138 lines
2.8 KiB
C
138 lines
2.8 KiB
C
/*
|
|
* linux/fs/hfsplus/posix_acl.c
|
|
*
|
|
* Vyacheslav Dubeyko <slava@dubeyko.com>
|
|
*
|
|
* Handler for Posix Access Control Lists (ACLs) support.
|
|
*/
|
|
|
|
#include "hfsplus_fs.h"
|
|
#include "xattr.h"
|
|
#include "acl.h"
|
|
|
|
struct posix_acl *hfsplus_get_posix_acl(struct inode *inode, int type)
|
|
{
|
|
struct posix_acl *acl;
|
|
char *xattr_name;
|
|
char *value = NULL;
|
|
ssize_t size;
|
|
|
|
hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
|
|
|
|
switch (type) {
|
|
case ACL_TYPE_ACCESS:
|
|
xattr_name = XATTR_NAME_POSIX_ACL_ACCESS;
|
|
break;
|
|
case ACL_TYPE_DEFAULT:
|
|
xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT;
|
|
break;
|
|
default:
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
size = __hfsplus_getxattr(inode, xattr_name, NULL, 0);
|
|
|
|
if (size > 0) {
|
|
value = (char *)hfsplus_alloc_attr_entry();
|
|
if (unlikely(!value))
|
|
return ERR_PTR(-ENOMEM);
|
|
size = __hfsplus_getxattr(inode, xattr_name, value, size);
|
|
}
|
|
|
|
if (size > 0)
|
|
acl = posix_acl_from_xattr(&init_user_ns, value, size);
|
|
else if (size == -ENODATA)
|
|
acl = NULL;
|
|
else
|
|
acl = ERR_PTR(size);
|
|
|
|
hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
|
|
|
|
return acl;
|
|
}
|
|
|
|
int hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl,
|
|
int type)
|
|
{
|
|
int err;
|
|
char *xattr_name;
|
|
size_t size = 0;
|
|
char *value = NULL;
|
|
|
|
hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
|
|
|
|
switch (type) {
|
|
case ACL_TYPE_ACCESS:
|
|
xattr_name = XATTR_NAME_POSIX_ACL_ACCESS;
|
|
if (acl) {
|
|
err = posix_acl_update_mode(inode, &inode->i_mode, &acl);
|
|
if (err)
|
|
return err;
|
|
}
|
|
err = 0;
|
|
break;
|
|
|
|
case ACL_TYPE_DEFAULT:
|
|
xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT;
|
|
if (!S_ISDIR(inode->i_mode))
|
|
return acl ? -EACCES : 0;
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (acl) {
|
|
size = posix_acl_xattr_size(acl->a_count);
|
|
if (unlikely(size > HFSPLUS_MAX_INLINE_DATA_SIZE))
|
|
return -ENOMEM;
|
|
value = (char *)hfsplus_alloc_attr_entry();
|
|
if (unlikely(!value))
|
|
return -ENOMEM;
|
|
err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
|
|
if (unlikely(err < 0))
|
|
goto end_set_acl;
|
|
}
|
|
|
|
err = __hfsplus_setxattr(inode, xattr_name, value, size, 0);
|
|
|
|
end_set_acl:
|
|
hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
|
|
|
|
if (!err)
|
|
set_cached_acl(inode, type, acl);
|
|
|
|
return err;
|
|
}
|
|
|
|
int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir)
|
|
{
|
|
int err = 0;
|
|
struct posix_acl *default_acl, *acl;
|
|
|
|
hfs_dbg(ACL_MOD,
|
|
"[%s]: ino %lu, dir->ino %lu\n",
|
|
__func__, inode->i_ino, dir->i_ino);
|
|
|
|
if (S_ISLNK(inode->i_mode))
|
|
return 0;
|
|
|
|
err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
|
|
if (err)
|
|
return err;
|
|
|
|
if (default_acl) {
|
|
err = hfsplus_set_posix_acl(inode, default_acl,
|
|
ACL_TYPE_DEFAULT);
|
|
posix_acl_release(default_acl);
|
|
}
|
|
|
|
if (acl) {
|
|
if (!err)
|
|
err = hfsplus_set_posix_acl(inode, acl,
|
|
ACL_TYPE_ACCESS);
|
|
posix_acl_release(acl);
|
|
}
|
|
return err;
|
|
}
|