#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>
#define NFSDDBG_FACILITY NFSDDBG_PROC
+/* Globals */
+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)
{
crypto_free_tfm(tfm);
return status;
}
+
+static void
+nfsd4_sync_rec_dir(void)
+{
+ down(&rec_dir.dentry->d_inode->i_sem);
+ nfsd_sync_dir(rec_dir.dentry);
+ up(&rec_dir.dentry->d_inode->i_sem);
+}
+
+int
+nfsd4_create_clid_dir(struct nfs4_client *clp)
+{
+ 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);
+
+ /* lock the parent */
+ down(&rec_dir.dentry->d_inode->i_sem);
+
+ 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 = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU);
+out_put:
+ dput(dentry);
+out_unlock:
+ up(&rec_dir.dentry->d_inode->i_sem);
+ if (status == 0) {
+ clp->cl_firststate = 1;
+ nfsd4_sync_rec_dir();
+ }
+ nfs4_reset_user(uid, gid);
+ 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 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
+nfsd4_remove_clid_file(struct dentry *dir, struct dentry *dentry)
+{
+ int status;
+
+ if (!S_ISREG(dir->d_inode->i_mode)) {
+ printk("nfsd4: non-file found in client recovery directory\n");
+ return -EINVAL;
+ }
+ down(&dir->d_inode->i_sem);
+ status = vfs_unlink(dir->d_inode, dentry);
+ up(&dir->d_inode->i_sem);
+ return status;
+}
+
+static int
+nfsd4_clear_clid_dir(struct dentry *dir, struct dentry *dentry)
+{
+ int status;
+
+ /* For now this directory should already be empty, but we empty it of
+ * any regular files anyway, just in case the directory was created by
+ * a kernel from the future.... */
+ nfsd4_list_rec_dir(dentry, nfsd4_remove_clid_file);
+ down(&dir->d_inode->i_sem);
+ status = vfs_rmdir(dir->d_inode, dentry);
+ up(&dir->d_inode->i_sem);
+ 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);
+
+ down(&rec_dir.dentry->d_inode->i_sem);
+ dentry = lookup_one_len(name, rec_dir.dentry, namlen);
+ up(&rec_dir.dentry->d_inode->i_sem);
+ if (IS_ERR(dentry)) {
+ status = PTR_ERR(dentry);
+ return status;
+ }
+ status = -ENOENT;
+ if (!dentry->d_inode)
+ goto out;
+
+ status = nfsd4_clear_clid_dir(rec_dir.dentry, dentry);
+out:
+ dput(dentry);
+ return status;
+}
+
+void
+nfsd4_remove_clid_dir(struct nfs4_client *clp)
+{
+ uid_t uid;
+ gid_t gid;
+ int status;
+
+ if (!rec_dir_init || !clp->cl_firststate)
+ return;
+
+ clp->cl_firststate = 0;
+ nfs4_save_user(&uid, &gid);
+ status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
+ nfs4_reset_user(uid, gid);
+ if (status == 0)
+ nfsd4_sync_rec_dir();
+ 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;
+
+ if (nfs4_has_reclaimed_state(child->d_name.name))
+ return nfs_ok;
+
+ status = nfsd4_clear_clid_dir(parent, child);
+ if (status)
+ printk("failed to remove client recovery directory %s\n",
+ child->d_name.name);
+ /* Keep trying, success or failure: */
+ return nfs_ok;
+}
+
+void
+nfsd4_recdir_purge_old(void) {
+ int status;
+
+ if (!rec_dir_init)
+ return;
+ status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old);
+ if (status == 0)
+ nfsd4_sync_rec_dir();
+ if (status)
+ printk("nfsd4: failed to purge old clients from recovery"
+ " directory %s\n", rec_dir.dentry->d_name.name);
+ return;
+}
+
+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);
+}
projects / linux-2.6 / blobdiff