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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>
This commit is contained in:
Bryan Schumaker 2012-11-29 11:40:46 -05:00 committed by J. Bruce Fields
parent d7cc431edd
commit 6c1e82a4b7
3 changed files with 48 additions and 3 deletions
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35
fs/nfsd/fault_inject.c
View File

@ -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;
write_buf[size] = '\0';
val = simple_strtoll(write_buf, NULL, 0);
nfsd_inject_set(file->f_dentry->d_inode->i_private, val);
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 */
}

15
fs/nfsd/nfs4state.c
View File

@ -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: */

1
fs/nfsd/state.h
View File

@ -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);