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TOMOYO Linux Cross Reference
Linux/fs/ecryptfs/super.c

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  1 /**
  2  * eCryptfs: Linux filesystem encryption layer
  3  *
  4  * Copyright (C) 1997-2003 Erez Zadok
  5  * Copyright (C) 2001-2003 Stony Brook University
  6  * Copyright (C) 2004-2006 International Business Machines Corp.
  7  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
  8  *              Michael C. Thompson <mcthomps@us.ibm.com>
  9  *
 10  * This program is free software; you can redistribute it and/or
 11  * modify it under the terms of the GNU General Public License as
 12  * published by the Free Software Foundation; either version 2 of the
 13  * License, or (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful, but
 16  * WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18  * General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public License
 21  * along with this program; if not, write to the Free Software
 22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 23  * 02111-1307, USA.
 24  */
 25 
 26 #include <linux/fs.h>
 27 #include <linux/mount.h>
 28 #include <linux/key.h>
 29 #include <linux/slab.h>
 30 #include <linux/seq_file.h>
 31 #include <linux/file.h>
 32 #include <linux/statfs.h>
 33 #include <linux/magic.h>
 34 #include "ecryptfs_kernel.h"
 35 
 36 struct kmem_cache *ecryptfs_inode_info_cache;
 37 
 38 /**
 39  * ecryptfs_alloc_inode - allocate an ecryptfs inode
 40  * @sb: Pointer to the ecryptfs super block
 41  *
 42  * Called to bring an inode into existence.
 43  *
 44  * Only handle allocation, setting up structures should be done in
 45  * ecryptfs_read_inode. This is because the kernel, between now and
 46  * then, will 0 out the private data pointer.
 47  *
 48  * Returns a pointer to a newly allocated inode, NULL otherwise
 49  */
 50 static struct inode *ecryptfs_alloc_inode(struct super_block *sb)
 51 {
 52         struct ecryptfs_inode_info *inode_info;
 53         struct inode *inode = NULL;
 54 
 55         inode_info = kmem_cache_alloc(ecryptfs_inode_info_cache, GFP_KERNEL);
 56         if (unlikely(!inode_info))
 57                 goto out;
 58         if (ecryptfs_init_crypt_stat(&inode_info->crypt_stat)) {
 59                 kmem_cache_free(ecryptfs_inode_info_cache, inode_info);
 60                 goto out;
 61         }
 62         mutex_init(&inode_info->lower_file_mutex);
 63         atomic_set(&inode_info->lower_file_count, 0);
 64         inode_info->lower_file = NULL;
 65         inode = &inode_info->vfs_inode;
 66 out:
 67         return inode;
 68 }
 69 
 70 static void ecryptfs_i_callback(struct rcu_head *head)
 71 {
 72         struct inode *inode = container_of(head, struct inode, i_rcu);
 73         struct ecryptfs_inode_info *inode_info;
 74         inode_info = ecryptfs_inode_to_private(inode);
 75 
 76         kmem_cache_free(ecryptfs_inode_info_cache, inode_info);
 77 }
 78 
 79 /**
 80  * ecryptfs_destroy_inode
 81  * @inode: The ecryptfs inode
 82  *
 83  * This is used during the final destruction of the inode.  All
 84  * allocation of memory related to the inode, including allocated
 85  * memory in the crypt_stat struct, will be released here.
 86  * There should be no chance that this deallocation will be missed.
 87  */
 88 static void ecryptfs_destroy_inode(struct inode *inode)
 89 {
 90         struct ecryptfs_inode_info *inode_info;
 91 
 92         inode_info = ecryptfs_inode_to_private(inode);
 93         BUG_ON(inode_info->lower_file);
 94         ecryptfs_destroy_crypt_stat(&inode_info->crypt_stat);
 95         call_rcu(&inode->i_rcu, ecryptfs_i_callback);
 96 }
 97 
 98 /**
 99  * ecryptfs_statfs
100  * @sb: The ecryptfs super block
101  * @buf: The struct kstatfs to fill in with stats
102  *
103  * Get the filesystem statistics. Currently, we let this pass right through
104  * to the lower filesystem and take no action ourselves.
105  */
106 static int ecryptfs_statfs(struct dentry *dentry, struct kstatfs *buf)
107 {
108         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
109         int rc;
110 
111         if (!lower_dentry->d_sb->s_op->statfs)
112                 return -ENOSYS;
113 
114         rc = lower_dentry->d_sb->s_op->statfs(lower_dentry, buf);
115         if (rc)
116                 return rc;
117 
118         buf->f_type = ECRYPTFS_SUPER_MAGIC;
119         rc = ecryptfs_set_f_namelen(&buf->f_namelen, buf->f_namelen,
120                &ecryptfs_superblock_to_private(dentry->d_sb)->mount_crypt_stat);
121 
122         return rc;
123 }
124 
125 /**
126  * ecryptfs_evict_inode
127  * @inode - The ecryptfs inode
128  *
129  * Called by iput() when the inode reference count reached zero
130  * and the inode is not hashed anywhere.  Used to clear anything
131  * that needs to be, before the inode is completely destroyed and put
132  * on the inode free list. We use this to drop out reference to the
133  * lower inode.
134  */
135 static void ecryptfs_evict_inode(struct inode *inode)
136 {
137         truncate_inode_pages_final(&inode->i_data);
138         clear_inode(inode);
139         iput(ecryptfs_inode_to_lower(inode));
140 }
141 
142 /**
143  * ecryptfs_show_options
144  *
145  * Prints the mount options for a given superblock.
146  * Returns zero; does not fail.
147  */
148 static int ecryptfs_show_options(struct seq_file *m, struct dentry *root)
149 {
150         struct super_block *sb = root->d_sb;
151         struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
152                 &ecryptfs_superblock_to_private(sb)->mount_crypt_stat;
153         struct ecryptfs_global_auth_tok *walker;
154 
155         mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex);
156         list_for_each_entry(walker,
157                             &mount_crypt_stat->global_auth_tok_list,
158                             mount_crypt_stat_list) {
159                 if (walker->flags & ECRYPTFS_AUTH_TOK_FNEK)
160                         seq_printf(m, ",ecryptfs_fnek_sig=%s", walker->sig);
161                 else
162                         seq_printf(m, ",ecryptfs_sig=%s", walker->sig);
163         }
164         mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex);
165 
166         seq_printf(m, ",ecryptfs_cipher=%s",
167                 mount_crypt_stat->global_default_cipher_name);
168 
169         if (mount_crypt_stat->global_default_cipher_key_size)
170                 seq_printf(m, ",ecryptfs_key_bytes=%zd",
171                            mount_crypt_stat->global_default_cipher_key_size);
172         if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)
173                 seq_printf(m, ",ecryptfs_passthrough");
174         if (mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED)
175                 seq_printf(m, ",ecryptfs_xattr_metadata");
176         if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
177                 seq_printf(m, ",ecryptfs_encrypted_view");
178         if (mount_crypt_stat->flags & ECRYPTFS_UNLINK_SIGS)
179                 seq_printf(m, ",ecryptfs_unlink_sigs");
180         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY)
181                 seq_printf(m, ",ecryptfs_mount_auth_tok_only");
182 
183         return 0;
184 }
185 
186 const struct super_operations ecryptfs_sops = {
187         .alloc_inode = ecryptfs_alloc_inode,
188         .destroy_inode = ecryptfs_destroy_inode,
189         .statfs = ecryptfs_statfs,
190         .remount_fs = NULL,
191         .evict_inode = ecryptfs_evict_inode,
192         .show_options = ecryptfs_show_options
193 };
194 

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