/*
* Pick a file system to try mounting and
* do that in the background if necessary
*
For each location:
discard previous mount location if required
fetch next mount location
if the filesystem failed to be mounted then
this_error = error from filesystem
goto failed
if the filesystem is mounting or unmounting then
goto retry;
if the fileserver is down then
this_error = EIO
continue;
if the filesystem is already mounted
break
fi
this_error = initialize mount point
if no error on this mount and mount is delayed then
this_error = -1
fi
if this_error < 0 then
retry = true
fi
if no error on this mount then
if mount in background then
run mount in background
return -1
else
this_error = mount in foreground
fi
fi
if an error occurred on this mount then
update stats
save error in mount point
fi
endfor
*/
static int
amfs_bgmount(struct continuation *cp)
{
am_node *mp = cp->mp;
am_loc *loc;
mntfs *mf;
int this_error = -1; /* Per-mount error */
int hard_error = -1; /* Cumulative per-node error */
if (mp->am_al)
free_loc(mp->am_al);
/*
* Try to mount each location.
* At the end:
* hard_error == 0 indicates something was mounted.
* hard_error > 0 indicates everything failed with a hard error
* hard_error < 0 indicates nothing could be mounted now
*/
for (mp->am_al = *cp->al; *cp->al; cp->al++, mp->am_al = *cp->al) {
am_ops *p;
loc = dup_loc(mp->am_al);
mf = loc->al_mnt;
p = mf->mf_ops;
if (hard_error < 0)
hard_error = this_error;
this_error = 0;
if (mf->mf_error > 0) {
this_error = mf->mf_error;
goto failed;
}
if (mf->mf_flags & (MFF_MOUNTING | MFF_UNMOUNTING)) {
/*
* Still mounting - retry later
*/
dlog("mount of \"%s\" already pending", mf->mf_info);
goto retry;
}
if (FSRV_ISDOWN(mf->mf_server)) {
/*
* Would just mount from the same place
* as a hung mount - so give up
*/
dlog("%s is already hung - giving up", mf->mf_server->fs_host);
this_error = EIO;
goto failed;
}
XFREE(mp->am_link);
mp->am_link = NULL;
if (loc->al_fo && loc->al_fo->opt_sublink && loc->al_fo->opt_sublink[0])
mp->am_link = xstrdup(loc->al_fo->opt_sublink);
/*
* Will usually need to play around with the mount nodes
* file attribute structure. This must be done here.
* Try and get things initialized, even if the fileserver
* is not known to be up. In the common case this will
* progress things faster.
*/
/*
* Fill in attribute fields.
*/
if (mf->mf_fsflags & FS_DIRECTORY)
mk_fattr(&mp->am_fattr, NFDIR);
else
mk_fattr(&mp->am_fattr, NFLNK);
if (mf->mf_flags & MFF_MOUNTED) {
dlog("duplicate mount of \"%s\" ...", mf->mf_info);
/*
* Skip initial processing of the mountpoint if already mounted.
* This could happen if we have multiple sublinks into the same f/s,
* or if we are restarting an already-mounted filesystem.
*/
goto already_mounted;
}
if (mf->mf_fo && mf->mf_fo->fs_mtab) {
plog(XLOG_MAP, "Trying mount of %s on %s fstype %s mount_type %s",
mf->mf_fo->fs_mtab, mf->mf_mount, p->fs_type,
mp->am_flags & AMF_AUTOFS ? "autofs" : "non-autofs");
}
if (p->fs_init && !(mf->mf_flags & MFF_RESTART))
this_error = p->fs_init(mf);
if (this_error > 0)
goto failed;
if (this_error < 0)
goto retry;
if (loc->al_fo && loc->al_fo->opt_delay) {
/*
* If there is a delay timer on the location
* then don't try to mount if the timer
* has not expired.
*/
int i = atoi(loc->al_fo->opt_delay);
time_t now = clocktime(NULL);
if (i > 0 && now < (cp->start + i)) {
dlog("Mount of %s delayed by %lds", mf->mf_mount, (long) (i - now + cp->start));
goto retry;
}
}
/*
* If the directory is not yet made and it needs to be made, then make it!
*/
if (!(mf->mf_flags & MFF_MKMNT) && mf->mf_fsflags & FS_MKMNT) {
plog(XLOG_INFO, "creating mountpoint directory '%s'", mf->mf_mount);
this_error = mkdirs(mf->mf_mount, 0555);
if (this_error) {
plog(XLOG_ERROR, "mkdirs failed: %s", strerror(this_error));
goto failed;
}
mf->mf_flags |= MFF_MKMNT;
}
#ifdef HAVE_FS_AUTOFS
if (mf->mf_flags & MFF_IS_AUTOFS)
if ((this_error = autofs_get_fh(mp)))
goto failed;
#endif /* HAVE_FS_AUTOFS */
already_mounted:
mf->mf_flags |= MFF_MOUNTING;
if (mf->mf_fsflags & FS_MBACKGROUND) {
dlog("backgrounding mount of \"%s\"", mf->mf_mount);
if (cp->callout) {
untimeout(cp->callout);
cp->callout = 0;
}
/* actually run the task, backgrounding as necessary */
run_task(mount_node, (opaque_t) mp, amfs_cont, (opaque_t) cp);
return -1;
} else {
dlog("foreground mount of \"%s\" ...", mf->mf_mount);
this_error = mount_node((opaque_t) mp);
}
mf->mf_flags &= ~MFF_MOUNTING;
if (this_error > 0)
goto failed;
if (this_error == 0) {
am_mounted(mp);
break; /* Success */
}
retry:
if (!cp->retry)
continue;
dlog("will retry ...\n");
/*
* Arrange that amfs_bgmount is called
* after anything else happens.
*/
dlog("Arranging to retry mount of %s", mp->am_path);
sched_task(amfs_retry, (opaque_t) cp, get_mntfs_wchan(mf));
if (cp->callout)
untimeout(cp->callout);
cp->callout = timeout(RETRY_INTERVAL, wakeup,
(opaque_t) get_mntfs_wchan(mf));
mp->am_ttl = clocktime(NULL) + RETRY_INTERVAL;
/*
* Not done yet - so don't return anything
*/
return -1;
failed:
if (!FSRV_ISDOWN(mf->mf_server)) {
/* mark the mount as failed unless the server is down */
amd_stats.d_merr++;
mf->mf_error = this_error;
mf->mf_flags |= MFF_ERROR;
#ifdef HAVE_FS_AUTOFS
if (mp->am_autofs_fh)
autofs_release_fh(mp);
#endif /* HAVE_FS_AUTOFS */
if (mf->mf_flags & MFF_MKMNT) {
rmdirs(mf->mf_mount);
mf->mf_flags &= ~MFF_MKMNT;
}
}
/*
* Wakeup anything waiting for this mount
*/
wakeup(get_mntfs_wchan(mf));
free_loc(loc);
/* continue */
}
/*
* If we get here, then either the mount succeeded or
* there is no more mount information available.
*/
if (this_error) {
if (mp->am_al)
free_loc(mp->am_al);
mp->am_al = loc = new_loc();
mf = loc->al_mnt;
#ifdef HAVE_FS_AUTOFS
if (mp->am_flags & AMF_AUTOFS)
autofs_mount_failed(mp);
else
#endif /* HAVE_FS_AUTOFS */
nfs_quick_reply(mp, this_error);
if (hard_error <= 0)
hard_error = this_error;
if (hard_error < 0)
hard_error = ETIMEDOUT;
/*
* Set a small(ish) timeout on an error node if
* the error was not a time out.
*/
switch (hard_error) {
case ETIMEDOUT:
case EWOULDBLOCK:
case EIO:
mp->am_timeo = 17;
break;
default:
mp->am_timeo = 5;
break;
}
new_ttl(mp);
} else {
mf = loc->al_mnt;
/*
* Wakeup anything waiting for this mount
*/
wakeup(get_mntfs_wchan(mf));
hard_error = 0;
}
/*
* Make sure that the error value in the mntfs has a
* reasonable value.
*/
if (mf->mf_error < 0) {
mf->mf_error = hard_error;
if (hard_error)
mf->mf_flags |= MFF_ERROR;
}
/*
* In any case we don't need the continuation any more
*/
free_continuation(cp);
return hard_error;
}
/*
* Cause all the nodes to be unmounted by timing
* them out.
*/
void
umount_exported(void)
{
int i;
for (i = last_used_map; i >= 0; --i) {
am_node *mp = exported_ap[i];
mntfs *mf;
if (!mp)
continue;
mf = mp->am_mnt;
if (mf->mf_flags & MFF_UNMOUNTING) {
/*
* If this node is being unmounted then just ignore it. However,
* this could prevent amd from finishing if the unmount gets blocked
* since the am_node will never be free'd. am_unmounted needs
* telling about this possibility. - XXX
*/
continue;
}
if (!(mf->mf_fsflags & FS_DIRECTORY))
/*
* When shutting down this had better
* look like a directory, otherwise it
* can't be unmounted!
*/
mk_fattr(&mp->am_fattr, NFDIR);
if ((--immediate_abort < 0 &&
!(mp->am_flags & AMF_ROOT) && mp->am_parent) ||
(mf->mf_flags & MFF_RESTART)) {
/*
* Just throw this node away without bothering to unmount it. If
* the server is not known to be up then don't discard the mounted
* on directory or Amd might hang...
*/
if (mf->mf_server &&
(mf->mf_server->fs_flags & (FSF_DOWN | FSF_VALID)) != FSF_VALID)
mf->mf_flags &= ~MFF_MKMNT;
if (gopt.flags & CFM_UNMOUNT_ON_EXIT || mp->am_flags & AMF_AUTOFS) {
plog(XLOG_INFO, "on-exit attempt to unmount %s", mf->mf_mount);
/*
* use unmount_mp, not unmount_node, so that unmounts be
* backgrounded as needed.
*/
unmount_mp((opaque_t) mp);
} else {
am_unmounted(mp);
}
exported_ap[i] = 0;
} else {
/*
* Any other node gets forcibly timed out.
*/
mp->am_flags &= ~AMF_NOTIMEOUT;
mp->am_mnt->mf_flags &= ~MFF_RSTKEEP;
mp->am_ttl = 0;
mp->am_timeo = 1;
mp->am_timeo_w = 0;
}
}
}
