/*
* Ideally the mounted aufs should be unmounted even if its mntpnt has very long
* pathname. In other words, if umount.aufs cannot handle a long pathname, then
* mount.aufs should reject in the beginning.
* getmntent(3) in glibc reads 4096 bytes for a single mnt entry. I agree it is
* large enough. And mount(8) rejects too long pathname. It is OK too. As long
* as 4095 (4096 - 1) bytes pathname succeeds mounting, then it should be
* unmounted flawlessly.
* Testing on Debian v7 (wheezy) succeeded mounting 4095 bytes pathname, but
* failed unmounting. I don't like this unbalancing. So replace getmntent() by
* getmntent_r() with larger buffer. Obviously this is less important since such
* long pathname is very rare.
*/
int au_proc_getmntent(char *mntpnt, struct mntent *rent)
{
int found;
struct mntent *p, e;
FILE *fp;
char a[4096 + 1024], path[PATH_MAX], *decoded;
decoded = au_decode_mntpnt(mntpnt, path, sizeof(path));
if (!decoded)
AuFin("au_decode_mntpnt");
fp = setmntent(ProcMounts, "r");
if (!fp)
AuFin(ProcMounts);
/* find the last one */
memset(rent, 0, sizeof(*rent));
found = 0;
while ((p = getmntent_r(fp, &e, a, sizeof(a))))
if (!strcmp(p->mnt_dir, decoded)) {
Dpri("%s, %s, %s, %s, %d, %d\n",
p->mnt_fsname, p->mnt_dir, p->mnt_type,
p->mnt_opts, p->mnt_freq, p->mnt_passno);
copy_ent(rent, p);
found = 1;
}
endmntent(fp);
if (!found) {
errno = EINVAL;
AuFin("%s, %s", mntpnt, decoded);
}
return 0;
}
int au_proc_getmntent(char *mntpnt, struct mntent *rent)
{
int found;
struct mntent *p;
FILE *fp;
fp = setmntent(ProcMounts, "r");
if (!fp)
AuFin(ProcMounts);
/* find the last one */
memset(rent, 0, sizeof(*rent));
found = 0;
while ((p = getmntent(fp)))
if (!strcmp(p->mnt_dir, mntpnt)) {
Dpri("%s, %s, %s, %s, %d, %d\n",
p->mnt_fsname, p->mnt_dir, p->mnt_type,
p->mnt_opts, p->mnt_freq, p->mnt_passno);
copy_ent(rent, p);
found = 1;
}
endmntent(fp);
if (!found) {
errno = EINVAL;
AuFin("%s", mntpnt);
}
return 0;
}
