include/asm-x86/pgtable-2level.h: checkpatch cleanups - formatting only

[sfrench/cifs-2.6.git] / fs / ecryptfs / super.c

diff --git a/fs/ecryptfs/super.c b/fs/ecryptfs/super.c
index 7b3f0cc09a6fd4eeaa6157f4eecaba2df6b6a6e1..c27ac2b358a12d7334003980b4b7d5fc8066cffa 100644 (file)
--- a/fs/ecryptfs/super.c
+++ b/fs/ecryptfs/super.c
@@ -27,6 +27,7 @@
 #include <linux/mount.h>
 #include <linux/key.h>
 #include <linux/seq_file.h>
+#include <linux/file.h>
 #include <linux/crypto.h>
 #include "ecryptfs_kernel.h"
 
@@ -46,15 +47,16 @@ 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 +65,10 @@ 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 +76,20 @@ 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);
+       mutex_lock(&inode_info->lower_file_mutex);
+       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);
+               }
+       }
+       mutex_unlock(&inode_info->lower_file_mutex);
+       ecryptfs_destroy_crypt_stat(&inode_info->crypt_stat);
        kmem_cache_free(ecryptfs_inode_info_cache, inode_info);
 }
 
@@ -104,7 +120,7 @@ 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);
+       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);
 }
@@ -140,32 +156,38 @@ 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) {
+               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");
+
+       return 0;
 }
 
 const struct super_operations ecryptfs_sops = {