[PATCH] knfsd: nfsd4: initialize recovery directory

[safe/jmp/linux-2.6] / fs / nfsd / nfs4recover.c

diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 841a305..2dc9851 100644 (file)
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -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 @@ out:
                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);
+}