[PATCH] knfsd: nfsd4: initialize recovery directory

NFSv4 clients are required to know what state they have on the server so that
they can reclaim it on server reboot.  However, it is possible for
pathalogical combinations of server reboots and network partitions to leave a
client in a state where it cannot know whether it has lost its state on the
server.

For this reason, rfc3530 requires that we store some information about clients
to stable storage.

So we maintain a directory /var/lib/nfs/v4recovery with a subdirectory for
each client with active state.  We leave open the possibility of including
files underneath each such subdirectory with information about the client, but
for now the subdirectories are empty.

We create a client subdirectory whenever a client makes its first non-reclaim
open_confirm.

We remove a client subdirectory whenever either
        a) its lease expires, or
	b) the grace period ends without it reclaiming anything.
When handling reclaims, we allow the reclaim if and only if the client doing
the reclaim has a subdirectory.

This patch adds just the code to scan the recovery directory on nfsd startup.

Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2005-06-23 22:04:25 -07:00 committed by Linus Torvalds
parent cb36d63457
commit 190e4fbf96
3 changed files with 186 additions and 2 deletions

View File

@ -39,6 +39,9 @@
#include <linux/nfs4.h>
#include <linux/nfsd/state.h>
#include <linux/nfsd/xdr4.h>
#include <linux/param.h>
#include <linux/file.h>
#include <linux/namei.h>
#include <asm/uaccess.h>
#include <asm/scatterlist.h>
#include <linux/crypto.h>
@ -46,6 +49,27 @@
#define NFSDDBG_FACILITY NFSDDBG_PROC
/* Globals */
char recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
static struct nameidata rec_dir;
static int rec_dir_init = 0;
static void
nfs4_save_user(uid_t *saveuid, gid_t *savegid)
{
*saveuid = current->fsuid;
*savegid = current->fsgid;
current->fsuid = 0;
current->fsgid = 0;
}
static void
nfs4_reset_user(uid_t saveuid, gid_t savegid)
{
current->fsuid = saveuid;
current->fsgid = savegid;
}
static void
md5_to_hex(char *out, char *md5)
{
@ -95,3 +119,145 @@ nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname)
crypto_free_tfm(tfm);
return status;
}
typedef int (recdir_func)(struct dentry *, struct dentry *);
struct dentry_list {
struct dentry *dentry;
struct list_head list;
};
struct dentry_list_arg {
struct list_head dentries;
struct dentry *parent;
};
static int
nfsd4_build_dentrylist(void *arg, const char *name, int namlen,
loff_t offset, ino_t ino, unsigned int d_type)
{
struct dentry_list_arg *dla = arg;
struct list_head *dentries = &dla->dentries;
struct dentry *parent = dla->parent;
struct dentry *dentry;
struct dentry_list *child;
if (name && isdotent(name, namlen))
return nfs_ok;
dentry = lookup_one_len(name, parent, namlen);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
child = kmalloc(sizeof(*child), GFP_KERNEL);
if (child == NULL)
return -ENOMEM;
child->dentry = dentry;
list_add(&child->list, dentries);
return 0;
}
static int
nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f)
{
struct file *filp;
struct dentry_list_arg dla = {
.parent = dir,
};
struct list_head *dentries = &dla.dentries;
struct dentry_list *child;
uid_t uid;
gid_t gid;
int status;
if (!rec_dir_init)
return 0;
nfs4_save_user(&uid, &gid);
filp = dentry_open(dget(dir), mntget(rec_dir.mnt),
O_RDWR);
status = PTR_ERR(filp);
if (IS_ERR(filp))
goto out;
INIT_LIST_HEAD(dentries);
status = vfs_readdir(filp, nfsd4_build_dentrylist, &dla);
fput(filp);
while (!list_empty(dentries)) {
child = list_entry(dentries->next, struct dentry_list, list);
status = f(dir, child->dentry);
if (status)
goto out;
list_del(&child->list);
dput(child->dentry);
kfree(child);
}
out:
while (!list_empty(dentries)) {
child = list_entry(dentries->next, struct dentry_list, list);
list_del(&child->list);
dput(child->dentry);
kfree(child);
}
nfs4_reset_user(uid, gid);
return status;
}
static int
load_recdir(struct dentry *parent, struct dentry *child)
{
if (child->d_name.len != HEXDIR_LEN - 1) {
printk("nfsd4: illegal name %s in recovery directory\n",
child->d_name.name);
/* Keep trying; maybe the others are OK: */
return nfs_ok;
}
nfs4_client_to_reclaim(child->d_name.name);
return nfs_ok;
}
int
nfsd4_recdir_load(void) {
int status;
status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir);
if (status)
printk("nfsd4: failed loading clients from recovery"
" directory %s\n", rec_dir.dentry->d_name.name);
return status;
}
/*
* Hold reference to the recovery directory.
*/
void
nfsd4_init_recdir(char *rec_dirname)
{
uid_t uid = 0;
gid_t gid = 0;
int status;
printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
rec_dirname);
BUG_ON(rec_dir_init);
nfs4_save_user(&uid, &gid);
status = path_lookup(rec_dirname, LOOKUP_FOLLOW, &rec_dir);
if (status == -ENOENT)
printk("NFSD: recovery directory %s doesn't exist\n",
rec_dirname);
if (!status)
rec_dir_init = 1;
nfs4_reset_user(uid, gid);
}
void
nfsd4_shutdown_recdir(void)
{
if (!rec_dir_init)
return;
rec_dir_init = 0;
path_release(&rec_dir);
}

View File

@ -71,6 +71,7 @@ static stateid_t onestateid; /* bits all 1 */
static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
extern char recovery_dirname[];
/* Locking:
*
@ -3091,8 +3092,8 @@ alloc_reclaim(void)
/*
* failure => all reset bets are off, nfserr_no_grace...
*/
static int
nfs4_client_to_reclaim(char *name)
int
nfs4_client_to_reclaim(const char *name)
{
unsigned int strhashval;
struct nfs4_client_reclaim *crp = NULL;
@ -3202,6 +3203,17 @@ nfs4_state_init(void)
reclaim_str_hashtbl_size = 0;
}
static void
nfsd4_load_reboot_recovery_data(void)
{
int status;
nfsd4_init_recdir(recovery_dirname);
status = nfsd4_recdir_load();
if (status)
printk("NFSD: Failure reading reboot recovery data\n");
}
/* initialization to perform when the nfsd service is started: */
static void
@ -3228,6 +3240,7 @@ nfs4_state_start(void)
status = nfsd4_init_slabs();
if (status)
return status;
nfsd4_load_reboot_recovery_data();
__nfs4_state_start();
nfs4_init = 1;
return 0;
@ -3286,6 +3299,7 @@ __nfs4_state_shutdown(void)
cancel_delayed_work(&laundromat_work);
flush_workqueue(laundry_wq);
destroy_workqueue(laundry_wq);
nfsd4_shutdown_recdir();
nfs4_init = 0;
}

View File

@ -278,6 +278,10 @@ extern void nfsd4_probe_callback(struct nfs4_client *clp);
extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
extern void nfs4_put_delegation(struct nfs4_delegation *dp);
extern int nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname);
extern void nfsd4_init_recdir(char *recdir_name);
extern int nfsd4_recdir_load(void);
extern void nfsd4_shutdown_recdir(void);
extern int nfs4_client_to_reclaim(const char *name);
static inline void
nfs4_put_stateowner(struct nfs4_stateowner *so)