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/*
* FUSE: Filesystem in Userspace
* Copyright (C) 2001-2016 Miklos Szeredi <miklos@szeredi.hu>
*
* This program can be distributed under the terms of the GNU GPL.
* See the file COPYING.
*/
#include "fuse_i.h"
#include <linux/xattr.h>
#include <linux/posix_acl_xattr.h>
int fuse_setxattr(struct inode *inode, const char *name, const void *value,
size_t size, int flags, unsigned int extra_flags)
{
struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
struct fuse_setxattr_in inarg;
int err;
if (fm->fc->no_setxattr)
return -EOPNOTSUPP;
memset(&inarg, 0, sizeof(inarg));
inarg.size = size;
inarg.flags = flags;
inarg.setxattr_flags = extra_flags;
args.opcode = FUSE_SETXATTR;
args.nodeid = get_node_id(inode);
args.in_numargs = 3;
args.in_args[0].size = fm->fc->setxattr_ext ?
sizeof(inarg) : FUSE_COMPAT_SETXATTR_IN_SIZE;
args.in_args[0].value = &inarg;
args.in_args[1].size = strlen(name) + 1;
args.in_args[1].value = name;
args.in_args[2].size = size;
args.in_args[2].value = value;
err = fuse_simple_request(fm, &args);
if (err == -ENOSYS) {
fm->fc->no_setxattr = 1;
err = -EOPNOTSUPP;
}
if (!err)
fuse_update_ctime(inode);
return err;
}
ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
size_t size)
{
struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
struct fuse_getxattr_in inarg;
struct fuse_getxattr_out outarg;
ssize_t ret;
if (fm->fc->no_getxattr)
return -EOPNOTSUPP;
memset(&inarg, 0, sizeof(inarg));
inarg.size = size;
args.opcode = FUSE_GETXATTR;
args.nodeid = get_node_id(inode);
args.in_numargs = 2;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
args.in_args[1].size = strlen(name) + 1;
args.in_args[1].value = name;
/* This is really two different operations rolled into one */
args.out_numargs = 1;
if (size) {
args.out_argvar = true;
args.out_args[0].size = size;
args.out_args[0].value = value;
} else {
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
}
ret = fuse_simple_request(fm, &args);
if (!ret && !size)
ret = min_t(ssize_t, outarg.size, XATTR_SIZE_MAX);
if (ret == -ENOSYS) {
fm->fc->no_getxattr = 1;
ret = -EOPNOTSUPP;
}
return ret;
}
static int fuse_verify_xattr_list(char *list, size_t size)
{
size_t origsize = size;
while (size) {
size_t thislen = strnlen(list, size);
if (!thislen || thislen == size)
return -EIO;
size -= thislen + 1;
list += thislen + 1;
}
return origsize;
}
ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
{
struct inode *inode = d_inode(entry);
struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
struct fuse_getxattr_in inarg;
struct fuse_getxattr_out outarg;
ssize_t ret;
if (fuse_is_bad(inode))
return -EIO;
if (!fuse_allow_current_process(fm->fc))
return -EACCES;
if (fm->fc->no_listxattr)
return -EOPNOTSUPP;
memset(&inarg, 0, sizeof(inarg));
inarg.size = size;
args.opcode = FUSE_LISTXATTR;
args.nodeid = get_node_id(inode);
args.in_numargs = 1;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
/* This is really two different operations rolled into one */
args.out_numargs = 1;
if (size) {
args.out_argvar = true;
args.out_args[0].size = size;
args.out_args[0].value = list;
} else {
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
}
ret = fuse_simple_request(fm, &args);
if (!ret && !size)
ret = min_t(ssize_t, outarg.size, XATTR_LIST_MAX);
if (ret > 0 && size)
ret = fuse_verify_xattr_list(list, ret);
if (ret == -ENOSYS) {
fm->fc->no_listxattr = 1;
ret = -EOPNOTSUPP;
}
return ret;
}
int fuse_removexattr(struct inode *inode, const char *name)
{
struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
int err;
if (fm->fc->no_removexattr)
return -EOPNOTSUPP;
args.opcode = FUSE_REMOVEXATTR;
args.nodeid = get_node_id(inode);
args.in_numargs = 1;
args.in_args[0].size = strlen(name) + 1;
args.in_args[0].value = name;
err = fuse_simple_request(fm, &args);
if (err == -ENOSYS) {
fm->fc->no_removexattr = 1;
err = -EOPNOTSUPP;
}
if (!err)
fuse_update_ctime(inode);
return err;
}
static int fuse_xattr_get(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, void *value, size_t size)
{
if (fuse_is_bad(inode))
return -EIO;
return fuse_getxattr(inode, name, value, size);
}
static int fuse_xattr_set(const struct xattr_handler *handler,
struct mnt_idmap *idmap,
struct dentry *dentry, struct inode *inode,
const char *name, const void *value, size_t size,
int flags)
{
if (fuse_is_bad(inode))
return -EIO;
if (!value)
return fuse_removexattr(inode, name);
return fuse_setxattr(inode, name, value, size, flags, 0);
}
static const struct xattr_handler fuse_xattr_handler = {
.prefix = "",
.get = fuse_xattr_get,
.set = fuse_xattr_set,
};
const struct xattr_handler * const fuse_xattr_handlers[] = {
&fuse_xattr_handler,
NULL
};
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