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knfsd: Allow lockless lookups of the exports

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Convert structs svc_expkey and svc_export to allow RCU protected lookups.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2018-10-01 10:41:47 -04:00 committed by J. Bruce Fields
parent fd5d2f7826
commit 9ceddd9da1
2 changed files with 9 additions and 7 deletions
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14
fs/nfsd/export.c
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@ -46,7 +46,7 @@ static void expkey_put(struct kref *ref)
!test_bit(CACHE_NEGATIVE, &key->h.flags))
path_put(&key->ek_path);
auth_domain_put(key->ek_client);
kfree(key);
kfree_rcu(key, ek_rcu);
}
static void expkey_request(struct cache_detail *cd,
@ -265,7 +265,7 @@ svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
struct cache_head *ch;
int hash = svc_expkey_hash(item);
ch = sunrpc_cache_lookup(cd, &item->h, hash);
ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
if (ch)
return container_of(ch, struct svc_expkey, h);
else
@ -314,7 +314,7 @@ static void svc_export_put(struct kref *ref)
auth_domain_put(exp->ex_client);
nfsd4_fslocs_free(&exp->ex_fslocs);
kfree(exp->ex_uuid);
kfree(exp);
kfree_rcu(exp, ex_rcu);
}
static void svc_export_request(struct cache_detail *cd,
@ -780,7 +780,7 @@ svc_export_lookup(struct svc_export *exp)
struct cache_head *ch;
int hash = svc_export_hash(exp);
ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
ch = sunrpc_cache_lookup_rcu(exp->cd, &exp->h, hash);
if (ch)
return container_of(ch, struct svc_export, h);
else
@ -1216,9 +1216,9 @@ static int e_show(struct seq_file *m, void *p)
}
const struct seq_operations nfs_exports_op = {
.start = cache_seq_start,
.next = cache_seq_next,
.stop = cache_seq_stop,
.start = cache_seq_start_rcu,
.next = cache_seq_next_rcu,
.stop = cache_seq_stop_rcu,
.show = e_show,
};

2
fs/nfsd/export.h
View File

@ -61,6 +61,7 @@ struct svc_export {
u32 ex_layout_types;
struct nfsd4_deviceid_map *ex_devid_map;
struct cache_detail *cd;
struct rcu_head ex_rcu;
};
/* an "export key" (expkey) maps a filehandlefragement to an
@ -75,6 +76,7 @@ struct svc_expkey {
u32 ek_fsid[6];
struct path ek_path;
struct rcu_head ek_rcu;
};
#define EX_ISSYNC(exp) (!((exp)->ex_flags & NFSEXP_ASYNC))