Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-for-linus-2.6

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

diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 2dc9851a1d3739040d5abce29fe4150d06969462..954cf893d50c34513c8c7167173a479dc9eb026d 100644 (file)
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -50,7 +50,6 @@
 #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;
 
@@ -94,7 +93,7 @@ nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname)
 
        dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
                        clname->len, clname->data);
-       tfm = crypto_alloc_tfm("md5", 0);
+       tfm = crypto_alloc_tfm("md5", CRYPTO_TFM_REQ_MAY_SLEEP);
        if (tfm == NULL)
                goto out;
        cksum.len = crypto_tfm_alg_digestsize(tfm);
@@ -115,8 +114,58 @@ nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname)
        kfree(cksum.data);
        status = nfs_ok;
 out:
-       if (tfm)
-               crypto_free_tfm(tfm);
+       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;
 }
 
@@ -201,6 +250,114 @@ out:
        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)
 {