411 lines
9.2 KiB
C
411 lines
9.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* acl.c
|
|
*
|
|
* Copyright (C) 2004, 2008 Oracle. All rights reserved.
|
|
*
|
|
* CREDITS:
|
|
* Lots of code in this file is copy from linux/fs/ext3/acl.c.
|
|
* Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/string.h>
|
|
|
|
#include <cluster/masklog.h>
|
|
|
|
#include "ocfs2.h"
|
|
#include "alloc.h"
|
|
#include "dlmglue.h"
|
|
#include "file.h"
|
|
#include "inode.h"
|
|
#include "journal.h"
|
|
#include "ocfs2_fs.h"
|
|
|
|
#include "xattr.h"
|
|
#include "acl.h"
|
|
|
|
/*
|
|
* Convert from xattr value to acl struct.
|
|
*/
|
|
static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size)
|
|
{
|
|
int n, count;
|
|
struct posix_acl *acl;
|
|
|
|
if (!value)
|
|
return NULL;
|
|
if (size < sizeof(struct posix_acl_entry))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
count = size / sizeof(struct posix_acl_entry);
|
|
|
|
acl = posix_acl_alloc(count, GFP_NOFS);
|
|
if (!acl)
|
|
return ERR_PTR(-ENOMEM);
|
|
for (n = 0; n < count; n++) {
|
|
struct ocfs2_acl_entry *entry =
|
|
(struct ocfs2_acl_entry *)value;
|
|
|
|
acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
|
|
acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
|
|
switch(acl->a_entries[n].e_tag) {
|
|
case ACL_USER:
|
|
acl->a_entries[n].e_uid =
|
|
make_kuid(&init_user_ns,
|
|
le32_to_cpu(entry->e_id));
|
|
break;
|
|
case ACL_GROUP:
|
|
acl->a_entries[n].e_gid =
|
|
make_kgid(&init_user_ns,
|
|
le32_to_cpu(entry->e_id));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
value += sizeof(struct posix_acl_entry);
|
|
|
|
}
|
|
return acl;
|
|
}
|
|
|
|
/*
|
|
* Convert acl struct to xattr value.
|
|
*/
|
|
static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size)
|
|
{
|
|
struct ocfs2_acl_entry *entry = NULL;
|
|
char *ocfs2_acl;
|
|
size_t n;
|
|
|
|
*size = acl->a_count * sizeof(struct posix_acl_entry);
|
|
|
|
ocfs2_acl = kmalloc(*size, GFP_NOFS);
|
|
if (!ocfs2_acl)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
entry = (struct ocfs2_acl_entry *)ocfs2_acl;
|
|
for (n = 0; n < acl->a_count; n++, entry++) {
|
|
entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
|
|
entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
|
|
switch(acl->a_entries[n].e_tag) {
|
|
case ACL_USER:
|
|
entry->e_id = cpu_to_le32(
|
|
from_kuid(&init_user_ns,
|
|
acl->a_entries[n].e_uid));
|
|
break;
|
|
case ACL_GROUP:
|
|
entry->e_id = cpu_to_le32(
|
|
from_kgid(&init_user_ns,
|
|
acl->a_entries[n].e_gid));
|
|
break;
|
|
default:
|
|
entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
|
|
break;
|
|
}
|
|
}
|
|
return ocfs2_acl;
|
|
}
|
|
|
|
static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
|
|
int type,
|
|
struct buffer_head *di_bh)
|
|
{
|
|
int name_index;
|
|
char *value = NULL;
|
|
struct posix_acl *acl;
|
|
int retval;
|
|
|
|
switch (type) {
|
|
case ACL_TYPE_ACCESS:
|
|
name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
|
|
break;
|
|
case ACL_TYPE_DEFAULT:
|
|
name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
|
|
break;
|
|
default:
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
|
|
if (retval > 0) {
|
|
value = kmalloc(retval, GFP_NOFS);
|
|
if (!value)
|
|
return ERR_PTR(-ENOMEM);
|
|
retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
|
|
"", value, retval);
|
|
}
|
|
|
|
if (retval > 0)
|
|
acl = ocfs2_acl_from_xattr(value, retval);
|
|
else if (retval == -ENODATA || retval == 0)
|
|
acl = NULL;
|
|
else
|
|
acl = ERR_PTR(retval);
|
|
|
|
kfree(value);
|
|
|
|
return acl;
|
|
}
|
|
|
|
/*
|
|
* Helper function to set i_mode in memory and disk. Some call paths
|
|
* will not have di_bh or a journal handle to pass, in which case it
|
|
* will create it's own.
|
|
*/
|
|
static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh,
|
|
handle_t *handle, umode_t new_mode)
|
|
{
|
|
int ret, commit_handle = 0;
|
|
struct ocfs2_dinode *di;
|
|
|
|
if (di_bh == NULL) {
|
|
ret = ocfs2_read_inode_block(inode, &di_bh);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
} else
|
|
get_bh(di_bh);
|
|
|
|
if (handle == NULL) {
|
|
handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
|
|
OCFS2_INODE_UPDATE_CREDITS);
|
|
if (IS_ERR(handle)) {
|
|
ret = PTR_ERR(handle);
|
|
mlog_errno(ret);
|
|
goto out_brelse;
|
|
}
|
|
|
|
commit_handle = 1;
|
|
}
|
|
|
|
di = (struct ocfs2_dinode *)di_bh->b_data;
|
|
ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
inode->i_mode = new_mode;
|
|
inode_set_ctime_current(inode);
|
|
di->i_mode = cpu_to_le16(inode->i_mode);
|
|
di->i_ctime = cpu_to_le64(inode_get_ctime_sec(inode));
|
|
di->i_ctime_nsec = cpu_to_le32(inode_get_ctime_nsec(inode));
|
|
ocfs2_update_inode_fsync_trans(handle, inode, 0);
|
|
|
|
ocfs2_journal_dirty(handle, di_bh);
|
|
|
|
out_commit:
|
|
if (commit_handle)
|
|
ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
|
|
out_brelse:
|
|
brelse(di_bh);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Set the access or default ACL of an inode.
|
|
*/
|
|
static int ocfs2_set_acl(handle_t *handle,
|
|
struct inode *inode,
|
|
struct buffer_head *di_bh,
|
|
int type,
|
|
struct posix_acl *acl,
|
|
struct ocfs2_alloc_context *meta_ac,
|
|
struct ocfs2_alloc_context *data_ac)
|
|
{
|
|
int name_index;
|
|
void *value = NULL;
|
|
size_t size = 0;
|
|
int ret;
|
|
|
|
if (S_ISLNK(inode->i_mode))
|
|
return -EOPNOTSUPP;
|
|
|
|
switch (type) {
|
|
case ACL_TYPE_ACCESS:
|
|
name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
|
|
break;
|
|
case ACL_TYPE_DEFAULT:
|
|
name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
|
|
if (!S_ISDIR(inode->i_mode))
|
|
return acl ? -EACCES : 0;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (acl) {
|
|
value = ocfs2_acl_to_xattr(acl, &size);
|
|
if (IS_ERR(value))
|
|
return (int)PTR_ERR(value);
|
|
}
|
|
|
|
if (handle)
|
|
ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
|
|
"", value, size, 0,
|
|
meta_ac, data_ac);
|
|
else
|
|
ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
|
|
|
|
kfree(value);
|
|
if (!ret)
|
|
set_cached_acl(inode, type, acl);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ocfs2_iop_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
|
|
struct posix_acl *acl, int type)
|
|
{
|
|
struct buffer_head *bh = NULL;
|
|
int status, had_lock;
|
|
struct ocfs2_lock_holder oh;
|
|
struct inode *inode = d_inode(dentry);
|
|
|
|
had_lock = ocfs2_inode_lock_tracker(inode, &bh, 1, &oh);
|
|
if (had_lock < 0)
|
|
return had_lock;
|
|
if (type == ACL_TYPE_ACCESS && acl) {
|
|
umode_t mode;
|
|
|
|
status = posix_acl_update_mode(&nop_mnt_idmap, inode, &mode,
|
|
&acl);
|
|
if (status)
|
|
goto unlock;
|
|
|
|
status = ocfs2_acl_set_mode(inode, bh, NULL, mode);
|
|
if (status)
|
|
goto unlock;
|
|
}
|
|
status = ocfs2_set_acl(NULL, inode, bh, type, acl, NULL, NULL);
|
|
unlock:
|
|
ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
|
|
brelse(bh);
|
|
return status;
|
|
}
|
|
|
|
struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type, bool rcu)
|
|
{
|
|
struct ocfs2_super *osb;
|
|
struct buffer_head *di_bh = NULL;
|
|
struct posix_acl *acl;
|
|
int had_lock;
|
|
struct ocfs2_lock_holder oh;
|
|
|
|
if (rcu)
|
|
return ERR_PTR(-ECHILD);
|
|
|
|
osb = OCFS2_SB(inode->i_sb);
|
|
if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
|
|
return NULL;
|
|
|
|
had_lock = ocfs2_inode_lock_tracker(inode, &di_bh, 0, &oh);
|
|
if (had_lock < 0)
|
|
return ERR_PTR(had_lock);
|
|
|
|
down_read(&OCFS2_I(inode)->ip_xattr_sem);
|
|
acl = ocfs2_get_acl_nolock(inode, type, di_bh);
|
|
up_read(&OCFS2_I(inode)->ip_xattr_sem);
|
|
|
|
ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock);
|
|
brelse(di_bh);
|
|
return acl;
|
|
}
|
|
|
|
int ocfs2_acl_chmod(struct inode *inode, struct buffer_head *bh)
|
|
{
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
struct posix_acl *acl;
|
|
int ret;
|
|
|
|
if (S_ISLNK(inode->i_mode))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
|
|
return 0;
|
|
|
|
down_read(&OCFS2_I(inode)->ip_xattr_sem);
|
|
acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, bh);
|
|
up_read(&OCFS2_I(inode)->ip_xattr_sem);
|
|
if (IS_ERR_OR_NULL(acl))
|
|
return PTR_ERR_OR_ZERO(acl);
|
|
ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
|
|
if (ret)
|
|
return ret;
|
|
ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
|
|
acl, NULL, NULL);
|
|
posix_acl_release(acl);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Initialize the ACLs of a new inode. If parent directory has default ACL,
|
|
* then clone to new inode. Called from ocfs2_mknod.
|
|
*/
|
|
int ocfs2_init_acl(handle_t *handle,
|
|
struct inode *inode,
|
|
struct inode *dir,
|
|
struct buffer_head *di_bh,
|
|
struct buffer_head *dir_bh,
|
|
struct ocfs2_alloc_context *meta_ac,
|
|
struct ocfs2_alloc_context *data_ac)
|
|
{
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
struct posix_acl *acl = NULL;
|
|
int ret = 0, ret2;
|
|
umode_t mode;
|
|
|
|
if (!S_ISLNK(inode->i_mode)) {
|
|
if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
|
|
down_read(&OCFS2_I(dir)->ip_xattr_sem);
|
|
acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
|
|
dir_bh);
|
|
up_read(&OCFS2_I(dir)->ip_xattr_sem);
|
|
if (IS_ERR(acl))
|
|
return PTR_ERR(acl);
|
|
}
|
|
if (!acl) {
|
|
mode = inode->i_mode & ~current_umask();
|
|
ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto cleanup;
|
|
}
|
|
}
|
|
}
|
|
if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
ret = ocfs2_set_acl(handle, inode, di_bh,
|
|
ACL_TYPE_DEFAULT, acl,
|
|
meta_ac, data_ac);
|
|
if (ret)
|
|
goto cleanup;
|
|
}
|
|
mode = inode->i_mode;
|
|
ret = __posix_acl_create(&acl, GFP_NOFS, &mode);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
|
|
if (ret2) {
|
|
mlog_errno(ret2);
|
|
ret = ret2;
|
|
goto cleanup;
|
|
}
|
|
if (ret > 0) {
|
|
ret = ocfs2_set_acl(handle, inode,
|
|
di_bh, ACL_TYPE_ACCESS,
|
|
acl, meta_ac, data_ac);
|
|
}
|
|
}
|
|
cleanup:
|
|
posix_acl_release(acl);
|
|
return ret;
|
|
}
|