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Implement file attribute modification system calls for CloudABI.

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CloudABI uses a system call interface to modify file attributes that is
more similar to KPI's/FUSE, namely where a stat structure is passed back
to the kernel, together with a bitmask of attributes that should be
changed. This would allow us to update any set of attributes atomically.

That said, I'd rather not go as far as to actually implement it that
way, as it would require us to duplicate more code than strictly needed.
Let's just stick to the combinations that are actually used by
cloudlibc.

Obtained from:	https://github.com/NuxiNL/freebsd
This commit is contained in:
Ed Schouten 2015-07-28 12:57:19 +00:00
parent 87bf5e9212
commit 1d96fd8d9f
1 changed files with 79 additions and 4 deletions
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83
sys/compat/cloudabi/cloudabi_file.c
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@ -292,13 +292,64 @@ cloudabi_sys_file_stat_fget(struct thread *td,
return (copyout(&csb, uap->buf, sizeof(csb)));
}
/* Converts timestamps to arguments to futimens() and utimensat(). */
static void
convert_utimens_arguments(const cloudabi_filestat_t *fs,
cloudabi_fsflags_t flags, struct timespec *ts)
{
if ((flags & CLOUDABI_FILESTAT_ATIM_NOW) != 0) {
ts[0].tv_nsec = UTIME_NOW;
} else if ((flags & CLOUDABI_FILESTAT_ATIM) != 0) {
ts[0].tv_sec = fs->st_atim / 1000000000;
ts[0].tv_nsec = fs->st_atim % 1000000000;
} else {
ts[0].tv_nsec = UTIME_OMIT;
}
if ((flags & CLOUDABI_FILESTAT_MTIM_NOW) != 0) {
ts[1].tv_nsec = UTIME_NOW;
} else if ((flags & CLOUDABI_FILESTAT_MTIM) != 0) {
ts[1].tv_sec = fs->st_mtim / 1000000000;
ts[1].tv_nsec = fs->st_mtim % 1000000000;
} else {
ts[1].tv_nsec = UTIME_OMIT;
}
}
int
cloudabi_sys_file_stat_fput(struct thread *td,
struct cloudabi_sys_file_stat_fput_args *uap)
{
cloudabi_filestat_t fs;
struct timespec ts[2];
int error;
/* Not implemented. */
return (ENOSYS);
error = copyin(uap->buf, &fs, sizeof(fs));
if (error != 0)
return (error);
/*
* Only support truncation and timestamp modification separately
* for now, to prevent unnecessary code duplication.
*/
if ((uap->flags & CLOUDABI_FILESTAT_SIZE) != 0) {
/* Call into kern_ftruncate() for file truncation. */
if ((uap->flags & ~CLOUDABI_FILESTAT_SIZE) != 0)
return (EINVAL);
return (kern_ftruncate(td, uap->fd, fs.st_size));
} else if ((uap->flags & (CLOUDABI_FILESTAT_ATIM |
CLOUDABI_FILESTAT_ATIM_NOW | CLOUDABI_FILESTAT_MTIM |
CLOUDABI_FILESTAT_MTIM_NOW)) != 0) {
/* Call into kern_futimens() for timestamp modification. */
if ((uap->flags & ~(CLOUDABI_FILESTAT_ATIM |
CLOUDABI_FILESTAT_ATIM_NOW | CLOUDABI_FILESTAT_MTIM |
CLOUDABI_FILESTAT_MTIM_NOW)) != 0)
return (EINVAL);
convert_utimens_arguments(&fs, uap->flags, ts);
return (kern_futimens(td, uap->fd, ts, UIO_SYSSPACE));
}
return (EINVAL);
}
int
@ -347,9 +398,33 @@ int
cloudabi_sys_file_stat_put(struct thread *td,
struct cloudabi_sys_file_stat_put_args *uap)
{
cloudabi_filestat_t fs;
struct timespec ts[2];
char *path;
int error;
/* Not implemented. */
return (ENOSYS);
/*
* Only support timestamp modification for now, as there is no
* truncateat().
*/
if ((uap->flags & ~(CLOUDABI_FILESTAT_ATIM |
CLOUDABI_FILESTAT_ATIM_NOW | CLOUDABI_FILESTAT_MTIM |
CLOUDABI_FILESTAT_MTIM_NOW)) != 0)
return (EINVAL);
error = copyin(uap->buf, &fs, sizeof(fs));
if (error != 0)
return (error);
error = copyin_path(uap->path, uap->pathlen, &path);
if (error != 0)
return (error);
convert_utimens_arguments(&fs, uap->flags, ts);
error = kern_utimensat(td, uap->fd, path, UIO_SYSSPACE, ts,
UIO_SYSSPACE, (uap->fd & CLOUDABI_LOOKUP_SYMLINK_FOLLOW) != 0 ?
0 : AT_SYMLINK_NOFOLLOW);
cloudabi_freestr(path);
return (error);
}
int