/*
-* linux/fs/nfsd/nfs4recover.c
-*
* Copyright (c) 2004 The Regents of the University of Michigan.
* All rights reserved.
*
*
*/
-
-#include <linux/sunrpc/svc.h>
-#include <linux/nfsd/nfsd.h>
-#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>
+#include <linux/sched.h>
+#include "nfsd.h"
+#include "state.h"
+#include "vfs.h"
#define NFSDDBG_FACILITY NFSDDBG_PROC
/* Globals */
-char recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
-static struct nameidata rec_dir;
+static struct path rec_dir;
static int rec_dir_init = 0;
-static void
-nfs4_save_user(uid_t *saveuid, gid_t *savegid)
+static int
+nfs4_save_creds(const struct cred **original_creds)
{
- *saveuid = current->fsuid;
- *savegid = current->fsgid;
- current->fsuid = 0;
- current->fsgid = 0;
+ struct cred *new;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+
+ new->fsuid = 0;
+ new->fsgid = 0;
+ *original_creds = override_creds(new);
+ put_cred(new);
+ return 0;
}
static void
-nfs4_reset_user(uid_t saveuid, gid_t savegid)
+nfs4_reset_creds(const struct cred *original)
{
- current->fsuid = saveuid;
- current->fsgid = savegid;
+ revert_creds(original);
}
static void
*out = '\0';
}
-int
+__be32
nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname)
{
struct xdr_netobj cksum;
- struct crypto_tfm *tfm;
- struct scatterlist sg[1];
- int status = nfserr_resource;
+ struct hash_desc desc;
+ struct scatterlist sg;
+ __be32 status = nfserr_resource;
dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
clname->len, clname->data);
- tfm = crypto_alloc_tfm("md5", 0);
- if (tfm == NULL)
- goto out;
- cksum.len = crypto_tfm_alg_digestsize(tfm);
+ desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+ desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(desc.tfm))
+ goto out_no_tfm;
+ cksum.len = crypto_hash_digestsize(desc.tfm);
cksum.data = kmalloc(cksum.len, GFP_KERNEL);
if (cksum.data == NULL)
goto out;
- crypto_digest_init(tfm);
- sg[0].page = virt_to_page(clname->data);
- sg[0].offset = offset_in_page(clname->data);
- sg[0].length = clname->len;
+ sg_init_one(&sg, clname->data, clname->len);
- crypto_digest_update(tfm, sg, 1);
- crypto_digest_final(tfm, cksum.data);
+ if (crypto_hash_digest(&desc, &sg, sg.length, cksum.data))
+ goto out;
md5_to_hex(dname, cksum.data);
- kfree(cksum.data);
status = nfs_ok;
out:
- if (tfm)
- crypto_free_tfm(tfm);
+ kfree(cksum.data);
+ crypto_free_hash(desc.tfm);
+out_no_tfm:
return status;
}
-typedef int (recdir_func)(struct dentry *, struct dentry *);
+static void
+nfsd4_sync_rec_dir(void)
+{
+ vfs_fsync(NULL, rec_dir.dentry, 0);
+}
-struct dentry_list {
+int
+nfsd4_create_clid_dir(struct nfs4_client *clp)
+{
+ const struct cred *original_cred;
+ char *dname = clp->cl_recdir;
struct dentry *dentry;
- struct list_head list;
-};
+ int status;
+
+ dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
+
+ if (!rec_dir_init || clp->cl_firststate)
+ return 0;
-struct dentry_list_arg {
- struct list_head dentries;
- struct dentry *parent;
+ status = nfs4_save_creds(&original_cred);
+ if (status < 0)
+ return status;
+
+ /* lock the parent */
+ mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
+
+ dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1);
+ if (IS_ERR(dentry)) {
+ status = PTR_ERR(dentry);
+ goto out_unlock;
+ }
+ status = -EEXIST;
+ if (dentry->d_inode) {
+ dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n");
+ goto out_put;
+ }
+ status = mnt_want_write(rec_dir.mnt);
+ if (status)
+ goto out_put;
+ status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU);
+ mnt_drop_write(rec_dir.mnt);
+out_put:
+ dput(dentry);
+out_unlock:
+ mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
+ if (status == 0) {
+ clp->cl_firststate = 1;
+ nfsd4_sync_rec_dir();
+ }
+ nfs4_reset_creds(original_cred);
+ dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status);
+ return status;
+}
+
+typedef int (recdir_func)(struct dentry *, struct dentry *);
+
+struct name_list {
+ char name[HEXDIR_LEN];
+ struct list_head list;
};
static int
-nfsd4_build_dentrylist(void *arg, const char *name, int namlen,
- loff_t offset, ino_t ino, unsigned int d_type)
+nfsd4_build_namelist(void *arg, const char *name, int namlen,
+ loff_t offset, u64 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)
+ struct list_head *names = arg;
+ struct name_list *entry;
+
+ if (namlen != HEXDIR_LEN - 1)
+ return 0;
+ entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
+ if (entry == NULL)
return -ENOMEM;
- child->dentry = dentry;
- list_add(&child->list, dentries);
+ memcpy(entry->name, name, HEXDIR_LEN - 1);
+ entry->name[HEXDIR_LEN - 1] = '\0';
+ list_add(&entry->list, names);
return 0;
}
static int
nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f)
{
+ const struct cred *original_cred;
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;
+ LIST_HEAD(names);
+ struct name_list *entry;
+ struct dentry *dentry;
int status;
if (!rec_dir_init)
return 0;
- nfs4_save_user(&uid, &gid);
+ status = nfs4_save_creds(&original_cred);
+ if (status < 0)
+ return status;
- filp = dentry_open(dget(dir), mntget(rec_dir.mnt),
- O_RDWR);
+ filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY,
+ current_cred());
status = PTR_ERR(filp);
if (IS_ERR(filp))
goto out;
- INIT_LIST_HEAD(dentries);
- status = vfs_readdir(filp, nfsd4_build_dentrylist, &dla);
+ status = vfs_readdir(filp, nfsd4_build_namelist, &names);
fput(filp);
- while (!list_empty(dentries)) {
- child = list_entry(dentries->next, struct dentry_list, list);
- status = f(dir, child->dentry);
+ mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
+ while (!list_empty(&names)) {
+ entry = list_entry(names.next, struct name_list, list);
+
+ dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
+ if (IS_ERR(dentry)) {
+ status = PTR_ERR(dentry);
+ break;
+ }
+ status = f(dir, dentry);
+ dput(dentry);
if (status)
- goto out;
- list_del(&child->list);
- dput(child->dentry);
- kfree(child);
+ break;
+ list_del(&entry->list);
+ kfree(entry);
}
+ mutex_unlock(&dir->d_inode->i_mutex);
out:
- while (!list_empty(dentries)) {
- child = list_entry(dentries->next, struct dentry_list, list);
- list_del(&child->list);
- dput(child->dentry);
- kfree(child);
+ while (!list_empty(&names)) {
+ entry = list_entry(names.next, struct name_list, list);
+ list_del(&entry->list);
+ kfree(entry);
}
- nfs4_reset_user(uid, gid);
+ nfs4_reset_creds(original_cred);
return status;
}
static int
+nfsd4_unlink_clid_dir(char *name, int namlen)
+{
+ struct dentry *dentry;
+ int status;
+
+ dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
+
+ mutex_lock_nested(&rec_dir.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
+ dentry = lookup_one_len(name, rec_dir.dentry, namlen);
+ if (IS_ERR(dentry)) {
+ status = PTR_ERR(dentry);
+ goto out_unlock;
+ }
+ status = -ENOENT;
+ if (!dentry->d_inode)
+ goto out;
+ status = vfs_rmdir(rec_dir.dentry->d_inode, dentry);
+out:
+ dput(dentry);
+out_unlock:
+ mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
+ return status;
+}
+
+void
+nfsd4_remove_clid_dir(struct nfs4_client *clp)
+{
+ const struct cred *original_cred;
+ int status;
+
+ if (!rec_dir_init || !clp->cl_firststate)
+ return;
+
+ status = mnt_want_write(rec_dir.mnt);
+ if (status)
+ goto out;
+ clp->cl_firststate = 0;
+
+ status = nfs4_save_creds(&original_cred);
+ if (status < 0)
+ goto out;
+
+ status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
+ nfs4_reset_creds(original_cred);
+ if (status == 0)
+ nfsd4_sync_rec_dir();
+ mnt_drop_write(rec_dir.mnt);
+out:
+ if (status)
+ printk("NFSD: Failed to remove expired client state directory"
+ " %.*s\n", HEXDIR_LEN, clp->cl_recdir);
+ return;
+}
+
+static int
+purge_old(struct dentry *parent, struct dentry *child)
+{
+ int status;
+
+ /* note: we currently use this path only for minorversion 0 */
+ if (nfs4_has_reclaimed_state(child->d_name.name, false))
+ return 0;
+
+ status = vfs_rmdir(parent->d_inode, child);
+ if (status)
+ printk("failed to remove client recovery directory %s\n",
+ child->d_name.name);
+ /* Keep trying, success or failure: */
+ return 0;
+}
+
+void
+nfsd4_recdir_purge_old(void) {
+ int status;
+
+ if (!rec_dir_init)
+ return;
+ status = mnt_want_write(rec_dir.mnt);
+ if (status)
+ goto out;
+ status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old);
+ if (status == 0)
+ nfsd4_sync_rec_dir();
+ mnt_drop_write(rec_dir.mnt);
+out:
+ if (status)
+ printk("nfsd4: failed to purge old clients from recovery"
+ " directory %s\n", rec_dir.dentry->d_name.name);
+}
+
+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;
+ return 0;
}
nfs4_client_to_reclaim(child->d_name.name);
- return nfs_ok;
+ return 0;
}
int
void
nfsd4_init_recdir(char *rec_dirname)
{
- uid_t uid = 0;
- gid_t gid = 0;
- int status;
+ const struct cred *original_cred;
+ 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 = nfs4_save_creds(&original_cred);
+ if (status < 0) {
+ printk("NFSD: Unable to change credentials to find recovery"
+ " directory: error %d\n",
+ status);
+ return;
+ }
- status = path_lookup(rec_dirname, LOOKUP_FOLLOW, &rec_dir);
- if (status == -ENOENT)
- printk("NFSD: recovery directory %s doesn't exist\n",
+ status = kern_path(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
+ &rec_dir);
+ if (status)
+ printk("NFSD: unable to find recovery directory %s\n",
rec_dirname);
if (!status)
rec_dir_init = 1;
- nfs4_reset_user(uid, gid);
+ nfs4_reset_creds(original_cred);
}
void
if (!rec_dir_init)
return;
rec_dir_init = 0;
- path_release(&rec_dir);
+ path_put(&rec_dir);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff