4_alloc_stateid();
stp = nfs4_alloc_stateid(cl);
if (stp == NULL)
return nfserr_jukebox;
status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
if (status) {
kmem_cache_free(stateid_slab, stp);
nfs4_free_stateid(stp);
return status;
}
*stpp = stp;
@ -2912,11 +2919,7 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf
status = nfs4_new_open(rqstp, &stp, fp, current_fh, open);
if (status)
goto out;
status = init_open_stateid(stp, fp, open);
if (status) {
release_open_stateid(stp);
goto out;
}
init_open_stateid(stp, fp, open);
status = nfsd4_truncate(rqstp, current_fh, open);
if (status) {
release_open_stateid(stp);
@ -3812,16 +3815,11 @@ alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct
{
struct nfs4_ol_stateid *stp;
struct nfs4_client *clp = lo->lo_owner.so_client;
__be32 status;
stp = nfs4_alloc_stateid();
stp = nfs4_alloc_stateid(clp);
if (stp == NULL)
return NULL;
status = init_stid(&stp->st_stid, clp, NFS4_LOCK_STID);
if (status) {
free_generic_stateid(stp);
return NULL;
}
init_stid(&stp->st_stid, clp, NFS4_LOCK_STID);
list_add(&stp->st_perfile, &fp->fi_stateids);
list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
stp->st_stateowner = &lo->lo_owner;

4
fs/nfsd/state.h
View file

@ -85,6 +85,7 @@ struct nfs4_stid {
};
struct nfs4_delegation {
struct nfs4_stid dl_stid; /* must be first field */
struct list_head dl_perfile;
struct list_head dl_perclnt;
struct list_head dl_recall_lru; /* delegation recalled */
@ -93,7 +94,6 @@ struct nfs4_delegation {
u32 dl_type;
time_t dl_time;
/* For recall: */
struct nfs4_stid dl_stid;
struct knfsd_fh dl_fh;
int dl_retries;
struct nfsd4_callback dl_recall;
@ -434,7 +434,7 @@ static inline struct file *find_any_file(struct nfs4_file *f)
/* "ol" stands for "Open or Lock". Better suggestions welcome. */
struct nfs4_ol_stateid {
struct nfs4_stid st_stid;
struct nfs4_stid st_stid; /* must be first field */
struct list_head st_perfile;
struct list_head st_perstateowner;
struct list_head st_lockowners;