/*
-* 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 <asm/uaccess.h>
-#include <asm/scatterlist.h>
+#include <linux/file.h>
+#include <linux/slab.h>
+#include <linux/namei.h>
#include <linux/crypto.h>
+#include <linux/sched.h>
+#include "nfsd.h"
+#include "state.h"
+#include "vfs.h"
#define NFSDDBG_FACILITY NFSDDBG_PROC
+/* Globals */
+static struct path rec_dir;
+static int rec_dir_init = 0;
+
+static int
+nfs4_save_creds(const struct cred **original_creds)
+{
+ 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_creds(const struct cred *original)
+{
+ revert_creds(original);
+}
+
static void
md5_to_hex(char *out, char *md5)
{
*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;
+}
+
+static void
+nfsd4_sync_rec_dir(void)
+{
+ vfs_fsync(NULL, rec_dir.dentry, 0);
+}
+
+int
+nfsd4_create_clid_dir(struct nfs4_client *clp)
+{
+ const struct cred *original_cred;
+ char *dname = clp->cl_recdir;
+ struct dentry *dentry;
+ int status;
+
+ dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
+
+ if (!rec_dir_init || clp->cl_firststate)
+ return 0;
+
+ 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_namelist(void *arg, const char *name, int namlen,
+ loff_t offset, u64 ino, unsigned int d_type)
+{
+ 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;
+ 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;
+ LIST_HEAD(names);
+ struct name_list *entry;
+ struct dentry *dentry;
+ int status;
+
+ if (!rec_dir_init)
+ return 0;
+
+ status = nfs4_save_creds(&original_cred);
+ if (status < 0)
+ return status;
+
+ filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY,
+ current_cred());
+ status = PTR_ERR(filp);
+ if (IS_ERR(filp))
+ goto out;
+ status = vfs_readdir(filp, nfsd4_build_namelist, &names);
+ fput(filp);
+ 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)
+ break;
+ list_del(&entry->list);
+ kfree(entry);
+ }
+ mutex_unlock(&dir->d_inode->i_mutex);
+out:
+ while (!list_empty(&names)) {
+ entry = list_entry(names.next, struct name_list, list);
+ list_del(&entry->list);
+ kfree(entry);
+ }
+ 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 0;
+ }
+ nfs4_client_to_reclaim(child->d_name.name);
+ return 0;
+}
+
+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)
+{
+ 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);
+
+ 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 = 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_creds(original_cred);
+}
+
+void
+nfsd4_shutdown_recdir(void)
+{
+ if (!rec_dir_init)
+ return;
+ rec_dir_init = 0;
+ path_put(&rec_dir);
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff