X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fecryptfs%2Fsuper.c;h=b15a43a80ab78cc7dbb9e05dedef0dbb0dd0e6ee;hb=80f506918fdaaca6b574ba931536a58ce015c7be;hp=eaa5daaf106eec9aebb1271a1e3ae554a813c0a1;hpb=e94b1766097d53e6f3ccfb36c8baa562ffeda3fc;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/ecryptfs/super.c b/fs/ecryptfs/super.c
index eaa5daa..b15a43a 100644
--- a/fs/ecryptfs/super.c
+++ b/fs/ecryptfs/super.c
@@ -27,6 +27,8 @@
 #include <linux/mount.h>
 #include <linux/key.h>
 #include <linux/seq_file.h>
+#include <linux/smp_lock.h>
+#include <linux/file.h>
 #include <linux/crypto.h>
 #include "ecryptfs_kernel.h"
 
@@ -46,15 +48,16 @@ struct kmem_cache *ecryptfs_inode_info_cache;
  */
 static struct inode *ecryptfs_alloc_inode(struct super_block *sb)
 {
-	struct ecryptfs_inode_info *ecryptfs_inode;
+	struct ecryptfs_inode_info *inode_info;
 	struct inode *inode = NULL;
 
-	ecryptfs_inode = kmem_cache_alloc(ecryptfs_inode_info_cache,
-					  GFP_KERNEL);
-	if (unlikely(!ecryptfs_inode))
+	inode_info = kmem_cache_alloc(ecryptfs_inode_info_cache, GFP_KERNEL);
+	if (unlikely(!inode_info))
 		goto out;
-	ecryptfs_init_crypt_stat(&ecryptfs_inode->crypt_stat);
-	inode = &ecryptfs_inode->vfs_inode;
+	ecryptfs_init_crypt_stat(&inode_info->crypt_stat);
+	mutex_init(&inode_info->lower_file_mutex);
+	inode_info->lower_file = NULL;
+	inode = &inode_info->vfs_inode;
 out:
 	return inode;
 }
@@ -63,9 +66,10 @@ out:
  * ecryptfs_destroy_inode
  * @inode: The ecryptfs inode
  *
- * This is used during the final destruction of the inode.
- * All allocation of memory related to the inode, including allocated
- * memory in the crypt_stat struct, will be released here.
+ * This is used during the final destruction of the inode.  All
+ * allocation of memory related to the inode, including allocated
+ * memory in the crypt_stat struct, will be released here. This
+ * function also fput()'s the persistent file for the lower inode.
  * There should be no chance that this deallocation will be missed.
  */
 static void ecryptfs_destroy_inode(struct inode *inode)
@@ -73,7 +77,18 @@ static void ecryptfs_destroy_inode(struct inode *inode)
 	struct ecryptfs_inode_info *inode_info;
 
 	inode_info = ecryptfs_inode_to_private(inode);
-	ecryptfs_destruct_crypt_stat(&inode_info->crypt_stat);
+	if (inode_info->lower_file) {
+		struct dentry *lower_dentry =
+			inode_info->lower_file->f_dentry;
+
+		BUG_ON(!lower_dentry);
+		if (lower_dentry->d_inode) {
+			fput(inode_info->lower_file);
+			inode_info->lower_file = NULL;
+			d_drop(lower_dentry);
+		}
+	}
+	ecryptfs_destroy_crypt_stat(&inode_info->crypt_stat);
 	kmem_cache_free(ecryptfs_inode_info_cache, inode_info);
 }
 
@@ -104,9 +119,13 @@ static void ecryptfs_put_super(struct super_block *sb)
 {
 	struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb);
 
-	ecryptfs_destruct_mount_crypt_stat(&sb_info->mount_crypt_stat);
+	lock_kernel();
+
+	ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat);
 	kmem_cache_free(ecryptfs_sb_info_cache, sb_info);
 	ecryptfs_set_superblock_private(sb, NULL);
+
+	unlock_kernel();
 }
 
 /**
@@ -140,35 +159,46 @@ static void ecryptfs_clear_inode(struct inode *inode)
 /**
  * ecryptfs_show_options
  *
- * Prints the directory we are currently mounted over.
- * Returns zero on success; non-zero otherwise
+ * Prints the mount options for a given superblock.
+ * Returns zero; does not fail.
  */
 static int ecryptfs_show_options(struct seq_file *m, struct vfsmount *mnt)
 {
 	struct super_block *sb = mnt->mnt_sb;
-	struct dentry *lower_root_dentry = ecryptfs_dentry_to_lower(sb->s_root);
-	struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(sb->s_root);
-	char *tmp_page;
-	char *path;
-	int rc = 0;
-
-	tmp_page = (char *)__get_free_page(GFP_KERNEL);
-	if (!tmp_page) {
-		rc = -ENOMEM;
-		goto out;
-	}
-	path = d_path(lower_root_dentry, lower_mnt, tmp_page, PAGE_SIZE);
-	if (IS_ERR(path)) {
-		rc = PTR_ERR(path);
-		goto out;
+	struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
+		&ecryptfs_superblock_to_private(sb)->mount_crypt_stat;
+	struct ecryptfs_global_auth_tok *walker;
+
+	mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex);
+	list_for_each_entry(walker,
+			    &mount_crypt_stat->global_auth_tok_list,
+			    mount_crypt_stat_list) {
+		if (walker->flags & ECRYPTFS_AUTH_TOK_FNEK)
+			seq_printf(m, ",ecryptfs_fnek_sig=%s", walker->sig);
+		else
+			seq_printf(m, ",ecryptfs_sig=%s", walker->sig);
 	}
-	seq_printf(m, ",dir=%s", path);
-	free_page((unsigned long)tmp_page);
-out:
-	return rc;
+	mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex);
+
+	seq_printf(m, ",ecryptfs_cipher=%s",
+		mount_crypt_stat->global_default_cipher_name);
+
+	if (mount_crypt_stat->global_default_cipher_key_size)
+		seq_printf(m, ",ecryptfs_key_bytes=%zd",
+			   mount_crypt_stat->global_default_cipher_key_size);
+	if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)
+		seq_printf(m, ",ecryptfs_passthrough");
+	if (mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED)
+		seq_printf(m, ",ecryptfs_xattr_metadata");
+	if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
+		seq_printf(m, ",ecryptfs_encrypted_view");
+	if (mount_crypt_stat->flags & ECRYPTFS_UNLINK_SIGS)
+		seq_printf(m, ",ecryptfs_unlink_sigs");
+
+	return 0;
 }
 
-struct super_operations ecryptfs_sops = {
+const struct super_operations ecryptfs_sops = {
 	.alloc_inode = ecryptfs_alloc_inode,
 	.destroy_inode = ecryptfs_destroy_inode,
 	.drop_inode = generic_delete_inode,