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authorTrond Myklebust <trondmy@gmail.com>2019-09-02 20:02:55 +0300
committerJ. Bruce Fields <bfields@redhat.com>2019-09-10 16:23:41 +0300
commit5e113224c17e2fb156b785ddbbc48a0209fddb0c (patch)
treedd3f0e389afb149e37ab9a96306f4f8445398169 /fs/nfsd
parent2b86e3aaf993a3ea6c73dfcf86143061a40c62e6 (diff)
downloadlinux-5e113224c17e2fb156b785ddbbc48a0209fddb0c.tar.xz
nfsd: nfsd_file cache entries should be per net namespace
Ensure that we can safely clear out the file cache entries when the nfs server is shut down on a container. Otherwise, the file cache may end up pinning the mounts. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/export.c2
-rw-r--r--fs/nfsd/filecache.c33
-rw-r--r--fs/nfsd/filecache.h3
-rw-r--r--fs/nfsd/nfssvc.c1
4 files changed, 25 insertions, 14 deletions
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 052fac64b578..15422c951fd1 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -240,7 +240,7 @@ static void expkey_flush(void)
* destroyed while we're in the middle of flushing.
*/
mutex_lock(&nfsd_mutex);
- nfsd_file_cache_purge();
+ nfsd_file_cache_purge(current->nsproxy->net_ns);
mutex_unlock(&nfsd_mutex);
}
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 2e1a972231e5..da9e790a055e 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -16,6 +16,7 @@
#include "vfs.h"
#include "nfsd.h"
#include "nfsfh.h"
+#include "netns.h"
#include "filecache.h"
#include "trace.h"
@@ -167,7 +168,8 @@ nfsd_file_mark_find_or_create(struct nfsd_file *nf)
}
static struct nfsd_file *
-nfsd_file_alloc(struct inode *inode, unsigned int may, unsigned int hashval)
+nfsd_file_alloc(struct inode *inode, unsigned int may, unsigned int hashval,
+ struct net *net)
{
struct nfsd_file *nf;
@@ -177,6 +179,7 @@ nfsd_file_alloc(struct inode *inode, unsigned int may, unsigned int hashval)
INIT_LIST_HEAD(&nf->nf_lru);
nf->nf_file = NULL;
nf->nf_cred = get_current_cred();
+ nf->nf_net = net;
nf->nf_flags = 0;
nf->nf_inode = inode;
nf->nf_hashval = hashval;
@@ -607,10 +610,11 @@ out_err:
* Note this can deadlock with nfsd_file_lru_cb.
*/
void
-nfsd_file_cache_purge(void)
+nfsd_file_cache_purge(struct net *net)
{
unsigned int i;
struct nfsd_file *nf;
+ struct hlist_node *next;
LIST_HEAD(dispose);
bool del;
@@ -618,10 +622,12 @@ nfsd_file_cache_purge(void)
return;
for (i = 0; i < NFSD_FILE_HASH_SIZE; i++) {
- spin_lock(&nfsd_file_hashtbl[i].nfb_lock);
- while(!hlist_empty(&nfsd_file_hashtbl[i].nfb_head)) {
- nf = hlist_entry(nfsd_file_hashtbl[i].nfb_head.first,
- struct nfsd_file, nf_node);
+ struct nfsd_fcache_bucket *nfb = &nfsd_file_hashtbl[i];
+
+ spin_lock(&nfb->nfb_lock);
+ hlist_for_each_entry_safe(nf, next, &nfb->nfb_head, nf_node) {
+ if (net && nf->nf_net != net)
+ continue;
del = nfsd_file_unhash_and_release_locked(nf, &dispose);
/*
@@ -630,7 +636,7 @@ nfsd_file_cache_purge(void)
*/
WARN_ON_ONCE(!del);
}
- spin_unlock(&nfsd_file_hashtbl[i].nfb_lock);
+ spin_unlock(&nfb->nfb_lock);
nfsd_file_dispose_list(&dispose);
}
}
@@ -649,7 +655,7 @@ nfsd_file_cache_shutdown(void)
* calling nfsd_file_cache_purge
*/
cancel_delayed_work_sync(&nfsd_filecache_laundrette);
- nfsd_file_cache_purge();
+ nfsd_file_cache_purge(NULL);
list_lru_destroy(&nfsd_file_lru);
rcu_barrier();
fsnotify_put_group(nfsd_file_fsnotify_group);
@@ -685,7 +691,7 @@ nfsd_match_cred(const struct cred *c1, const struct cred *c2)
static struct nfsd_file *
nfsd_file_find_locked(struct inode *inode, unsigned int may_flags,
- unsigned int hashval)
+ unsigned int hashval, struct net *net)
{
struct nfsd_file *nf;
unsigned char need = may_flags & NFSD_FILE_MAY_MASK;
@@ -696,6 +702,8 @@ nfsd_file_find_locked(struct inode *inode, unsigned int may_flags,
continue;
if (nf->nf_inode != inode)
continue;
+ if (nf->nf_net != net)
+ continue;
if (!nfsd_match_cred(nf->nf_cred, current_cred()))
continue;
if (nfsd_file_get(nf) != NULL)
@@ -738,6 +746,7 @@ nfsd_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
unsigned int may_flags, struct nfsd_file **pnf)
{
__be32 status;
+ struct net *net = SVC_NET(rqstp);
struct nfsd_file *nf, *new;
struct inode *inode;
unsigned int hashval;
@@ -752,12 +761,12 @@ nfsd_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
hashval = (unsigned int)hash_long(inode->i_ino, NFSD_FILE_HASH_BITS);
retry:
rcu_read_lock();
- nf = nfsd_file_find_locked(inode, may_flags, hashval);
+ nf = nfsd_file_find_locked(inode, may_flags, hashval, net);
rcu_read_unlock();
if (nf)
goto wait_for_construction;
- new = nfsd_file_alloc(inode, may_flags, hashval);
+ new = nfsd_file_alloc(inode, may_flags, hashval, net);
if (!new) {
trace_nfsd_file_acquire(rqstp, hashval, inode, may_flags,
NULL, nfserr_jukebox);
@@ -765,7 +774,7 @@ retry:
}
spin_lock(&nfsd_file_hashtbl[hashval].nfb_lock);
- nf = nfsd_file_find_locked(inode, may_flags, hashval);
+ nf = nfsd_file_find_locked(inode, may_flags, hashval, net);
if (nf == NULL)
goto open_file;
spin_unlock(&nfsd_file_hashtbl[hashval].nfb_lock);
diff --git a/fs/nfsd/filecache.h b/fs/nfsd/filecache.h
index 0c0c67166b87..851d9abf54c2 100644
--- a/fs/nfsd/filecache.h
+++ b/fs/nfsd/filecache.h
@@ -34,6 +34,7 @@ struct nfsd_file {
struct rcu_head nf_rcu;
struct file *nf_file;
const struct cred *nf_cred;
+ struct net *nf_net;
#define NFSD_FILE_HASHED (0)
#define NFSD_FILE_PENDING (1)
#define NFSD_FILE_BREAK_READ (2)
@@ -48,7 +49,7 @@ struct nfsd_file {
};
int nfsd_file_cache_init(void);
-void nfsd_file_cache_purge(void);
+void nfsd_file_cache_purge(struct net *);
void nfsd_file_cache_shutdown(void);
void nfsd_file_put(struct nfsd_file *nf);
struct nfsd_file *nfsd_file_get(struct nfsd_file *nf);
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index d02712ca2685..b944553c6927 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -387,6 +387,7 @@ static void nfsd_shutdown_net(struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ nfsd_file_cache_purge(net);
nfs4_state_shutdown_net(net);
if (nn->lockd_up) {
lockd_down(net);