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mergerfs/src/fs_utimensat_generic.hpp
Antonio SJ Musumeci 538467b86d config: rework global config, remove rwlock, make branches RCU like 
Also added unit tests. Should have done separately but found a number of bugs.
2021-01-14 21:02:10 -05:00

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/*
ISC License
Copyright (c) 2020, Antonio SJ Musumeci <trapexit@spawn.link>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "fs_fstat.hpp"
#include "fs_fstatat.hpp"
#include "fs_futimesat.hpp"
#include "fs_lutimens.hpp"
#include "fs_stat_utils.hpp"
#include <string>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/time.h>
#ifndef UTIME_NOW
# define UTIME_NOW ((1l << 30) - 1l)
#endif
#ifndef UTIME_OMIT
# define UTIME_OMIT ((1l << 30) - 2l)
#endif
namespace l
{
static
inline
bool
can_call_lutimes(const int dirfd_,
const std::string &path_,
const int flags_)
{
return ((flags_ == AT_SYMLINK_NOFOLLOW) &&
((dirfd_ == AT_FDCWD) ||
(path_[0] == '/')));
}
static
inline
bool
should_ignore(const struct timespec ts_[2])
{
return ((ts_ != NULL) &&
(ts_[0].tv_nsec == UTIME_OMIT) &&
(ts_[1].tv_nsec == UTIME_OMIT));
}
static
inline
bool
should_be_set_to_now(const struct timespec ts_[2])
{
return ((ts_ == NULL) ||
((ts_[0].tv_nsec == UTIME_NOW) &&
(ts_[1].tv_nsec == UTIME_NOW)));
}
static
inline
bool
timespec_invalid(const struct timespec &ts_)
{
return (((ts_.tv_nsec < 0) ||
(ts_.tv_nsec > 999999999)) &&
((ts_.tv_nsec != UTIME_NOW) &&
(ts_.tv_nsec != UTIME_OMIT)));
}
static
inline
bool
timespec_invalid(const struct timespec ts_[2])
{
return ((ts_ != NULL) &&
(l::timespec_invalid(ts_[0]) ||
l::timespec_invalid(ts_[1])));
}
static
inline
bool
flags_invalid(const int flags_)
{
return ((flags_ & ~AT_SYMLINK_NOFOLLOW) != 0);
}
static
inline
bool
any_timespec_is_utime_omit(const struct timespec ts_[2])
{
return ((ts_[0].tv_nsec == UTIME_OMIT) ||
(ts_[1].tv_nsec == UTIME_OMIT));
}
static
inline
bool
any_timespec_is_utime_now(const struct timespec ts_[2])
{
return ((ts_[0].tv_nsec == UTIME_NOW) ||
(ts_[1].tv_nsec == UTIME_NOW));
}
static
inline
int
set_utime_omit_to_current_value(const int dirfd_,
const std::string &path_,
const struct timespec ts_[2],
struct timeval tv_[2],
const int flags_)
{
int rv;
struct stat st;
timespec *atime;
timespec *mtime;
if(!l::any_timespec_is_utime_omit(ts_))
return 0;
rv = fs::fstatat(dirfd_,path_,&st,flags_);
if(rv == -1)
return -1;
atime = fs::stat_atime(st);
mtime = fs::stat_mtime(st);
if(ts_[0].tv_nsec == UTIME_OMIT)
TIMESPEC_TO_TIMEVAL(&tv[0],atime);
if(ts_[1].tv_nsec == UTIME_OMIT)
TIMESPEC_TO_TIMEVAL(&tv[1],mtime);
return 0;
}
static
inline
int
set_utime_omit_to_current_value(const int fd_,
const struct timespec ts_[2],
struct timeval tv_[2])
{
int rv;
struct stat st;
timespec *atime;
timespec *mtime;
if(!l::any_timespec_is_utime_omit(ts_))
return 0;
rv = fs::fstat(fd_,&st);
if(rv == -1)
return -1;
atime = fs::stat_atime(st);
mtime = fs::stat_mtime(st);
if(ts_[0].tv_nsec == UTIME_OMIT)
TIMESPEC_TO_TIMEVAL(&tv_[0],atime);
if(ts_[1].tv_nsec == UTIME_OMIT)
TIMESPEC_TO_TIMEVAL(&tv_[1],mtime);
return 0;
}
static
inline
int
set_utime_now_to_now(const struct timespec ts_[2],
struct timeval tv_[2])
{
int rv;
struct timeval now;
if(l::any_timespec_is_utime_now(ts_))
return 0;
rv = time::gettimeofday(&now,NULL);
if(rv == -1)
return -1;
if(ts_[0].tv_nsec == UTIME_NOW)
tv_[0] = now;
if(ts_[1].tv_nsec == UTIME_NOW)
tv_[1] = now;
return 0;
}
static
inline
int
convert_timespec_to_timeval(const int dirfd_,
const std::string &path_,
const struct timespec ts_[2],
struct timeval tv_[2],
struct timeval **tvp_,
const int flags_)
{
int rv;
if(l::should_be_set_to_now(ts_))
return (tvp=NULL,0);
TIMESPEC_TO_TIMEVAL(&tv_[0],&ts_[0]);
TIMESPEC_TO_TIMEVAL(&tv_[1],&ts_[1]);
rv = l::set_utime_omit_to_current_value(dirfd_,path_,ts_,tv_,flags_);
if(rv == -1)
return -1;
rv = l::set_utime_now_to_now(ts_,tv_);
if(rv == -1)
return -1;
return (*tvp_=tv_,0);
}
static
inline
int
convert_timespec_to_timeval(const int fd_,
const struct timespec ts_[2],
struct timeval tv_[2],
struct timeval **tvp_)
{
int rv;
if(l::should_be_set_to_now(ts_))
return (*tvp=NULL,0);
TIMESPEC_TO_TIMEVAL(&tv_[0],&ts_[0]);
TIMESPEC_TO_TIMEVAL(&tv_[1],&ts_[1]);
rv = l::set_utime_omit_to_current_value(fd_,ts_,tv_);
if(rv == -1)
return -1;
rv = l::set_utime_now_to_now(ts_,tv_);
if(rv == -1)
return -1;
return (*tvp=tv,0);
}
}
namespace fs
{
static
inline
int
utimensat(const int dirfd_,
const std::string &path_,
const struct timespec ts_[2],
const int flags_)
{
int rv;
struct timeval tv[2];
struct timeval *tvp;
if(l::flags_invalid(flags))
return (errno=EINVAL,-1);
if(l::timespec_invalid(ts_))
return (errno=EINVAL,-1);
if(l::should_ignore(ts_))
return 0;
rv = l::convert_timespec_to_timeval(dirfd_,path_,ts_,tv,&tvp,flags_);
if(rv == -1)
return -1;
if((flags_ & AT_SYMLINK_NOFOLLOW) == 0)
return fs::futimesat(dirfd_,path_,tvp);
if(l::can_call_lutimes(dirfd_,path_,flags))
return fs::lutimes(path_,tvp);
return (errno=ENOTSUP,-1);
}
}
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