NFSD: Forget state for a specific client

Write the client's ip address to any state file and all appropriate
state for that client will be forgotten.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/fault_inject.c b/fs/nfsd/fault_inject.c
index 19f9094..96ffdf5 100644 (file)
--- a/fs/nfsd/fault_inject.c
+++ b/fs/nfsd/fault_inject.c
@@ -8,9 +8,12 @@
 #include <linux/fs.h>
 #include <linux/debugfs.h>
 #include <linux/module.h>
+#include <linux/nsproxy.h>
+#include <linux/sunrpc/clnt.h>
 #include <asm/uaccess.h>
 
 #include "state.h"
+#include "netns.h"
 
 struct nfsd_fault_inject_op {
        char *file;
@@ -64,6 +67,24 @@ static void nfsd_inject_set(struct nfsd_fault_inject_op *op, u64 val)
        printk(KERN_INFO "NFSD: %s: found %llu", op->file, count);
 }
 
+static void nfsd_inject_set_client(struct nfsd_fault_inject_op *op,
+                                  struct sockaddr_storage *addr,
+                                  size_t addr_size)
+{
+       char buf[INET6_ADDRSTRLEN];
+       struct nfs4_client *clp;
+       u64 count;
+
+       nfs4_lock_state();
+       clp = nfsd_find_client(addr, addr_size);
+       if (clp) {
+               count = op->forget(clp, 0);
+               rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, 129);
+               printk(KERN_INFO "NFSD [%s]: Client %s had %llu state object(s)\n", op->file, buf, count);
+       }
+       nfs4_unlock_state();
+}
+
 static void nfsd_inject_get(struct nfsd_fault_inject_op *op, u64 *val)
 {
        nfs4_lock_state();
@@ -100,15 +121,23 @@ static ssize_t fault_inject_read(struct file *file, char __user *buf,
 static ssize_t fault_inject_write(struct file *file, const char __user *buf,
                                  size_t len, loff_t *ppos)
 {
-       char write_buf[24];
+       char write_buf[INET6_ADDRSTRLEN];
        size_t size = min(sizeof(write_buf), len) - 1;
+       struct net *net = current->nsproxy->net_ns;
+       struct sockaddr_storage sa;
        u64 val;
 
        if (copy_from_user(write_buf, buf, size))
                return -EFAULT;
-
-       val = simple_strtoll(write_buf, NULL, 0);
-       nfsd_inject_set(file->f_dentry->d_inode->i_private, val);
+       write_buf[size] = '\0';
+
+       size = rpc_pton(net, write_buf, size, (struct sockaddr *)&sa, sizeof(sa));
+       if (size > 0)
+               nfsd_inject_set_client(file->f_dentry->d_inode->i_private, &sa, size);
+       else {
+               val = simple_strtoll(write_buf, NULL, 0);
+               nfsd_inject_set(file->f_dentry->d_inode->i_private, val);
+       }
        return len; /* on success, claim we got the whole input */
 }
 

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 9fb8e52..eff7340 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4763,6 +4763,21 @@ u64 nfsd_for_n_state(u64 max, u64 (*func)(struct nfs4_client *, u64))
        return count;
 }
 
+struct nfs4_client *nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
+{
+       struct nfs4_client *clp;
+       struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
+
+       if (!nfsd_netns_ready(nn))
+               return NULL;
+
+       list_for_each_entry(clp, &nn->client_lru, cl_lru) {
+               if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
+                       return clp;
+       }
+       return NULL;
+}
+
 #endif /* CONFIG_NFSD_FAULT_INJECTION */
 
 /* initialization to perform at module load time: */

diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 4017f35..d1c229f 100644 (file)
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -502,6 +502,7 @@ extern void nfsd4_record_grace_done(struct nfsd_net *nn, time_t boot_time);
 int nfsd_fault_inject_init(void);
 void nfsd_fault_inject_cleanup(void);
 u64 nfsd_for_n_state(u64, u64 (*)(struct nfs4_client *, u64));
+struct nfs4_client *nfsd_find_client(struct sockaddr_storage *, size_t);
 
 u64 nfsd_forget_client(struct nfs4_client *, u64);
 u64 nfsd_forget_client_locks(struct nfs4_client*, u64);