From 61f8603d93fa0b0e2f73be7a4f048696417a24a3 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Wed, 3 Feb 2010 17:31:31 +1100
Subject: nfsd: factor out hash functions for export caches.
Both the _lookup and the _update functions for these two caches
independently calculate the hash of the key.
So factor out that code for improved reuse.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
---
fs/nfsd/export.c | 40 +++++++++++++++++++++++-----------------
1 file changed, 23 insertions(+), 17 deletions(-)
(limited to 'fs/nfsd/export.c')
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index a0c4016413f1..65ddc5b8eb33 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -258,10 +258,9 @@ static struct cache_detail svc_expkey_cache = {
.alloc = expkey_alloc,
};
-static struct svc_expkey *
-svc_expkey_lookup(struct svc_expkey *item)
+static int
+svc_expkey_hash(struct svc_expkey *item)
{
- struct cache_head *ch;
int hash = item->ek_fsidtype;
char * cp = (char*)item->ek_fsid;
int len = key_len(item->ek_fsidtype);
@@ -269,6 +268,14 @@ svc_expkey_lookup(struct svc_expkey *item)
hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
hash &= EXPKEY_HASHMASK;
+ return hash;
+}
+
+static struct svc_expkey *
+svc_expkey_lookup(struct svc_expkey *item)
+{
+ struct cache_head *ch;
+ int hash = svc_expkey_hash(item);
ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
hash);
@@ -282,13 +289,7 @@ static struct svc_expkey *
svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
{
struct cache_head *ch;
- int hash = new->ek_fsidtype;
- char * cp = (char*)new->ek_fsid;
- int len = key_len(new->ek_fsidtype);
-
- hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
- hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
- hash &= EXPKEY_HASHMASK;
+ int hash = svc_expkey_hash(new);
ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
&old->h, hash);
@@ -737,14 +738,22 @@ struct cache_detail svc_export_cache = {
.alloc = svc_export_alloc,
};
-static struct svc_export *
-svc_export_lookup(struct svc_export *exp)
+static int
+svc_export_hash(struct svc_export *exp)
{
- struct cache_head *ch;
int hash;
+
hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
+ return hash;
+}
+
+static struct svc_export *
+svc_export_lookup(struct svc_export *exp)
+{
+ struct cache_head *ch;
+ int hash = svc_export_hash(exp);
ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
hash);
@@ -758,10 +767,7 @@ static struct svc_export *
svc_export_update(struct svc_export *new, struct svc_export *old)
{
struct cache_head *ch;
- int hash;
- hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
- hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
- hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
+ int hash = svc_export_hash(old);
ch = sunrpc_cache_update(&svc_export_cache, &new->h,
&old->h,
--
cgit v1.2.1
From d03859a4aca3969efd91dc77be7efa2ae45b05d8 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <error27@gmail.com>
Date: Thu, 22 Apr 2010 11:30:59 +0200
Subject: nfsd: potential ERR_PTR dereference on exp_export() error paths.
We "goto finish" from several places where "exp" is an ERR_PTR. Also I
changed the check for "fsid_key" so that it was consistent with the check
I added.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
---
fs/nfsd/export.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
(limited to 'fs/nfsd/export.c')
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 65ddc5b8eb33..55da4d339293 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -1076,9 +1076,9 @@ exp_export(struct nfsctl_export *nxp)
err = 0;
finish:
kfree(new.ex_pathname);
- if (exp)
+ if (!IS_ERR_OR_NULL(exp))
exp_put(exp);
- if (fsid_key && !IS_ERR(fsid_key))
+ if (!IS_ERR_OR_NULL(fsid_key))
cache_put(&fsid_key->h, &svc_expkey_cache);
path_put(&path);
out_put_clp:
--
cgit v1.2.1