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Linux/fs/ecryptfs/super.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /**
  3  * eCryptfs: Linux filesystem encryption layer
  4  *
  5  * Copyright (C) 1997-2003 Erez Zadok
  6  * Copyright (C) 2001-2003 Stony Brook University
  7  * Copyright (C) 2004-2006 International Business Machines Corp.
  8  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
  9  *              Michael C. Thompson <mcthomps@us.ibm.com>
 10  */
 11 
 12 #include <linux/fs.h>
 13 #include <linux/mount.h>
 14 #include <linux/key.h>
 15 #include <linux/slab.h>
 16 #include <linux/seq_file.h>
 17 #include <linux/file.h>
 18 #include <linux/statfs.h>
 19 #include <linux/magic.h>
 20 #include "ecryptfs_kernel.h"
 21 
 22 struct kmem_cache *ecryptfs_inode_info_cache;
 23 
 24 /**
 25  * ecryptfs_alloc_inode - allocate an ecryptfs inode
 26  * @sb: Pointer to the ecryptfs super block
 27  *
 28  * Called to bring an inode into existence.
 29  *
 30  * Only handle allocation, setting up structures should be done in
 31  * ecryptfs_read_inode. This is because the kernel, between now and
 32  * then, will 0 out the private data pointer.
 33  *
 34  * Returns a pointer to a newly allocated inode, NULL otherwise
 35  */
 36 static struct inode *ecryptfs_alloc_inode(struct super_block *sb)
 37 {
 38         struct ecryptfs_inode_info *inode_info;
 39         struct inode *inode = NULL;
 40 
 41         inode_info = kmem_cache_alloc(ecryptfs_inode_info_cache, GFP_KERNEL);
 42         if (unlikely(!inode_info))
 43                 goto out;
 44         if (ecryptfs_init_crypt_stat(&inode_info->crypt_stat)) {
 45                 kmem_cache_free(ecryptfs_inode_info_cache, inode_info);
 46                 goto out;
 47         }
 48         mutex_init(&inode_info->lower_file_mutex);
 49         atomic_set(&inode_info->lower_file_count, 0);
 50         inode_info->lower_file = NULL;
 51         inode = &inode_info->vfs_inode;
 52 out:
 53         return inode;
 54 }
 55 
 56 static void ecryptfs_free_inode(struct inode *inode)
 57 {
 58         struct ecryptfs_inode_info *inode_info;
 59         inode_info = ecryptfs_inode_to_private(inode);
 60 
 61         kmem_cache_free(ecryptfs_inode_info_cache, inode_info);
 62 }
 63 
 64 /**
 65  * ecryptfs_destroy_inode
 66  * @inode: The ecryptfs inode
 67  *
 68  * This is used during the final destruction of the inode.  All
 69  * allocation of memory related to the inode, including allocated
 70  * memory in the crypt_stat struct, will be released here.
 71  * There should be no chance that this deallocation will be missed.
 72  */
 73 static void ecryptfs_destroy_inode(struct inode *inode)
 74 {
 75         struct ecryptfs_inode_info *inode_info;
 76 
 77         inode_info = ecryptfs_inode_to_private(inode);
 78         BUG_ON(inode_info->lower_file);
 79         ecryptfs_destroy_crypt_stat(&inode_info->crypt_stat);
 80 }
 81 
 82 /**
 83  * ecryptfs_statfs
 84  * @sb: The ecryptfs super block
 85  * @buf: The struct kstatfs to fill in with stats
 86  *
 87  * Get the filesystem statistics. Currently, we let this pass right through
 88  * to the lower filesystem and take no action ourselves.
 89  */
 90 static int ecryptfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 91 {
 92         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 93         int rc;
 94 
 95         if (!lower_dentry->d_sb->s_op->statfs)
 96                 return -ENOSYS;
 97 
 98         rc = lower_dentry->d_sb->s_op->statfs(lower_dentry, buf);
 99         if (rc)
100                 return rc;
101 
102         buf->f_type = ECRYPTFS_SUPER_MAGIC;
103         rc = ecryptfs_set_f_namelen(&buf->f_namelen, buf->f_namelen,
104                &ecryptfs_superblock_to_private(dentry->d_sb)->mount_crypt_stat);
105 
106         return rc;
107 }
108 
109 /**
110  * ecryptfs_evict_inode
111  * @inode - The ecryptfs inode
112  *
113  * Called by iput() when the inode reference count reached zero
114  * and the inode is not hashed anywhere.  Used to clear anything
115  * that needs to be, before the inode is completely destroyed and put
116  * on the inode free list. We use this to drop out reference to the
117  * lower inode.
118  */
119 static void ecryptfs_evict_inode(struct inode *inode)
120 {
121         truncate_inode_pages_final(&inode->i_data);
122         clear_inode(inode);
123         iput(ecryptfs_inode_to_lower(inode));
124 }
125 
126 /**
127  * ecryptfs_show_options
128  *
129  * Prints the mount options for a given superblock.
130  * Returns zero; does not fail.
131  */
132 static int ecryptfs_show_options(struct seq_file *m, struct dentry *root)
133 {
134         struct super_block *sb = root->d_sb;
135         struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
136                 &ecryptfs_superblock_to_private(sb)->mount_crypt_stat;
137         struct ecryptfs_global_auth_tok *walker;
138 
139         mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex);
140         list_for_each_entry(walker,
141                             &mount_crypt_stat->global_auth_tok_list,
142                             mount_crypt_stat_list) {
143                 if (walker->flags & ECRYPTFS_AUTH_TOK_FNEK)
144                         seq_printf(m, ",ecryptfs_fnek_sig=%s", walker->sig);
145                 else
146                         seq_printf(m, ",ecryptfs_sig=%s", walker->sig);
147         }
148         mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex);
149 
150         seq_printf(m, ",ecryptfs_cipher=%s",
151                 mount_crypt_stat->global_default_cipher_name);
152 
153         if (mount_crypt_stat->global_default_cipher_key_size)
154                 seq_printf(m, ",ecryptfs_key_bytes=%zd",
155                            mount_crypt_stat->global_default_cipher_key_size);
156         if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)
157                 seq_printf(m, ",ecryptfs_passthrough");
158         if (mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED)
159                 seq_printf(m, ",ecryptfs_xattr_metadata");
160         if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
161                 seq_printf(m, ",ecryptfs_encrypted_view");
162         if (mount_crypt_stat->flags & ECRYPTFS_UNLINK_SIGS)
163                 seq_printf(m, ",ecryptfs_unlink_sigs");
164         if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY)
165                 seq_printf(m, ",ecryptfs_mount_auth_tok_only");
166 
167         return 0;
168 }
169 
170 const struct super_operations ecryptfs_sops = {
171         .alloc_inode = ecryptfs_alloc_inode,
172         .destroy_inode = ecryptfs_destroy_inode,
173         .free_inode = ecryptfs_free_inode,
174         .statfs = ecryptfs_statfs,
175         .remount_fs = NULL,
176         .evict_inode = ecryptfs_evict_inode,
177         .show_options = ecryptfs_show_options
178 };
179 

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