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infra: automatic timestamps in mars_symlink()

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Thomas Schoebel-Theuer 2012-12-18 05:50:04 +01:00 committed by Thomas Schoebel-Theuer
parent f7331fccf3
commit f7b5369468
1 changed files with 18 additions and 16 deletions
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34
sy_old/sy_generic.c
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@ -116,15 +116,17 @@ int mars_symlink(const char *oldpath, const char *newpath, const struct timespec
char *tmp = backskip_replace(newpath, '/', true, "/.tmp-");
mm_segment_t oldfs;
struct kstat stat = {};
struct timespec new_stamp = {};
struct timespec times[2];
int status = -ENOMEM;
if (unlikely(!tmp))
goto done;
if (stamp)
memcpy(&new_stamp, stamp, sizeof(new_stamp));
memcpy(&times[0], stamp, sizeof(times[0]));
else
get_lamport(&times[0]);
oldfs = get_fs();
set_fs(get_ds());
/* Some filesystems have only full second resolution.
@ -133,30 +135,28 @@ int mars_symlink(const char *oldpath, const char *newpath, const struct timespec
* 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) {
MARS_DBG("workaround timestamp tv_sec=%ld\n", stat.mtime.tv_sec);
new_stamp.tv_sec = stat.mtime.tv_sec + 1;
}
status = vfs_lstat((char*)newpath, &stat);
if (status >= 0 &&
!stamp &&
!stat.mtime.tv_nsec &&
times[0].tv_sec == stat.mtime.tv_sec) {
MARS_DBG("workaround timestamp tv_sec=%ld\n", stat.mtime.tv_sec);
times[0].tv_sec = stat.mtime.tv_sec + 1;
times[0].tv_nsec = 0;
}
(void)sys_unlink(tmp);
status = sys_symlink(oldpath, tmp);
if (stamp) {
struct timespec times[2];
if (status >= 0) {
sys_lchown(tmp, uid, 0);
memcpy(&times[0], &new_stamp, sizeof(struct timespec));
memcpy(&times[1], &new_stamp, sizeof(struct timespec));
memcpy(&times[1], &times[0], sizeof(struct timespec));
status = do_utimes(AT_FDCWD, tmp, times, AT_SYMLINK_NOFOLLOW);
set_lamport(&new_stamp);
}
if (status >= 0) {
set_lamport(&times[0]);
status = mars_rename(tmp, newpath);
}
set_fs(oldfs);
@ -197,6 +197,8 @@ char *mars_readlink(const char *newpath)
status = inode->i_op->readlink(path.dentry, res, 1024);
if (unlikely(status < 0)) {
MARS_ERR("cannot read link '%s', status = %d\n", newpath, status);
} else {
set_lamport(&inode->i_mtime);
}
done_put: