2006-10-04 09:16:22 +00:00
|
|
|
/**
|
|
|
|
* 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 <mahalcro@us.ibm.com>
|
|
|
|
* Michael C. Thompson <mcthomps@us.ibm.com>
|
|
|
|
*
|
|
|
|
* 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
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
|
* 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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
|
|
|
#include <linux/slab.h>
|
2006-10-04 09:16:22 +00:00
|
|
|
#include <linux/seq_file.h>
|
push BKL down into ->put_super
Move BKL into ->put_super from the only caller. A couple of
filesystems had trivial enough ->put_super (only kfree and NULLing of
s_fs_info + stuff in there) to not get any locking: coda, cramfs, efs,
hugetlbfs, omfs, qnx4, shmem, all others got the full treatment. Most
of them probably don't need it, but I'd rather sort that out individually.
Preferably after all the other BKL pushdowns in that area.
[AV: original used to move lock_super() down as well; these changes are
removed since we don't do lock_super() at all in generic_shutdown_super()
now]
[AV: fuse, btrfs and xfs are known to need no damn BKL, exempt]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-05-05 13:40:36 +00:00
|
|
|
#include <linux/smp_lock.h>
|
2007-10-16 08:28:09 +00:00
|
|
|
#include <linux/file.h>
|
2006-10-04 09:16:22 +00:00
|
|
|
#include <linux/crypto.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)
|
|
|
|
{
|
2007-10-16 08:28:12 +00:00
|
|
|
struct ecryptfs_inode_info *inode_info;
|
2006-10-04 09:16:22 +00:00
|
|
|
struct inode *inode = NULL;
|
|
|
|
|
2007-10-16 08:28:12 +00:00
|
|
|
inode_info = kmem_cache_alloc(ecryptfs_inode_info_cache, GFP_KERNEL);
|
|
|
|
if (unlikely(!inode_info))
|
2006-10-04 09:16:22 +00:00
|
|
|
goto out;
|
2007-10-16 08:28:12 +00:00
|
|
|
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;
|
2006-10-04 09:16:22 +00:00
|
|
|
out:
|
|
|
|
return inode;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ecryptfs_destroy_inode
|
|
|
|
* @inode: The ecryptfs inode
|
|
|
|
*
|
2007-10-16 08:28:09 +00:00
|
|
|
* 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.
|
2006-10-04 09:16:22 +00:00
|
|
|
* 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);
|
2007-10-16 08:28:09 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
}
|
2007-10-16 08:28:01 +00:00
|
|
|
ecryptfs_destroy_crypt_stat(&inode_info->crypt_stat);
|
2006-10-04 09:16:22 +00:00
|
|
|
kmem_cache_free(ecryptfs_inode_info_cache, inode_info);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ecryptfs_init_inode
|
|
|
|
* @inode: The ecryptfs inode
|
|
|
|
*
|
|
|
|
* Set up the ecryptfs inode.
|
|
|
|
*/
|
|
|
|
void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode)
|
|
|
|
{
|
|
|
|
ecryptfs_set_inode_lower(inode, lower_inode);
|
|
|
|
inode->i_ino = lower_inode->i_ino;
|
|
|
|
inode->i_version++;
|
|
|
|
inode->i_op = &ecryptfs_main_iops;
|
|
|
|
inode->i_fop = &ecryptfs_main_fops;
|
|
|
|
inode->i_mapping->a_ops = &ecryptfs_aops;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ecryptfs_put_super
|
|
|
|
* @sb: Pointer to the ecryptfs super block
|
|
|
|
*
|
|
|
|
* Final actions when unmounting a file system.
|
|
|
|
* This will handle deallocation and release of our private data.
|
|
|
|
*/
|
|
|
|
static void ecryptfs_put_super(struct super_block *sb)
|
|
|
|
{
|
|
|
|
struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb);
|
|
|
|
|
push BKL down into ->put_super
Move BKL into ->put_super from the only caller. A couple of
filesystems had trivial enough ->put_super (only kfree and NULLing of
s_fs_info + stuff in there) to not get any locking: coda, cramfs, efs,
hugetlbfs, omfs, qnx4, shmem, all others got the full treatment. Most
of them probably don't need it, but I'd rather sort that out individually.
Preferably after all the other BKL pushdowns in that area.
[AV: original used to move lock_super() down as well; these changes are
removed since we don't do lock_super() at all in generic_shutdown_super()
now]
[AV: fuse, btrfs and xfs are known to need no damn BKL, exempt]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-05-05 13:40:36 +00:00
|
|
|
lock_kernel();
|
|
|
|
|
2007-10-16 08:28:01 +00:00
|
|
|
ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat);
|
2010-04-22 10:22:04 +00:00
|
|
|
bdi_destroy(&sb_info->bdi);
|
2006-10-04 09:16:22 +00:00
|
|
|
kmem_cache_free(ecryptfs_sb_info_cache, sb_info);
|
|
|
|
ecryptfs_set_superblock_private(sb, NULL);
|
push BKL down into ->put_super
Move BKL into ->put_super from the only caller. A couple of
filesystems had trivial enough ->put_super (only kfree and NULLing of
s_fs_info + stuff in there) to not get any locking: coda, cramfs, efs,
hugetlbfs, omfs, qnx4, shmem, all others got the full treatment. Most
of them probably don't need it, but I'd rather sort that out individually.
Preferably after all the other BKL pushdowns in that area.
[AV: original used to move lock_super() down as well; these changes are
removed since we don't do lock_super() at all in generic_shutdown_super()
now]
[AV: fuse, btrfs and xfs are known to need no damn BKL, exempt]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-05-05 13:40:36 +00:00
|
|
|
|
|
|
|
unlock_kernel();
|
2006-10-04 09:16:22 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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)
|
|
|
|
{
|
|
|
|
return vfs_statfs(ecryptfs_dentry_to_lower(dentry), buf);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ecryptfs_clear_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_clear_inode(struct inode *inode)
|
|
|
|
{
|
|
|
|
iput(ecryptfs_inode_to_lower(inode));
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ecryptfs_show_options
|
|
|
|
*
|
2008-02-06 09:38:34 +00:00
|
|
|
* Prints the mount options for a given superblock.
|
|
|
|
* Returns zero; does not fail.
|
2006-10-04 09:16:22 +00:00
|
|
|
*/
|
|
|
|
static int ecryptfs_show_options(struct seq_file *m, struct vfsmount *mnt)
|
|
|
|
{
|
|
|
|
struct super_block *sb = mnt->mnt_sb;
|
2008-02-06 09:38:34 +00:00
|
|
|
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) {
|
2009-03-16 17:35:12 +00:00
|
|
|
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);
|
2006-10-04 09:16:22 +00:00
|
|
|
}
|
2008-02-06 09:38:34 +00:00
|
|
|
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");
|
2009-04-22 09:08:46 +00:00
|
|
|
if (mount_crypt_stat->flags & ECRYPTFS_UNLINK_SIGS)
|
|
|
|
seq_printf(m, ",ecryptfs_unlink_sigs");
|
2008-02-06 09:38:34 +00:00
|
|
|
|
|
|
|
return 0;
|
2006-10-04 09:16:22 +00:00
|
|
|
}
|
|
|
|
|
2007-02-12 08:55:41 +00:00
|
|
|
const struct super_operations ecryptfs_sops = {
|
2006-10-04 09:16:22 +00:00
|
|
|
.alloc_inode = ecryptfs_alloc_inode,
|
|
|
|
.destroy_inode = ecryptfs_destroy_inode,
|
|
|
|
.drop_inode = generic_delete_inode,
|
|
|
|
.put_super = ecryptfs_put_super,
|
|
|
|
.statfs = ecryptfs_statfs,
|
|
|
|
.remount_fs = NULL,
|
|
|
|
.clear_inode = ecryptfs_clear_inode,
|
|
|
|
.show_options = ecryptfs_show_options
|
|
|
|
};
|