cregit-Linux how code gets into the kernel

Release 4.18 fs/ecryptfs/super.c

Directory: fs/ecryptfs
 * eCryptfs: Linux filesystem encryption layer
 * Copyright (C) 1997-2003 Erez Zadok
 * Copyright (C) 2001-2003 Stony Brook University
 * Copyright (C) 2004-2006 International Business Machines Corp.
 *   Author(s): Michael A. Halcrow <>
 *              Michael C. Thompson <>
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.

#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/key.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/file.h>
#include <linux/statfs.h>
#include <linux/magic.h>
#include "ecryptfs_kernel.h"

struct kmem_cache *ecryptfs_inode_info_cache;

 * ecryptfs_alloc_inode - allocate an ecryptfs inode
 * @sb: Pointer to the ecryptfs super block
 * Called to bring an inode into existence.
 * Only handle allocation, setting up structures should be done in
 * ecryptfs_read_inode. This is because the kernel, between now and
 * then, will 0 out the private data pointer.
 * Returns a pointer to a newly allocated inode, NULL otherwise

static struct inode *ecryptfs_alloc_inode(struct super_block *sb) { struct ecryptfs_inode_info *inode_info; struct inode *inode = NULL; inode_info = kmem_cache_alloc(ecryptfs_inode_info_cache, GFP_KERNEL); if (unlikely(!inode_info)) goto out; if (ecryptfs_init_crypt_stat(&inode_info->crypt_stat)) { kmem_cache_free(ecryptfs_inode_info_cache, inode_info); goto out; } mutex_init(&inode_info->lower_file_mutex); atomic_set(&inode_info->lower_file_count, 0); inode_info->lower_file = NULL; inode = &inode_info->vfs_inode; out: return inode; }


Michael Halcrow7067.96%240.00%
Tyler Hicks1817.48%120.00%
Herbert Xu1413.59%120.00%
Christoph Lameter10.97%120.00%

static void ecryptfs_i_callback(struct rcu_head *head) { struct inode *inode = container_of(head, struct inode, i_rcu); struct ecryptfs_inode_info *inode_info; inode_info = ecryptfs_inode_to_private(inode); kmem_cache_free(ecryptfs_inode_info_cache, inode_info); }


Nicholas Piggin45100.00%1100.00%

/** * 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. * There should be no chance that this deallocation will be missed. */
static void ecryptfs_destroy_inode(struct inode *inode) { struct ecryptfs_inode_info *inode_info; inode_info = ecryptfs_inode_to_private(inode); BUG_ON(inode_info->lower_file); ecryptfs_destroy_crypt_stat(&inode_info->crypt_stat); call_rcu(&inode->i_rcu, ecryptfs_i_callback); }


Michael Halcrow4287.50%375.00%
Nicholas Piggin612.50%125.00%

/** * ecryptfs_statfs * @sb: The ecryptfs super block * @buf: The struct kstatfs to fill in with stats * * Get the filesystem statistics. Currently, we let this pass right through * to the lower filesystem and take no action ourselves. */
static int ecryptfs_statfs(struct dentry *dentry, struct kstatfs *buf) { struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); int rc; if (!lower_dentry->d_sb->s_op->statfs) return -ENOSYS; rc = lower_dentry->d_sb->s_op->statfs(lower_dentry, buf); if (rc) return rc; buf->f_type = ECRYPTFS_SUPER_MAGIC; rc = ecryptfs_set_f_namelen(&buf->f_namelen, buf->f_namelen, &ecryptfs_superblock_to_private(dentry->d_sb)->mount_crypt_stat); return rc; }


Tyler Hicks4545.45%133.33%
Christoph Hellwig3030.30%133.33%
Michael Halcrow2424.24%133.33%

/** * ecryptfs_evict_inode * @inode - The ecryptfs inode * * Called by iput() when the inode reference count reached zero * and the inode is not hashed anywhere. Used to clear anything * that needs to be, before the inode is completely destroyed and put * on the inode free list. We use this to drop out reference to the * lower inode. */
static void ecryptfs_evict_inode(struct inode *inode) { truncate_inode_pages_final(&inode->i_data); clear_inode(inode); iput(ecryptfs_inode_to_lower(inode)); }


Michael Halcrow1856.25%125.00%
Al Viro1237.50%125.00%
Jan Kara13.12%125.00%
Johannes Weiner13.12%125.00%

/** * ecryptfs_show_options * * Prints the mount options for a given superblock. * Returns zero; does not fail. */
static int ecryptfs_show_options(struct seq_file *m, struct dentry *root) { struct super_block *sb = root->d_sb; 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); } 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"); if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY) seq_printf(m, ",ecryptfs_mount_auth_tok_only"); return 0; }


Eric Sandeen9345.15%116.67%
Michael Halcrow5928.64%116.67%
Tyler Hicks5024.27%350.00%
Al Viro41.94%116.67%

const struct super_operations ecryptfs_sops = { .alloc_inode = ecryptfs_alloc_inode, .destroy_inode = ecryptfs_destroy_inode, .statfs = ecryptfs_statfs, .remount_fs = NULL, .evict_inode = ecryptfs_evict_inode, .show_options = ecryptfs_show_options };

Overall Contributors

Michael Halcrow27344.90%420.00%
Tyler Hicks12019.74%525.00%
Eric Sandeen9415.46%15.00%
Nicholas Piggin518.39%15.00%
Christoph Hellwig304.93%15.00%
Al Viro193.12%210.00%
Herbert Xu142.30%15.00%
Tejun Heo30.49%15.00%
Josef 'Jeff' Sipek10.16%15.00%
Christoph Lameter10.16%15.00%
Jan Kara10.16%15.00%
Johannes Weiner10.16%15.00%
Directory: fs/ecryptfs
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