mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 08:02:30 +00:00
7c1a000d46
Remove the verbose license text from f2fs files and replace them with SPDX tags. This does not change the license of any of the code. Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
410 lines
8.9 KiB
C
410 lines
8.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* fs/f2fs/acl.c
|
|
*
|
|
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
|
|
* http://www.samsung.com/
|
|
*
|
|
* Portions of this code from linux/fs/ext2/acl.c
|
|
*
|
|
* Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
|
|
*/
|
|
#include <linux/f2fs_fs.h>
|
|
#include "f2fs.h"
|
|
#include "xattr.h"
|
|
#include "acl.h"
|
|
|
|
static inline size_t f2fs_acl_size(int count)
|
|
{
|
|
if (count <= 4) {
|
|
return sizeof(struct f2fs_acl_header) +
|
|
count * sizeof(struct f2fs_acl_entry_short);
|
|
} else {
|
|
return sizeof(struct f2fs_acl_header) +
|
|
4 * sizeof(struct f2fs_acl_entry_short) +
|
|
(count - 4) * sizeof(struct f2fs_acl_entry);
|
|
}
|
|
}
|
|
|
|
static inline int f2fs_acl_count(size_t size)
|
|
{
|
|
ssize_t s;
|
|
size -= sizeof(struct f2fs_acl_header);
|
|
s = size - 4 * sizeof(struct f2fs_acl_entry_short);
|
|
if (s < 0) {
|
|
if (size % sizeof(struct f2fs_acl_entry_short))
|
|
return -1;
|
|
return size / sizeof(struct f2fs_acl_entry_short);
|
|
} else {
|
|
if (s % sizeof(struct f2fs_acl_entry))
|
|
return -1;
|
|
return s / sizeof(struct f2fs_acl_entry) + 4;
|
|
}
|
|
}
|
|
|
|
static struct posix_acl *f2fs_acl_from_disk(const char *value, size_t size)
|
|
{
|
|
int i, count;
|
|
struct posix_acl *acl;
|
|
struct f2fs_acl_header *hdr = (struct f2fs_acl_header *)value;
|
|
struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1);
|
|
const char *end = value + size;
|
|
|
|
if (size < sizeof(struct f2fs_acl_header))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
count = f2fs_acl_count(size);
|
|
if (count < 0)
|
|
return ERR_PTR(-EINVAL);
|
|
if (count == 0)
|
|
return NULL;
|
|
|
|
acl = posix_acl_alloc(count, GFP_NOFS);
|
|
if (!acl)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
for (i = 0; i < count; i++) {
|
|
|
|
if ((char *)entry > end)
|
|
goto fail;
|
|
|
|
acl->a_entries[i].e_tag = le16_to_cpu(entry->e_tag);
|
|
acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm);
|
|
|
|
switch (acl->a_entries[i].e_tag) {
|
|
case ACL_USER_OBJ:
|
|
case ACL_GROUP_OBJ:
|
|
case ACL_MASK:
|
|
case ACL_OTHER:
|
|
entry = (struct f2fs_acl_entry *)((char *)entry +
|
|
sizeof(struct f2fs_acl_entry_short));
|
|
break;
|
|
|
|
case ACL_USER:
|
|
acl->a_entries[i].e_uid =
|
|
make_kuid(&init_user_ns,
|
|
le32_to_cpu(entry->e_id));
|
|
entry = (struct f2fs_acl_entry *)((char *)entry +
|
|
sizeof(struct f2fs_acl_entry));
|
|
break;
|
|
case ACL_GROUP:
|
|
acl->a_entries[i].e_gid =
|
|
make_kgid(&init_user_ns,
|
|
le32_to_cpu(entry->e_id));
|
|
entry = (struct f2fs_acl_entry *)((char *)entry +
|
|
sizeof(struct f2fs_acl_entry));
|
|
break;
|
|
default:
|
|
goto fail;
|
|
}
|
|
}
|
|
if ((char *)entry != end)
|
|
goto fail;
|
|
return acl;
|
|
fail:
|
|
posix_acl_release(acl);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static void *f2fs_acl_to_disk(struct f2fs_sb_info *sbi,
|
|
const struct posix_acl *acl, size_t *size)
|
|
{
|
|
struct f2fs_acl_header *f2fs_acl;
|
|
struct f2fs_acl_entry *entry;
|
|
int i;
|
|
|
|
f2fs_acl = f2fs_kmalloc(sbi, sizeof(struct f2fs_acl_header) +
|
|
acl->a_count * sizeof(struct f2fs_acl_entry),
|
|
GFP_NOFS);
|
|
if (!f2fs_acl)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION);
|
|
entry = (struct f2fs_acl_entry *)(f2fs_acl + 1);
|
|
|
|
for (i = 0; i < acl->a_count; i++) {
|
|
|
|
entry->e_tag = cpu_to_le16(acl->a_entries[i].e_tag);
|
|
entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm);
|
|
|
|
switch (acl->a_entries[i].e_tag) {
|
|
case ACL_USER:
|
|
entry->e_id = cpu_to_le32(
|
|
from_kuid(&init_user_ns,
|
|
acl->a_entries[i].e_uid));
|
|
entry = (struct f2fs_acl_entry *)((char *)entry +
|
|
sizeof(struct f2fs_acl_entry));
|
|
break;
|
|
case ACL_GROUP:
|
|
entry->e_id = cpu_to_le32(
|
|
from_kgid(&init_user_ns,
|
|
acl->a_entries[i].e_gid));
|
|
entry = (struct f2fs_acl_entry *)((char *)entry +
|
|
sizeof(struct f2fs_acl_entry));
|
|
break;
|
|
case ACL_USER_OBJ:
|
|
case ACL_GROUP_OBJ:
|
|
case ACL_MASK:
|
|
case ACL_OTHER:
|
|
entry = (struct f2fs_acl_entry *)((char *)entry +
|
|
sizeof(struct f2fs_acl_entry_short));
|
|
break;
|
|
default:
|
|
goto fail;
|
|
}
|
|
}
|
|
*size = f2fs_acl_size(acl->a_count);
|
|
return (void *)f2fs_acl;
|
|
|
|
fail:
|
|
kfree(f2fs_acl);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static struct posix_acl *__f2fs_get_acl(struct inode *inode, int type,
|
|
struct page *dpage)
|
|
{
|
|
int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
|
|
void *value = NULL;
|
|
struct posix_acl *acl;
|
|
int retval;
|
|
|
|
if (type == ACL_TYPE_ACCESS)
|
|
name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
|
|
|
|
retval = f2fs_getxattr(inode, name_index, "", NULL, 0, dpage);
|
|
if (retval > 0) {
|
|
value = f2fs_kmalloc(F2FS_I_SB(inode), retval, GFP_F2FS_ZERO);
|
|
if (!value)
|
|
return ERR_PTR(-ENOMEM);
|
|
retval = f2fs_getxattr(inode, name_index, "", value,
|
|
retval, dpage);
|
|
}
|
|
|
|
if (retval > 0)
|
|
acl = f2fs_acl_from_disk(value, retval);
|
|
else if (retval == -ENODATA)
|
|
acl = NULL;
|
|
else
|
|
acl = ERR_PTR(retval);
|
|
kfree(value);
|
|
|
|
return acl;
|
|
}
|
|
|
|
struct posix_acl *f2fs_get_acl(struct inode *inode, int type)
|
|
{
|
|
return __f2fs_get_acl(inode, type, NULL);
|
|
}
|
|
|
|
static int __f2fs_set_acl(struct inode *inode, int type,
|
|
struct posix_acl *acl, struct page *ipage)
|
|
{
|
|
int name_index;
|
|
void *value = NULL;
|
|
size_t size = 0;
|
|
int error;
|
|
umode_t mode = inode->i_mode;
|
|
|
|
switch (type) {
|
|
case ACL_TYPE_ACCESS:
|
|
name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
|
|
if (acl && !ipage) {
|
|
error = posix_acl_update_mode(inode, &mode, &acl);
|
|
if (error)
|
|
return error;
|
|
set_acl_inode(inode, mode);
|
|
}
|
|
break;
|
|
|
|
case ACL_TYPE_DEFAULT:
|
|
name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
|
|
if (!S_ISDIR(inode->i_mode))
|
|
return acl ? -EACCES : 0;
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (acl) {
|
|
value = f2fs_acl_to_disk(F2FS_I_SB(inode), acl, &size);
|
|
if (IS_ERR(value)) {
|
|
clear_inode_flag(inode, FI_ACL_MODE);
|
|
return PTR_ERR(value);
|
|
}
|
|
}
|
|
|
|
error = f2fs_setxattr(inode, name_index, "", value, size, ipage, 0);
|
|
|
|
kfree(value);
|
|
if (!error)
|
|
set_cached_acl(inode, type, acl);
|
|
|
|
clear_inode_flag(inode, FI_ACL_MODE);
|
|
return error;
|
|
}
|
|
|
|
int f2fs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
|
|
{
|
|
if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
|
|
return -EIO;
|
|
|
|
return __f2fs_set_acl(inode, type, acl, NULL);
|
|
}
|
|
|
|
/*
|
|
* Most part of f2fs_acl_clone, f2fs_acl_create_masq, f2fs_acl_create
|
|
* are copied from posix_acl.c
|
|
*/
|
|
static struct posix_acl *f2fs_acl_clone(const struct posix_acl *acl,
|
|
gfp_t flags)
|
|
{
|
|
struct posix_acl *clone = NULL;
|
|
|
|
if (acl) {
|
|
int size = sizeof(struct posix_acl) + acl->a_count *
|
|
sizeof(struct posix_acl_entry);
|
|
clone = kmemdup(acl, size, flags);
|
|
if (clone)
|
|
refcount_set(&clone->a_refcount, 1);
|
|
}
|
|
return clone;
|
|
}
|
|
|
|
static int f2fs_acl_create_masq(struct posix_acl *acl, umode_t *mode_p)
|
|
{
|
|
struct posix_acl_entry *pa, *pe;
|
|
struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL;
|
|
umode_t mode = *mode_p;
|
|
int not_equiv = 0;
|
|
|
|
/* assert(atomic_read(acl->a_refcount) == 1); */
|
|
|
|
FOREACH_ACL_ENTRY(pa, acl, pe) {
|
|
switch(pa->e_tag) {
|
|
case ACL_USER_OBJ:
|
|
pa->e_perm &= (mode >> 6) | ~S_IRWXO;
|
|
mode &= (pa->e_perm << 6) | ~S_IRWXU;
|
|
break;
|
|
|
|
case ACL_USER:
|
|
case ACL_GROUP:
|
|
not_equiv = 1;
|
|
break;
|
|
|
|
case ACL_GROUP_OBJ:
|
|
group_obj = pa;
|
|
break;
|
|
|
|
case ACL_OTHER:
|
|
pa->e_perm &= mode | ~S_IRWXO;
|
|
mode &= pa->e_perm | ~S_IRWXO;
|
|
break;
|
|
|
|
case ACL_MASK:
|
|
mask_obj = pa;
|
|
not_equiv = 1;
|
|
break;
|
|
|
|
default:
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
if (mask_obj) {
|
|
mask_obj->e_perm &= (mode >> 3) | ~S_IRWXO;
|
|
mode &= (mask_obj->e_perm << 3) | ~S_IRWXG;
|
|
} else {
|
|
if (!group_obj)
|
|
return -EIO;
|
|
group_obj->e_perm &= (mode >> 3) | ~S_IRWXO;
|
|
mode &= (group_obj->e_perm << 3) | ~S_IRWXG;
|
|
}
|
|
|
|
*mode_p = (*mode_p & ~S_IRWXUGO) | mode;
|
|
return not_equiv;
|
|
}
|
|
|
|
static int f2fs_acl_create(struct inode *dir, umode_t *mode,
|
|
struct posix_acl **default_acl, struct posix_acl **acl,
|
|
struct page *dpage)
|
|
{
|
|
struct posix_acl *p;
|
|
struct posix_acl *clone;
|
|
int ret;
|
|
|
|
*acl = NULL;
|
|
*default_acl = NULL;
|
|
|
|
if (S_ISLNK(*mode) || !IS_POSIXACL(dir))
|
|
return 0;
|
|
|
|
p = __f2fs_get_acl(dir, ACL_TYPE_DEFAULT, dpage);
|
|
if (!p || p == ERR_PTR(-EOPNOTSUPP)) {
|
|
*mode &= ~current_umask();
|
|
return 0;
|
|
}
|
|
if (IS_ERR(p))
|
|
return PTR_ERR(p);
|
|
|
|
clone = f2fs_acl_clone(p, GFP_NOFS);
|
|
if (!clone)
|
|
goto no_mem;
|
|
|
|
ret = f2fs_acl_create_masq(clone, mode);
|
|
if (ret < 0)
|
|
goto no_mem_clone;
|
|
|
|
if (ret == 0)
|
|
posix_acl_release(clone);
|
|
else
|
|
*acl = clone;
|
|
|
|
if (!S_ISDIR(*mode))
|
|
posix_acl_release(p);
|
|
else
|
|
*default_acl = p;
|
|
|
|
return 0;
|
|
|
|
no_mem_clone:
|
|
posix_acl_release(clone);
|
|
no_mem:
|
|
posix_acl_release(p);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
int f2fs_init_acl(struct inode *inode, struct inode *dir, struct page *ipage,
|
|
struct page *dpage)
|
|
{
|
|
struct posix_acl *default_acl = NULL, *acl = NULL;
|
|
int error = 0;
|
|
|
|
error = f2fs_acl_create(dir, &inode->i_mode, &default_acl, &acl, dpage);
|
|
if (error)
|
|
return error;
|
|
|
|
f2fs_mark_inode_dirty_sync(inode, true);
|
|
|
|
if (default_acl) {
|
|
error = __f2fs_set_acl(inode, ACL_TYPE_DEFAULT, default_acl,
|
|
ipage);
|
|
posix_acl_release(default_acl);
|
|
} else {
|
|
inode->i_default_acl = NULL;
|
|
}
|
|
if (acl) {
|
|
if (!error)
|
|
error = __f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl,
|
|
ipage);
|
|
posix_acl_release(acl);
|
|
} else {
|
|
inode->i_acl = NULL;
|
|
}
|
|
|
|
return error;
|
|
}
|