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nfsd: Make init_open_stateid() a bit more whole 

Move the state selection logic inside from the caller,
always making it return correct stp to use.

Signed-off-by: J . Bruce Fields <bfields@fieldses.org>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Oleg Drokin 2016-06-14 23:28:06 -04:00 коммит произвёл J. Bruce Fields
Родитель 5cc1fb2a09
Коммит 8c7245abda
1 изменённых файлов: 12 добавлений и 15 удалений
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27
fs/nfsd/nfs4state.c
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@ -3480,13 +3480,14 @@ alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
}
static struct nfs4_ol_stateid *
init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp,
struct nfsd4_open *open)
init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
{
struct nfs4_openowner *oo = open->op_openowner;
struct nfs4_ol_stateid *retstp = NULL;
struct nfs4_ol_stateid *stp;
stp = open->op_stp;
/* We are moving these outside of the spinlocks to avoid the warnings */
mutex_init(&stp->st_mutex);
mutex_lock(&stp->st_mutex);
@ -3497,6 +3498,8 @@ init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp,
retstp = nfsd4_find_existing_open(fp, open);
if (retstp)
goto out_unlock;
open->op_stp = NULL;
atomic_inc(&stp->st_stid.sc_count);
stp->st_stid.sc_type = NFS4_OPEN_STID;
INIT_LIST_HEAD(&stp->st_locks);
@ -3514,10 +3517,11 @@ out_unlock:
spin_unlock(&oo->oo_owner.so_client->cl_lock);
if (retstp) {
mutex_lock(&retstp->st_mutex);
/* Not that we need to, just for neatness */
/* To keep mutex tracking happy */
mutex_unlock(&stp->st_mutex);
stp = retstp;
}
return retstp;
return stp;
}
/*
@ -4313,7 +4317,6 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf
struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
struct nfs4_file *fp = NULL;
struct nfs4_ol_stateid *stp = NULL;
struct nfs4_ol_stateid *swapstp = NULL;
struct nfs4_delegation *dp = NULL;
__be32 status;
@ -4350,16 +4353,10 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf
goto out;
}
} else {
stp = open->op_stp;
open->op_stp = NULL;
/*
* init_open_stateid() either returns a locked stateid
* it found, or initializes and locks the new one we passed in
*/
swapstp = init_open_stateid(stp, fp, open);
if (swapstp) {
nfs4_put_stid(&stp->st_stid);
stp = swapstp;
/* stp is returned locked. */
stp = init_open_stateid(fp, open);
/* See if we lost the race to some other thread */
if (stp->st_access_bmap != 0) {
status = nfs4_upgrade_open(rqstp, fp, current_fh,
stp, open);
if (status) {