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sy_generic: workaround low timestamp resolution

This commit is contained in:
Thomas Schoebel-Theuer 2012-07-12 15:34:44 +02:00 committed by Thomas Schoebel-Theuer
parent 9fdc0ff41f
commit 02289207e0
1 changed files with 23 additions and 2 deletions
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25
sy_old/sy_generic.c
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@ -115,21 +115,42 @@ int mars_symlink(const char *oldpath, const char *newpath, const struct timespec
{ {
char *tmp = backskip_replace(newpath, '/', true, "/.tmp-"); char *tmp = backskip_replace(newpath, '/', true, "/.tmp-");
mm_segment_t oldfs; mm_segment_t oldfs;
struct kstat stat = {};
struct timespec new_stamp = {};
int status = -ENOMEM; int status = -ENOMEM;
if (unlikely(!tmp)) if (unlikely(!tmp))
goto done; goto done;
if (stamp)
memcpy(&new_stamp, stamp, sizeof(new_stamp));
oldfs = get_fs(); oldfs = get_fs();
set_fs(get_ds()); set_fs(get_ds());
/* Some filesystems have only full second resolution.
* Thus it may happen that the new timestamp is not
* truly moving forward when called twice shortly.
* This is a _workaround_, to be replaced by a better
* method somewhen.
*/
if (stamp) {
status = vfs_lstat((char*)newpath, &stat);
if (status >= 0 &&
!stat.mtime.tv_nsec &&
new_stamp.tv_sec <= stat.mtime.tv_sec) {
new_stamp.tv_sec = stat.mtime.tv_sec + 1;
}
}
(void)sys_unlink(tmp); (void)sys_unlink(tmp);
status = sys_symlink(oldpath, tmp); status = sys_symlink(oldpath, tmp);
if (stamp) { if (stamp) {
struct timespec times[2]; struct timespec times[2];
sys_lchown(tmp, uid, 0); sys_lchown(tmp, uid, 0);
memcpy(&times[0], stamp, sizeof(struct timespec)); memcpy(&times[0], &new_stamp, sizeof(struct timespec));
memcpy(&times[1], stamp, sizeof(struct timespec)); memcpy(&times[1], &new_stamp, sizeof(struct timespec));
status = do_utimes(AT_FDCWD, tmp, times, AT_SYMLINK_NOFOLLOW); status = do_utimes(AT_FDCWD, tmp, times, AT_SYMLINK_NOFOLLOW);
} }