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linux-next/fs/hfsplus/posix_acl.c
Christoph Hellwig 5bf3258fd2 fs: make posix_acl_chmod more useful
Rename the current posix_acl_chmod to __posix_acl_chmod and add
a fully featured ACL chmod helper that uses the ->set_acl inode
operation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-01-25 23:58:18 -05:00

275 lines
5.6 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;
acl = get_cached_acl(inode, type);
if (acl != ACL_NOT_CACHED)
return acl;
switch (type) {
case ACL_TYPE_ACCESS:
xattr_name = POSIX_ACL_XATTR_ACCESS;
break;
case ACL_TYPE_DEFAULT:
xattr_name = POSIX_ACL_XATTR_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);
if (!IS_ERR(acl))
set_cached_acl(inode, type, acl);
return acl;
}
static int hfsplus_set_posix_acl(struct inode *inode,
int type,
struct posix_acl *acl)
{
int err;
char *xattr_name;
size_t size = 0;
char *value = NULL;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
switch (type) {
case ACL_TYPE_ACCESS:
xattr_name = POSIX_ACL_XATTR_ACCESS;
if (acl) {
err = posix_acl_equiv_mode(acl, &inode->i_mode);
if (err < 0)
return err;
}
err = 0;
break;
case ACL_TYPE_DEFAULT:
xattr_name = POSIX_ACL_XATTR_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 *acl = NULL;
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;
acl = hfsplus_get_posix_acl(dir, ACL_TYPE_DEFAULT);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (acl) {
if (S_ISDIR(inode->i_mode)) {
err = hfsplus_set_posix_acl(inode,
ACL_TYPE_DEFAULT,
acl);
if (unlikely(err))
goto init_acl_cleanup;
}
err = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
if (unlikely(err < 0))
return err;
if (err > 0)
err = hfsplus_set_posix_acl(inode,
ACL_TYPE_ACCESS,
acl);
} else
inode->i_mode &= ~current_umask();
init_acl_cleanup:
posix_acl_release(acl);
return err;
}
int hfsplus_posix_acl_chmod(struct inode *inode)
{
int err;
struct posix_acl *acl;
hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
acl = hfsplus_get_posix_acl(inode, ACL_TYPE_ACCESS);
if (IS_ERR(acl) || !acl)
return PTR_ERR(acl);
err = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
if (unlikely(err))
return err;
err = hfsplus_set_posix_acl(inode, ACL_TYPE_ACCESS, acl);
posix_acl_release(acl);
return err;
}
static int hfsplus_xattr_get_posix_acl(struct dentry *dentry,
const char *name,
void *buffer,
size_t size,
int type)
{
int err = 0;
struct posix_acl *acl;
hfs_dbg(ACL_MOD,
"[%s]: ino %lu, buffer %p, size %zu, type %#x\n",
__func__, dentry->d_inode->i_ino, buffer, size, type);
if (strcmp(name, "") != 0)
return -EINVAL;
acl = hfsplus_get_posix_acl(dentry->d_inode, type);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (acl == NULL)
return -ENODATA;
err = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
posix_acl_release(acl);
return err;
}
static int hfsplus_xattr_set_posix_acl(struct dentry *dentry,
const char *name,
const void *value,
size_t size,
int flags,
int type)
{
int err = 0;
struct inode *inode = dentry->d_inode;
struct posix_acl *acl = NULL;
hfs_dbg(ACL_MOD,
"[%s]: ino %lu, value %p, size %zu, flags %#x, type %#x\n",
__func__, inode->i_ino, value, size, flags, type);
if (strcmp(name, "") != 0)
return -EINVAL;
if (!inode_owner_or_capable(inode))
return -EPERM;
if (value) {
acl = posix_acl_from_xattr(&init_user_ns, value, size);
if (IS_ERR(acl))
return PTR_ERR(acl);
else if (acl) {
err = posix_acl_valid(acl);
if (err)
goto end_xattr_set_acl;
}
}
err = hfsplus_set_posix_acl(inode, type, acl);
end_xattr_set_acl:
posix_acl_release(acl);
return err;
}
static size_t hfsplus_xattr_list_posix_acl(struct dentry *dentry,
char *list,
size_t list_size,
const char *name,
size_t name_len,
int type)
{
/*
* This method is not used.
* It is used hfsplus_listxattr() instead of generic_listxattr().
*/
return -EOPNOTSUPP;
}
const struct xattr_handler hfsplus_xattr_acl_access_handler = {
.prefix = POSIX_ACL_XATTR_ACCESS,
.flags = ACL_TYPE_ACCESS,
.list = hfsplus_xattr_list_posix_acl,
.get = hfsplus_xattr_get_posix_acl,
.set = hfsplus_xattr_set_posix_acl,
};
const struct xattr_handler hfsplus_xattr_acl_default_handler = {
.prefix = POSIX_ACL_XATTR_DEFAULT,
.flags = ACL_TYPE_DEFAULT,
.list = hfsplus_xattr_list_posix_acl,
.get = hfsplus_xattr_get_posix_acl,
.set = hfsplus_xattr_set_posix_acl,
};