#include <linux/file.h>
#include <linux/namei.h>
#include <asm/uaccess.h>
-#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
#include <linux/crypto.h>
-
+#include <linux/sched.h>
+#include <linux/mount.h>
#define NFSDDBG_FACILITY NFSDDBG_PROC
/* Globals */
-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
{
struct xdr_netobj cksum;
struct hash_desc desc;
- struct scatterlist sg[1];
+ struct scatterlist sg;
__be32 status = nfserr_resource;
dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
if (cksum.data == NULL)
goto out;
- 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);
- if (crypto_hash_digest(&desc, sg, sg->length, 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:
+ kfree(cksum.data);
crypto_free_hash(desc.tfm);
out_no_tfm:
return status;
int
nfsd4_create_clid_dir(struct nfs4_client *clp)
{
+ const struct cred *original_cred;
char *dname = clp->cl_recdir;
struct dentry *dentry;
- uid_t uid;
- gid_t gid;
int status;
dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
if (!rec_dir_init || clp->cl_firststate)
return 0;
- nfs4_save_user(&uid, &gid);
+ status = nfs4_save_creds(&original_cred);
+ if (status < 0)
+ return status;
/* lock the parent */
mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
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:
clp->cl_firststate = 1;
nfsd4_sync_rec_dir();
}
- nfs4_reset_user(uid, gid);
+ 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 dentry_list {
- struct dentry *dentry;
+struct name_list {
+ char name[HEXDIR_LEN];
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,
+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;
+ struct list_head *names = arg;
+ struct name_list *entry;
- if (name && isdotent(name, namlen))
+ if (namlen != HEXDIR_LEN - 1)
return 0;
- dentry = lookup_one_len(name, parent, namlen);
- if (IS_ERR(dentry))
- return PTR_ERR(dentry);
- child = kmalloc(sizeof(*child), GFP_KERNEL);
- if (child == NULL)
+ 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_RDONLY);
+ 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);
+ 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);
+ goto out;
+ }
+ status = f(dir, dentry);
+ dput(dentry);
if (status)
goto out;
- list_del(&child->list);
- dput(child->dentry);
- kfree(child);
+ list_del(&entry->list);
+ kfree(entry);
}
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;
}
printk("nfsd4: non-file found in client recovery directory\n");
return -EINVAL;
}
- mutex_lock(&dir->d_inode->i_mutex);
+ mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
status = vfs_unlink(dir->d_inode, dentry);
mutex_unlock(&dir->d_inode->i_mutex);
return status;
void
nfsd4_remove_clid_dir(struct nfs4_client *clp)
{
- uid_t uid;
- gid_t gid;
+ 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;
- nfs4_save_user(&uid, &gid);
+
+ status = nfs4_save_creds(&original_cred);
+ if (status < 0)
+ goto out;
+
status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
- nfs4_reset_user(uid, gid);
+ 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);
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);
- return;
}
static 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 | LOOKUP_DIRECTORY,
+ status = kern_path(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
&rec_dir);
if (status)
printk("NFSD: unable to find recovery directory %s\n",
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);
}